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Journal articles on the topic 'Geology – Arizona – Grand Canyon Region'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Sabbeth, Leah, Brian P. Wernicke, Timothy D. Raub, Jeffrey A. Grover, E. Bruce Lander, and Joseph L. Kirschvink. "Grand Canyon provenance for orthoquartzite clasts in the lower Miocene of coastal southern California." Geosphere 15, no. 6 (2019): 1973–98. http://dx.doi.org/10.1130/ges02111.1.

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Abstract Orthoquartzite detrital source regions in the Cordilleran interior yield clast populations with distinct spectra of paleomagnetic inclinations and detrital zircon ages that can be used to trace the provenance of gravels deposited along the western margin of the Cordilleran orogen. An inventory of characteristic remnant magnetizations (CRMs) from >700 sample cores from orthoquartzite source regions defines a low-inclination population of Neoproterozoic–Paleozoic age in the Mojave Desert–Death Valley region (and in correlative strata in Sonora, Mexico) and a moderate- to high-inclina

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2

Crow, Ryan S., Keith A. Howard, L. Sue Beard, et al. "Insights into post-Miocene uplift of the western margin of the Colorado Plateau from the stratigraphic record of the lower Colorado River." Geosphere 15, no. 6 (2019): 1826–45. http://dx.doi.org/10.1130/ges02020.1.

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Abstract The spatial and temporal distribution of Pliocene to Holocene Colorado River deposits (southwestern USA and northwestern Mexico) form a primary data set that records the evolution of a continental-scale river system and helps to delineate and quantify the magnitude of regional deformation. We focus in particular on the age and distribution of ancestral Colorado River deposits from field observations, geologic mapping, and subsurface studies in the area downstream from Grand Canyon (Arizona, USA). A new 4.73 ± 0.17 Ma age is reported for a basalt that flowed down Grand Wash to near its

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3

Karlstrom, K. E., M. T. Mohr, M. D. Schmitz, et al. "Redefining the Tonto Group of Grand Canyon and recalibrating the Cambrian time scale." Geology 48, no. 5 (2020): 425–30. http://dx.doi.org/10.1130/g46755.1.

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Abstract We applied tandem U-Pb dating of detrital zircon (DZ) to redefine the Tonto Group in the Grand Canyon region (Arizona, USA) and to modify the Cambrian time scale. Maximum depositional ages (MDAs) based upon youngest isotope-dilution DZ ages for the Tapeats Sandstone are ≤508.19 ± 0.39 Ma in eastern Grand Canyon, ≤507.68 ± 0.36 Ma in Nevada, and ≤506.64 ± 0.32 Ma in central Arizona. The Sixtymile Formation, locally conformable below the Tapeats Sandstone, has a similar MDA (≤508.6 ± 0.8 Ma) and is here added to the Tonto Group. We combined these precise MDAs with biostratigraphy of tri

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4

Huntoon, Peter W. "Variability of karstic permeability between unconfined and confined aquifers, Grand Canyon region, Arizona." Environmental and Engineering Geoscience 6, no. 2 (2000): 155–70. http://dx.doi.org/10.2113/gseegeosci.6.2.155.

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Abstract Most of the ground water in the Grand Canyon region circulates to springs in the canyon through the thick, deeply buried, karstified Cambrian-Mississippian carbonate section. These rocks are collectively called the lower Paleozoic carbