Relevant bibliographies by topics / Cretaceous ecosystem

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Academic literature on the topic 'Cretaceous ecosystem'

Author: Grafiati
Published: 7 June 2025
Last updated: 16 July 2025

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Journal articles on the topic "Cretaceous ecosystem"

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Wilson, Lauren N., Daniel T. Ksepka, John P. Wilson, et al. "Arctic bird nesting traces back to the Cretaceous." Science 388, no. 6750 (2025): 974–78. https://doi.org/10.1126/science.adt5189.

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Polar ecosystems are structured and enriched by birds, which nest there seasonally and serve as keystone ecosystem members. Despite the ecological importance of polar birds, the origins of high-latitude nesting strategies remain obscured by a sparse fossil record. We report an extreme-latitude Arctic avialan assemblage from the Prince Creek Formation of Alaska—the northernmost Late Cretaceous terrestrial ecosystem. Numerous three-dimensionally preserved fossils constitute one of the most taxonomically rich Late Cretaceous avialan assemblages, including members of Hesperornithes, Ichthyornithes, and near-crown or crown birds (Neornithes), recording a previously undocumented interval in avialan evolution. Abundant perinatal fossils represent the oldest evidence of birds nesting at polar latitudes, which demonstrates that birds began using seasonal polar environments for breeding during the Cretaceous, long before their modern descendants.
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Zhou, Zhonghe, Paul M. Barrett, and Jason Hilton. "An exceptionally preserved Lower Cretaceous ecosystem." Nature 421, no. 6925 (2003): 807–14. http://dx.doi.org/10.1038/nature01420.

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Vellekoop, Johan, Lineke Woelders, Appy Sluijs, Kenneth G. Miller, and Robert P. Speijer. "Phytoplankton community disruption caused by latest Cretaceous global warming." Biogeosciences 16, no. 21 (2019): 4201–10. http://dx.doi.org/10.5194/bg-16-4201-2019.

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Abstract. Phytoplankton responses to a ∼350 kyr (kiloyear) long phase of gradual late Maastrichtian (latest Cretaceous) global warming starting at ∼66.4 Ma can provide valuable insights into the long-term influences of global change on marine ecosystems. Here we perform micropaleontological analyses on three cores from the New Jersey paleoshelf to assess the response of phytoplankton using cyst-forming dinoflagellates and benthic ecosystems using benthic foraminifera. Our records show that this latest Maastrichtian warming event (LMWE), characterized by a 4.0±1.3 ∘C warming of sea surface waters on the New Jersey paleoshelf, resulted in a succession of nearly monospecific dinoflagellate-cyst assemblages, dominated by the species Palynodinium grallator. This response, likely triggered by the combination of warmer and seasonally thermally stratified seas, appears to have been more intense at offshore sites than at nearshore sites. The LMWE, and related dinoflagellate response, is associated with an impoverished benthic ecosystem. A wider geographic survey of literature data reveals that the dominance of P. grallator is a marker for the LMWE throughout the northern midlatitudes. While the dinocyst assemblage returned to a stable, normal marine community in the last tens of thousands of years of the Maastrichtian, benthic foraminiferal diversity appears to have remained slightly suppressed. Increased ecosystem stress during the latest Maastrichtian potentially primed global ecosystems for the subsequent mass extinction following the Cretaceous Paleogene (K–Pg) boundary Chicxulub impact.
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Suarez, Celina A., Joseph Frederickson, Richard L. Cifelli, et al. "A new vertebrate fauna from the Lower Cretaceous Holly Creek Formation of the Trinity Group, southwest Arkansas, USA." PeerJ 9 (October 21, 2021): e12242. http://dx.doi.org/10.7717/peerj.12242.

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We present a previously discovered but undescribed late Early Cretaceous vertebrate fauna from the Holly Creek Formation of the Trinity Group in Arkansas. The site from the ancient Gulf Coast is dominated by semi-aquatic forms and preserves a diverse aquatic, semi-aquatic, and terrestrial fauna. Fishes include fresh- to brackish-water chondrichthyans and a variety of actinopterygians, including semionotids, an amiid, and a new pycnodontiform, Anomoeodus caddoi sp. nov. Semi-aquatic taxa include lissamphibians, the solemydid turtle Naomichelys, a trionychid turtle, and coelognathosuchian crocodyliforms. Among terrestrial forms are several members of Dinosauria and one or more squamates, one of which, Sciroseps pawhuskai gen. et sp. nov., is described herein. Among Dinosauria, both large and small theropods (Acrocanthosaurus, Deinonychus, and Richardoestesia) and titanosauriform sauropods are represented; herein we also report the first occurrence of a nodosaurid ankylosaur from the Trinity Group. The fauna of the Holly Creek Formation is similar to other, widely scattered late Early Cretaceous assemblages across North America and suggests the presence of a low-diversity, broadly distributed continental ecosystem of the Early Cretaceous following the Late Jurassic faunal turnover. This low-diversity ecosystem contrasts sharply with the highly diverse ecosystem which emerged by the Cenomanian. The contrast underpins the importance of vicariance as an evolutionary driver brought on by Sevier tectonics and climatic changes, such as rising sea level and formation of the Western Interior Seaway, impacting the early Late Cretaceous ecosystem.
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Henehan, Michael J., Pincelli M. Hull, Donald E. Penman, James W. B. Rae, and Daniela N. Schmidt. "Biogeochemical significance of pelagic ecosystem function: an end-Cretaceous case study." Philosophical Transactions of the Royal Society B: Biological Sciences 371, no. 1694 (2016): 20150510. http://dx.doi.org/10.1098/rstb.2015.0510.

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Pelagic ecosystem function is integral to global biogeochemical cycling, and plays a major role in modulating atmospheric CO 2 concentrations ( p CO 2 ). Uncertainty as to the effects of human activities on marine ecosystem function hinders projection of future atmospheric p CO 2 . To this end, events in the geological past can provide informative case studies in the response of ecosystem function to environmental and ecological changes. Around the Cretaceous–Palaeogene (K–Pg) boundary, two such events occurred: Deccan large igneous province (LIP) eruptions and massive bolide impact at the Yucatan Peninsula. Both perturbed the environment, but only the impact coincided with marine mass extinction. As such, we use these events to directly contrast the response of marine biogeochemical cycling to environmental perturbation with and without changes in global species richness. We measure this biogeochemical response using records of deep-sea carbonate preservation. We find that Late Cretaceous Deccan volcanism prompted transient deep-sea carbonate dissolution of a larger magnitude and timescale than predicted by geochemical models. Even so, the effect of volcanism on carbonate preservation was slight compared with bolide impact. Empirical records and geochemical models support a pronounced increase in carbonate saturation state for more than 500 000 years following the mass extinction of pelagic carbonate producers at the K–Pg boundary. These examples highlight the importance of pelagic ecosystems in moderating climate and ocean chemistry.
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Baranov, Viktor A., Yinan Wang, Rok Gašparič, Sonja Wedmann, and Joachim T. Haug. "Eco-morphological diversity of larvae of soldier flies and their closest relatives in deep time." PeerJ 8 (November 27, 2020): e10356. http://dx.doi.org/10.7717/peerj.10356.

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Stratiomyomorpha (soldier flies and allies) is an ingroup of Diptera, with a fossil record stretching back to the Early Cretaceous (the Barremian, about 125 MYA). Stratiomyomorpha includes at least 3,000 species in the modern fauna, with many species being crucial for ecosystem functions, especially as saprophages. Larvae of many stratiomyomorphans are especially important as scavengers and saproxyls in modern ecosystems. Yet, fossil larvae of the group are extremely scarce. Here we present 23 new records of fossil stratiomyomorphan larvae, representing six discrete morphotypes. Specimens originate from Cretaceous amber from Myanmar, Eocene Baltic amber, Miocene Dominican amber, and compression fossils from the Eocene of Messel (Germany) and the Miocene of Slovenia. We discuss the implications of these new records for our understanding of stratiomyomorphan ecomorphology in deep time as well as their palaeoecology.
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Carvalho, Mónica R., Carlos Jaramillo, Felipe de la Parra, et al. "Extinction at the end-Cretaceous and the origin of modern Neotropical rainforests." Science 372, no. 6537 (2021): 63–68. http://dx.doi.org/10.1126/science.abf1969.

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The end-Cretaceous event was catastrophic for terrestrial communities worldwide, yet its long-lasting effect on tropical forests remains largely unknown. We quantified plant extinction and ecological change in tropical forests resulting from the end-Cretaceous event using fossil pollen (>50,000 occurrences) and leaves (>6000 specimens) from localities in Colombia. Late Cretaceous (Maastrichtian) rainforests were characterized by an open canopy and diverse plant–insect interactions. Plant diversity declined by 45% at the Cretaceous–Paleogene boundary and did not recover for ~6 million years. Paleocene forests resembled modern Neotropical rainforests, with a closed canopy and multistratal structure dominated by angiosperms. The end-Cretaceous event triggered a long interval of low plant diversity in the Neotropics and the evolutionary assembly of today’s most diverse terrestrial ecosystem.
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Jacobs, Louis, Michael Polcyn, Octávio Mateus, and Anne Schulp. "Deep Time Conservation Paleobiology of the Atlantic Jigsaw Puzzle and the Future of the Southwestern Angolan Coast." Bulletin of the Florida Museum of Natural History 60, no. 2 (2023): 90. http://dx.doi.org/10.58782/flmnh.fior9961.

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The puzzle-like fit of Africa and South America reflects the tectonically driven opening of the South Atlantic Ocean beginning over 130 mya. By 90 Ma, the North and South Atlantics were conjoined. The introduction of Cretaceous marine reptiles into the central South Atlantic from the north coincides with through-flow in the Equatorial Atlantic Gateway and with increased productivity and upwelling of the Benguela Current. The K-Pg extinction saw the demise of most marine reptiles, but upwelling apparently persisted, evidenced by a growing Cenozoic fossil record of sea turtles and marine mammals from the Angolan coast. Convergent similarities between the Cretaceous marine reptile vertebrate community and the modern vertebrate community of the Benguela Large Marine Ecosystem suggest essentially continuous productivity related to upwelling along the southwest African coast since Cretaceous time. Paleolatitude reconstructions show that predicted positions of coastal upwelling of the Benguela Current have moved south along the coast as Africa drifted northward through the descending limb of the southern Hadley Cell. The Cretaceous and modern faunas were both adapted to a productive upwelling zone. The Cretaceous relict Welwitschia mirabilis is consistent with coastal aridity alongside upwelling. Thus, the sediments of coastal Angola and the fossils they entomb are relevant to conservation paleobiology because they provide a baseline through deep time. Comparisons underscore the resilience of the Benguela Current on the one hand and emphasize human-driven threats to the Benguela Large Marine Ecosystem on the other. Solutions are being sought; for instance, through the evaluation of Ecologically or Biologically Significant Marine Areas (EBSA) in the Benguela Current Large Marine Ecosystem. In Angola, the geologic record of the opening of the South Atlantic, the fossils, public interest, and the value for sustainable development are positive indications for the future.
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WANG, QIANG, XIAOLIN WANG, ZIKUI ZHAO, JIALIANG ZHANG, and SHUNXING JIANG. "New turtle egg fossil from the Upper Cretaceous of the Laiyang Basin, Shandong Province, China." Anais da Academia Brasileira de Ciências 85, no. 1 (2013): 103–11. http://dx.doi.org/10.1590/s0001-37652013000100008.

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A new type of turtle egg fossil was established: Emydoolithus laiyangensis oogen. et oosp. nov.. Based on its elliptical morphological shape, rigid eggshells, and eggshell characteristics, it is different from other types of round chelonian egg fossils. It is the second chelonian egg fossil found in Cretaceous in China. This discovery shows the Laiyang ecosystem in Late Cretaceous is more diversified than previously thought.
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Brownstein, Chase D. "Trace fossils on dinosaur bones reveal ecosystem dynamics along the coast of eastern North America during the latest Cretaceous." PeerJ 6 (June 11, 2018): e4973. http://dx.doi.org/10.7717/peerj.4973.

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Direct evidence of paleoecological processes is often rare when the fossil record is poor, as in the case of the Cretaceous of eastern North America. Here, I describe a femur and partial tibia shaft assignable to theropods from two Late Cretaceous sites in New Jersey. The former, identifiable as the femur of a large ornithomimosaur, bears several scores interpreted as shark feeding traces. The tibia shaft has punctures and flaked bone from the bites of mid-sized crocodyliforms, the first documented occurrence of crocodyliform traces on dinosaur bone from the Maastrichtian of the Atlantic Coastal Plain. The surface of the partial tibia is also littered with indentations interpreted as the traces of invertebrates, revealing a microcosm of biological interaction on the coastal seafloor of the Cretaceous Atlantic Ocean. Massive crocodyliforms, such as Deinosuchus rugosus and the slightly smaller Deltasuchus motherali, maintained the role of terrestrial vertebrate taphonomic process drivers in eastern North America during the Cretaceous. The report of crocodyliform bite marks on the ornithomimosaur tibia shaft in this manuscript reinforces the importance of the role of crocodyliforms in the modification of terrestrial vertebrate remains during the Cretaceous in North America. The preserved invertebrate traces add to the sparse record of the presence of barnacles and other marine invertebrates on dinosaur bone, and the evidence of shark feeding on the ornithomimosaur femur support the “bloat-and-float” model of terrestrial vertebrate fossil deposition in marine deposits from the Cretaceous of eastern North America.
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Dissertations / Theses on the topic "Cretaceous ecosystem"

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Rozada, Lee. "Taphonomie de l'assemblage de macrorestes fossiles de vertébrés du Lagerstätte d'Angeac-Charente (Crétacé inférieur, Charente, France)." Thesis, Paris, Muséum national d'histoire naturelle, 2019. http://www.theses.fr/2019MNHN0006.

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Les opportunités de reconstituer l’écologie et les comportements d’individus et d’espèces de vertébrés éteints sont rares. Plusieurs grands assemblages de vertébrés fossiles datant de la fin du Jurassique au début du Crétacé fournissent des informations sur la biodiversité et les communautés de vertébrés terrestres. Cependant, à l’exception du Lagerstätte de Las Hoyas (Crétacé inférieur, Espagne), les fossiles de ces assemblages ont été retrouvés sur un large éventail géographique, stratigraphique et/ou temporel. Cette thèse présente les résultats d’une étude taphonomique, couplée avec des données néotaphonomiques, paléontologiques, ichnologiques, sédimentologiques et géochimiques, de l’assemblage de macrorestes fossiles de vertébrés du site du Crétacé inférieur d’Angeac-Charente, situé dans l’Ouest de la France. Neuf campagnes de fouilles menées depuis 2010 ont permis de récolter plusieurs milliers de macrorestes de vertébrés appartenant à 16 taxons différents, auxquels viennent s’ajouter d’abondants microrestes appartenant à 27 taxons de vertébrés supplémentaires, plusieurs centaines de coprolithes de termites et de vertébrés riches en inclusions végétales et osseuses, des centaines de remplissages naturels d’empreintes de dinosaures, de nombreux restes de végétaux, des moules de mollusques bivalves et gastropodes, ainsi que des ostracodes. L’ensemble sédimentaire est dominé par des argiles de décantation interrompues par des dépôts localisés de plus haute énergie (cours d’eau, inondation) déposé dans un environnement de zone humide de type marécage. De nombreuses figures de déformations synsédimentaires formées en milieu liquide sont conservées sous forme de « scènes figées ». Des empreintes attribuées à l’ichnogenre Deltapodus et conservées sous forme de remplissages de dépôt direct ont été produites par un groupe multigénérationnel de stégosaures. De nombreuses empreintes de sauropodes sont conservées en 3-D ou en 4-D sous forme de remplissages de profondeurs variables. L’assemblage osseux est multitaxique, très diversifié et comprend des taxons terrestres, amphibies et aquatiques d’eau douce. Il contient une combinaison de macrofossiles et microfossiles et s’est formé de manière complexe, avec l’intervention de multiples processus d’origine biologique, écologique et physique. Il est dominé par les dinosaures, en particulier une nouvelle espèce d’ornithomimosaure non-ornithomimidé, dont de nombreux restent résultent d’une mort en masse d’un troupeau multigénérationnel dominé par des juvéniles et subadultes. D’abondants restes de sauropodes ont été transportés sur une plus ou moins grande distance avant d’être déposés sur le site. De nombreuses traces de morsure à la surface des restes de carapaces appartenant à plusieurs individus de tortues Pleurosternon bullockii résultent du comportement de prédation du crocodylomorphe Goniopholis, avec l’utilisation de la technique « casse-noix ». Les modifications osseuses post-dépositionnelles, comme la désarticulation, les déplacements, réorientations, fractures et traces de surface, résultent principalement de l’intense piétinement par les dinosaures. Le Lagerstätte d’Angeac-Charente ouvre une fenêtre d’une résolution spatiale et temporelle exceptionnellement fine sur un écosystème terrestre ouest-européen du tout début du Crétacé dont les organismes étaient en interaction directe entre eux et avec leur environnement<br>Opportunities to reconstruct the ecology and behaviour of individuals of extinct vertebrate species are rare. Several large assemblages of fossil vertebrate dating from the late Jurassic to the early Cretaceous provide information on biodiversity and terrestrial vertebrate communities. However, with the exception of the Lagerstätte of Las Hoyas (Lower Cretaceous, Spain), the fossils of these assemblages have been found over a wide geographical, stratigraphic and/or temporal range. This PhD thesis presents the results of a taphonomic study, coupled with neotaphonic, paleontological, ichnological, sedimentological and geochemical data, of the assemblage of vertebrate fossils macro-remains from the Lower Cretaceous site of Angeac-Charente, located in the western France. Nine excavation campaigns carried out since 2010 allowed to collect thousands of vertebrate macroremains belonging to 16 different taxa, to which are added abundant microremains belonging to 27 additional vertebrate taxa, hundreds of termite and vertebrate coprolites rich in plant and bone inclusions, hundreds of natural casts of dinosaur tracks, numerous plant remains, bivalve and gastropod casts, as well as ostracods. The sedimentary assemblage is dominated by settling clays interrupted by localized deposits of higher energy deposited in a swampy wetland environment. Many synsedimentary deformations formed in liquefied sediments are preserved as "frozen scenes". Tracks attributed to the ichnogenre Deltapodus and preserved as direct deposit infills were produced by a multigenerational group of stegosaurs. Many sauropod footprints of various depths are stored in 3-D or 4-D. The bone assemblage is multitaxic, highly diversified and includes terrestrial as well as freshwater amphibian and aquatic taxa. It contains a combination of macrofossils and microfossils and has been formed in a complex way, with the intervention of multiple processes of biological, ecological and physical origin. It is dominated by dinosaurs, especially a new species of non-ornithomimid ornithomimosaur, many of whom remain resulting from a catastrophic mass death of a multigenerational herd dominated by juveniles and subadults. Abundant sauropod remains were transported by water currents over various distance before their deposit on the site. Many bite marks on the surface of shell remains belonging to several Pleurosternon bullockii turtle individuals result from the predatory behaviour of the crocodylomorph Goniopholis, with the use of the "nutcracker" technique. Post-depositional bone modifications, such as disarticulation, displacements, reorientations, fractures, fissures and surface marks, result mainly from intense trampling by dinosaurs. The Angeac-Charente Lagerstätte opens a window of exceptionally fine spatial and temporal resolution on a western European terrestrial ecosystem from the very beginning of the Cretaceous whose organisms interacted directly with each other and with their environment
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Hull, Pincelli Marie. "Macroevolutionary patterns in planktonic foraminifera and the recovery of Pelagic Ecosystems from the Cretaceous-Paleogene mass extinction." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p3398253.

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Thesis (Ph. D.)--University of California, San Diego, 2010.<br>Title from first page of PDF file (viewed May 6, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
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Blanco, Calvo Alejandro. "Vertebrate microfossil diversity from the Tremp Formation (Maastrichtian): Contributions to evolution of the Late Cretaceous terrestrial ecosystems from the northeastern Iberian Peninsula." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/401778.

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La presente tesis doctoral trata sobre la diversidad de los pequeños y medianos vertebrados en los últimos ecosistemas del Cretácico Superior (Maastrichtiense) representados en el registro fósil de la Formación Tremp (Cataluña, España). Los microfósiles estudiados pertenecen a los grupos de los condrictios, osteíctios, anfibios, escamosos y cocodrilomorfos. En cuanto a peces, los resultados muestran una baja diversidad de condrictios, pero una rica asociación de osteíctios que además representa un buen ejemplo de la diversificación de los teleósteos durante el final del Cretácico. Por otra parte, el registro fósil de cypriniformes y osteoglossiformes son los más antiguos a nivel mundial y europeo respectivamente. Los resultados también revelan una diversa asociación de anfibios y reptiles escamosos, entre los cuales los restos de gecónidos son la única evidencia de este grupo en el registro mesozoico de la Península Ibérica y una de las pocas a nivel europeo. El registro fósil de cocodrilomorfos está compuesto principalmente por dientes aislados pertenecientes a diversos clados de cocodrilos notosuquios, neosuquios y eusuquios. Además, se han descrito dos especies nuevas del género Allodaposuchus en base a dos esqueletos parciales. Estas dos especies han sido relevantes para conocer los restos postcraneales de este grupo extinto de cocodrilos, y han permitido proponer nuevas hipótesis sobre la diversidad ecológica de los allodaposúquidos así como de la historia evolutiva de los cocodrilos actuales. A parte de las aportaciones taxonómicas y sistemáticas, los microfósiles de vertebrados estudiados han permitido entender mejor la paleoecología de los ambientes acuáticos y continentales del Maastrichtiense ibérico, así como el origen y relación biogeográfica de los vertebrados que componían estas faunas maastrichtienses. Estos nuevos datos contribuyen a reconstruir los ecosistemas del noreste ibérico durante el final del Cretácico y entender su dinámica y evolución hasta el momento de la extinción masiva del límite Cretácico-Paleógeno.<br>A presente tese doutoral trata da diversidade dos pequenos e medianos vertebrados nos derradeiros ecosistemas do Cretáceo Superior (Maastrichtiense) representados no rexistro fósil da Formación Tremp (Cataluña, España). Os microfósiles estudados pertencen ós grupos dos condrictios, osteíctios, anfibios, escamados e crocodilomorfos. No concernente ós peixes, os resultados mostran unha baixa diversidade de condrictios, pero unha rica asociación de osteictios que ademais reflexa un bo exemplo da diversificación dos teleósteos durante o final do Cretáceo. Pola outra banda, o rexistro fósil dos cypriniformes e osteoglossiformes son os máis antigos a niveis mundial e europeo respectivamente. Os resultados tamén sinalan unha diversa asociación de anfibios e réptiles escamados, entre os cales os restos de xecónidos son a única evidencia deste grupo no rexistro mesozoico da Península Ibérica e unha das poucas a nivel europeo. O rexistro fósil dos crocodilomorfos está composto maiormente por dentes illados pertencentes a diversos clados de crocodilos notosuquios, neosuquios e eusuquios. Ademais describíronse dúas novas especies do xénero Allodaposuchus a partires de dous esqueletos parciais. Estas dúas especies foron relevantes pra coñece-los restos post-craniais deste grupo extinto de crocodilos, e permitiron propor novas hipóteses sobre a diversidade ecolóxica dos allodaposúquidos, así como da historia evolutiva dos crocodilos actuais. A maiores das contribucións taxonómicas e sistemáticas, os microfósiles de vertebrados estudados permitiron mellora-lo coñecemento da paleoecoloxía dos ambientes acuáticos e continentais do Maastrichtiense ibérico, así coma do orixe e relación bioxeográfica dos vertebrados que compuxeran estas faunas maastrichtienses. Estes novos datos contribúen a reconstruí-los ecosistemas do nordeste ibérico durante o final do Cretáceo e entende-la súa dinámica e evolución ata o momento da extinción masiva do límite Cretáceo-Paleóxeno.<br>The present PhD dissertation deals on the diversity of the small- and medium-sized vertebrates from the latest ecosystems of the Late Cretaceous (Maastrichtian) represented in the fossil record of the Tremp Formation (Catalonia, Spain). The studied microfossils belong to chondrichthyan, osteichthyan, amphibian, squamate and crocodilian groups. Regarding fishes, the results show a low diversity of chondrichthyans, but a diverse assemblage of osteichthyans representing a good example of the teleost diversification during the end of the Cretaceous. Likewise, the fossil remains referred to osteoglossiforms and cypriniforms are the oldest evidence for these groups in Europe and in the world, respectively. The results of this thesis also point to a diverse assemblage of amphibians and squamates, among which the gekkotan fossil is the only occurrence of this group in the Mesozoic record of the Iberian Peninsula, and one of the little evidence in Europe. The fossil record of crocodylomorphs is mainly composed of shed teeth from different notosuchian, neosuchian and eusuchian clades. Moreover, two new species of the genus Allodaposuchus were erected based on two partial skeletons. These two specimens have been relevant to know the postcranial bones of this extinct crocodilian group. These species have also allowed us to propose new hypotheses about the ecological diversity of allodaposuchids and the evolutionary history of living crocodiles. Besides of systematics and taxonomic contributions, the study of the fossil microvertebrates has enabled us to assess the palaeoecology of the aquatic and continental environments from the Maastrichtian of the Iberian Peninsula, as well as the origin and biogeographical relationships of the Maastrichtian vertebrate faunas. These new data are contributing to reconstruct the ecosystems from the northeastern Iberian plate during the end of the Cretaceous; and to understand the dynamics and evolution until the massive extinction event in the Cretaceous-Palaeogene boundary.
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Redman, Cory. "Utilizing Vertebrates to Understand the Factors that Influence Terrestrial Ecosystem Structure." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10778.

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Conserving biodiversity in the current global ecological crisis requires a robust understanding of a multitude of abiotic and biotic processes operating at spatial and temporal scales that are nearly impossible to study on a human timescale and are therefore poorly understood. However, fossil data preserve a vast archive of information on past ecosystems and how they have changed through time. My PhD research is composed of three studies that look at biogeogaphic distribution, ecosystem structure, and trends in richness and diversity. Identifying organisms to the species level is a common practice in ecology when conducting community analyses. However, when species-level identification is not feasible, higher level taxonomic identifications are used as surrogates. This study tests the validity of supraspecific identifications for vertebrates in regional biogeography studies, using the recorded occurrences of terrestrial and aquatic taxa from 16 national parks on the Colorado Plateau and culling the data set based on a series of taphonomic processes to generated fossil assemblages. Changes in community structure as a result of increased magnitude and/or frequency of perturbations have been well documented in terrestrial and marine ecosystems. Unfortunately, the long-term effects of sea-level rise on vertebrate communities in coastal habitats are poorly understood and difficult to study on a human time scale. This study examines the long term effects of relative sea-level change on coastal plain ecosystems of the Belly River Group (Campanian) in southern Alberta using microvertebrate fossils. Most Cretaceous freshwater deposits in North America produce only a couple of articulated fish skeletons. Because of this preservational bias many workers suggested that freshwater teleosts were largely absent from North America until the Eocene or later. Late Cretaceous fish assemblages are of particular interest, because these assemblages undergo a major compositional change. Pre-Cretaceous fish assemblages are dominated by non-teleosts, while Paleogene assemblages are dominated by teleosts that are members of extant families. This study provides a first approach in characterizing long-term trends in richness and the distribution of Late Cretaceous, nonmarine actinopterygians of the Western Interior of North America.
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Books on the topic "Cretaceous ecosystem"

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Godefroit, Pascal. Bernissart Dinosaurs and Early Cretaceous Terrestrial Ecosystems. Indiana University Press, 2012.

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Bernissart dinosaurs and early Cretaceous terrestrial ecosystems. Indiana University Press, 2012.

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Book chapters on the topic "Cretaceous ecosystem"

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Labandeira, Conrad C., Francisco J. Rodríguez-Tovar, and Alfred Uchman. "The End-Cretaceous Extinction and Ecosystem Change." In Topics in Geobiology. Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-9597-5_5.

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Mendes, Márcio, Francisco Irineudo Bezerra, and Karen Adami. "Ecosystem Structure and Trophic Network in the Late Early Cretaceous Crato Biome." In Brazilian Paleofloras. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-319-90913-4_33-1.

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Mendes, Márcio, Francisco Irineudo Bezerra, and Karen Adami-Rodrigues. "Ecosystem Structure and Trophic Network in the Late Early Cretaceous Crato Biome." In Brazilian Paleofloras. Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-030-22526-1_33.

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Johnson, Claudia C., and Erle G. Kauffman. "Cretaceous Evolution of Reef Ecosystems." In Topics in Geobiology. Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1219-6_9.

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de la Horra, Raúl, M. Belén Muñoz-García, Marian Fregenal-Martínez, and Javier Elez. "Palaeoenvironmental Interpretation of Palaeosols and Palustrine Carbonates of the Earliest Cretaceous Terrestrial Ecosystems in the Serranía de Cuenca, Iberian Ranges, Spain." In Springer Geology. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_228.

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King, David T., Lucille W. Petruny, and Thornton L. Neathery. "Ecosystem perturbation caused by a small Late Cretaceous marine impact, Gulf Coastal Plain, USA." In Large Ecosystem Perturbations: Causes and Consequences. Geological Society of America, 2007. http://dx.doi.org/10.1130/2007.2424(06).

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Newman, M. E. J., and R. G. Palmer. "Extinction In The Fossil Record." In Modeling Extinction. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195159455.003.0006.

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Of the estimated one to four billion species that have existed on the Earth since life first appeared here (Simpson 1952), less than 50 million are still alive today (May 1990). All the others became extinct, typically within about ten million years (My) of their first appearance. It is clearly a question of some interest what the causes are of this high turnover, and much research has been devoted to the topic (see, for example, Raup (1991a) and Glen (1994) and references therein). Most of this work has focussed on the causes of extinction of individual species, or on the causes of identifiable mass extinction events, such as the end-Cretaceous event. However, a recent body of work has examined instead the statistical features of the history of extinction, using mathematical models of extinction processes and comparing their predictions with global properties of the fossil record. In this book we will study these models, describing their mathematical basis, the extinction mechanisms that they incorporate, and their predictions. Before we start looking at the models however, we need to learn something about the trends in fossil and other data which they attempt to model. This is the topic of this introductory chapter. Those well versed in the large-scale patterns seen in the Phanerozoic fossil record may wish to skip or merely browse this chapter, passing on to chapter 2, where the discussion of the models begins. There are two primary colleges of thought about the causes of extinction. The traditional view, still held by most palaeontologists as well as many in other disciplines, is that extinction is the result of external stresses imposed on the ecosystem by the environment (Benton 1991; Hoffmann and Parsons 1991; Parsons 1993). There are indeed excellent arguments in favor of this viewpoint, since we have good evidence for particular exogenous causes for a number of major extinction events in the Earth's history, such as marine regression (sealevel drop) for the late-Permian event (Jablonski 1985; Hallam 1989), and bolide impact for the end-Cretaceous (Alvarez et al. 1980; Alvarez 1983, 1987).
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Scott, Andrew C. "Fire, Flowers, and Dinosaurs." In Burning Planet. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198734840.003.0008.

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The Mesozoic Era is the geological interval comprising the Triassic, Jurassic, and Cretaceous Periods, and it is best known for the rise and fall of the dinosaurs. The Mesozoic began around 250 million years ago and continued to around 66 million years ago—a not inconsiderable chunk of geological time, and framed by mass extinctions at its beginning and end. Fifty years ago there were very few published papers on fire in deep time, but the most important one, which I’ve touched on before, was ‘Forest fire in the Mesozoic’, by Tom Harris of the University of Reading. Tom was an important scientist, one of the leading palaeobotanists in the world. Energetic and passionate about his fossil plants, he was a scientist with broad interests, and given to experimentation and lateral thinking. The evidence that Tom used in his paper on fires in the Mesozoic was limited to only a couple of charcoal occurrences in these rocks. The Permian Period ended with the biggest known mass extinction in Earth history, when life was almost wiped out. Whole ecosystems collapsed. So what would the world have looked like at the start of the Triassic? Among whole groups of plants that had become extinct were the giant club mosses that had been the major coal-forming plants of the late Paleozoic, and the glossopterids that had dominated southern continental vegetation. In the first few million years after the extinctions, plant diversity appears to have been low, but some new plants became prominent, including the pole-like spore-bearing lycopod called Pleuromeia, and the scrambling seedplant called Dicroidium, which had fern-like foliage. The first 10 million years of the Triassic are thought to have been a time of ecosystem recovery. According to Berner’s model, the Triassic started with very low levels of oxygen in the atmosphere. Researchers had noticed that there were no coals found at the beginning of the Triassic, and this interval was called the ‘coal gap’. The problem, therefore, was that charcoal in coal could not be used as a proxy for atmospheric oxygen for this time interval.
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GÖTZ, STEFAN. "Inside Rudist Ecosystems: Growth, Reproduction, and Population Dynamics." In Cretaceous Rudists and Carbonate Platforms: Environmental Feedback. SEPM (Society for Sedimentary Geology), 2007. http://dx.doi.org/10.2110/pec.07.87.0097.

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Morris, S. Conway. "The evolution of diversity in ancient ecosystems: a review." In Evolution of Biological Diversity. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198503057.003.0014.

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Abstract It is John Phillips (1860) who is generally credited with first plotting a history of diversity as revealed by the fossil record (Figure 14.1, upper left). Although schematic his diagram has several features of interest. It depicts the triple peaks of Palaeozoic, Mesozoic and Cainozoic diversity, divided by the caesuras of the end Permian and end-Cretaceous events. Interestingly, the respective dips in the highs of Paleozoic and Mesozoic diversity were attributed to techonomic failure, a problem that still dogs any analysis of ancient diversity. Phillips (1860) also recognized the precipitous increase in Cainozoic diversity. Thus, within a year of the first edition of Darwin ‘s Origin of Speciesthe basic information on the history of organic diversity was available, with Phillips (1860) not only drawing attention to techonomic lacunae but also in the pages preceding his figure 4 making some preliminary attempts to quantify his analysis. It took more than a hundred years, however, for serious interest in this history to be rekindled. First were the pioneering formulations of Newell (1967), Valentine (1969, 1973) and Tappan (1969), but the subsequent enterprise has been strongly influenced by the massive compilations, in part unpublished, by Sepkoski (1992) (Figure 14.1) and an important series of analytical papers (Sepkoski 1978, 1979, 1981, 1988, 1993; see also Sepkoski 1997).
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Conference papers on the topic "Cretaceous ecosystem"

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Rosenberg, Y. O., S. Ashckenazi-Polivoda, S. Chin, et al. "Collapse and Recovery of an Upwelling-Productive-Ecosystem Across the Cretaceous-Paleogene Mass Extinction." In 29th International Meeting on Organic Geochemistry. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902749.

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Diaz-Tarmayo, J., L. Schwark, J. Galloway, and M. Bringué. "Late Cretaceous Arctic Wildfires and Ecosystem Dynamics Reconstructed from Biomarkers in Nearshore Marine Sediments." In IMOG 2023. European Association of Geoscientists & Engineers, 2023. http://dx.doi.org/10.3997/2214-4609.202333235.

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Fiorillo, Anthony R., Paul J. McCarthy, Grant Shimer, et al. "A PERSPECTIVE ON THE MID-CRETACEOUS FROM A DINOSAURIAN HIGH LATITUDE GREENHOUSE ECOSYSTEM, NORTH SLOPE, ALASKA." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-334633.

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Jones, Heather L., Jessica H. Whiteside, Ursula Roehl, et al. "THE ROLE OF THE MARINE BIOLOGICAL PUMP IN DRIVING ECOSYSTEM RECOVERY FOLLOWING THE CRETACEOUS-PALEOGENE (K-PG) MASS EXTINCTION EVENT." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-358244.

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Flynn, Andrew G., Ross Secord, Jie Geng, et al. "EARLY PALEOCENE FLORAS FROM THE SAN JUAN BASIN (NEW MEXICO, USA) RECORD TERRESTRIAL ECOSYSTEM CHANGE FOLLOWING THE CRETACEOUS-PALEOGENE BOUNDARY." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-359350.

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Flynn, Andrew G., Daniel J. Peppe, Thomas E. Williamson, Ross Secord, Stephen L. Brusatte, and Jie Geng. "EARLY PALEOCENE PLANT AND MAMMALIAN COMMUNITIES FROM THE SAN JUAN BASIN (NEW MEXICO, USA) RECORD LONG TERM ECOSYSTEM INSTABILITY FOLLOWING THE CRETACEOUS-PALEOGENE BOUNDARY." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340708.

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Brophy, Shannon K., Matthew P. Garb, Neil H. Landman, et al. "BIOTIC RESPONSE TO A LATE CRETACEOUS ASH FALL: COMPARATIVE FAUNAL ANALYSES FROM A METHANE SEEP AND NON-SEEP ECOSYSTEM WITHIN THE WESTERN INTERIOR SEAWAY." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-324111.

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Flynn, Andrew, Daniel J. Peppe, Brittany Abbuhl, and Thomas E. Williamson. "EARLY PALEOCENE PLANT COMMUNITIES FROM THE LOWER NACIMIENTO FORMATION (SAN JUAN BASIN, NEW MEXICO, USA) DOCUMENT RELATIVELY LONG-TERM ECOSYSTEM INSTABILITY FOLLOWING THE CRETACEOUS-PALEOGENE EXTINCTION EVENT." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284618.

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Rollet, Nadege, John Vizy, Catherine Norton, et al. "Revised Jurassic and Cretaceous stratigraphic correlations across the Great Artesian Basin: Improving hydrogeological conceptualisations." In Central Australian Basins Symposium IV. PESA, 2024. http://dx.doi.org/10.36404/saau4811.

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The Great Artesian Basin (GAB) is the largest groundwater basin in Australia, underlying approximately one fifth of the continent, including parts of Queensland, New South Wales, South Australia and the Northern Territory. The GAB consists of four hydraulically connected geological basins – Eromanga, Surat, Carpentaria and Clarence-Moreton, which contain a sedimentary assemblage deposited almost continuously from Early Jurassic to Late Cretaceous. Groundwater from the GAB is a vital resource for agricultural, extractive industries and community water supplies. It supports cultural values and sustains groundwater-dependent ecosystems such as springs and wetlands.
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Taylor, Ian, Richard Lupia, and Caitlin A. Hodges. "MODELING NET PRIMARY PRODUCTIVITY IN ANCIENT TERRESTRIAL ECOSYSTEMS: INVESTIGATIONS INTO THE CRETACEOUS CRITICAL ZONE." In GSA Connects 2024 Meeting in Anaheim, California. Geological Society of America, 2024. http://dx.doi.org/10.1130/abs/2024am-400979.

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Reports on the topic "Cretaceous ecosystem"

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Capps, Denny, Cassandra Knight, Phil Brease, Samantha Hilburn, and Vincent Santucci. Denali National Park and Preserve paleontological resources management plan. National Park Service, 2024. http://dx.doi.org/10.36967/2303431.

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Denali National Park and Preserve (DENA) in central Alaska is one of the most geologically and paleontologically diverse parks in the national park system. Fossils found at DENA help to untangle the convoluted bedrock history, record a Late Cretaceous ecosystem, and show changes in life here over several hundred million years. We have prepared a paleontological resources management plan (PRMP) to successfully administer these non-renewable resources in accordance with law and policy. This PRMP establishes goals and strategies for the comprehensive management of paleontological resources at DENA, considering more than a century of change and development of park programs and themes, agency policies and guidelines, and state and federal laws and regulations. Objectives include informing decisions and implementing best practices for paleontological resource management; ensuring the highest protection and preservation of paleontological resources; supporting and overseeing research on these resources; and promoting public outreach and education. This paleontological resources management plan provides a variety of information and recommendations to address these objectives. A brief geological history of DENA and descriptions of fossiliferous rock units provide context for the fossils. Fossil areas of interest and paleontological localities of concern are detailed for management. Practices and recommendations are presented for inventory and monitoring. The process of research permitting and practices for researchers are described. The state of collections and curation is considered. Interpretation and education are tied into existing themes, and venues and opportunities for additional outreach are described. A series of overall recommendations are provided that consider the objectives. Finally, data forms are provided for reference. This PRMP should be used as the foundation of future, more specialized, management plans or reports relating to paleontological resources at DENA.
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Crystal, Victoria, Justin Tweet, and Vincent Santucci. Yucca House National Monument: Paleontological resource inventory (public version). National Park Service, 2022. http://dx.doi.org/10.36967/nrr-2293617.

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Yucca House National Monument (YUHO) in southwestern Colorado protects unexcavated archeological structures that were constructed by the Ancestral Puebloan people between 1050 and 1300 CE. It was established by Woodrow Wilson by presidential proclamation in 1919 and named “Yucca House” by archeologist Jesse Fewkes as a reference to the names used for this area by the local Ute, Tewa Pueblo, and other Native groups. It was originally only 3.9 ha (9.6 ac) of land, but in 1990, an additional 9.7 ha (24 ac) of land was donated by Hallie Ismay, allowing for the protection of additional archeological resources. Another acquisition of new land is currently underway, which will allow for the protection of even more archeological sites. The archeological resources at YUHO remain unexcavated to preserve the integrity of the structures and provide opportunities for future generations of scientists. One of the factors that contributed to the Ancestral Puebloans settling in the area was the presence of natural springs. These springs likely provided enough water to sustain the population, and the Ancestral Puebloans built structures around one of the larger springs, Aztec Spring. Yet, geologic features and processes were shaping the area of southwest Colorado long before the Ancestral Puebloans constructed their dwellings. The geologic history of YUHO spans millions of years. The oldest geologic unit exposed in the monument is the Late Cretaceous Juana Lopez Member of the Mancos Shale. During the deposition of the Mancos Shale, southwestern Colorado was at the bottom of an inland seaway. Beginning about 100 million years ago, sea level rose and flooded the interior of North America, creating the Western Interior Seaway, which hosted a thriving marine ecosystem. The fossiliferous Juana Lopez Member preserves this marine environment, including the organisms that inhabited it. The Juana Lopez Member has yielded a variety of marine fossils, including clams, oysters, ammonites, and vertebrates from within YUHO and the surrounding area. There are four species of fossil bivalves (the group including clams and oysters) found within YUHO: Cameleolopha lugubris, Inoceramus dimidius, Inoceramus perplexus, and Pycnodonte sp. or Rhynchostreon sp. There are six species of ammonites in three genera found within YUHO: Baculites undulatus, Baculites yokoyamai, Prionocyclus novimexicanus, Prionocyclus wyomingensis, Scaphites warreni, and Scaphites whitfieldi. There is one unidentifiable vertebrate bone that has been found in YUHO. Fossils within YUHO were first noticed in 1875–1876 by W. H. Holmes, who observed fossils within the building stones of the Ancestral Puebloans’ structures. Nearly half of the building stones in the archeological structures at YUHO are fossiliferous slabs of the Juana Lopez Member. There are outcrops of the Juana Lopez 0.8 km (0.5 mi) to the west of the structures, and it is hypothesized that the Ancestral Puebloans collected the building stones from these or other nearby outcrops. Following the initial observation of fossils, very little paleontology work has been done in the monument. There has only been one study focused on the paleontology and geology of YUHO, which was prepared by paleontologist Mary Griffitts in 2001. As such, this paleontological resource inventory report serves to provide information to YUHO staff for use in formulating management activities and procedures associated with the paleontological resources. In 2021, a paleontological survey of YUHO was conducted to revisit previously known fossiliferous sites, document new fossil localities, and assess collections of YUHO fossils housed at the Mesa Verde National Park Visitor and Research Center. Notable discoveries made during this survey include: several fossils of Cameleolopha lugubris, which had not previously been found within YUHO; and a fossil of Pycnodonte sp. or Rhynchostreon sp. that was previously unknown from within YUHO.
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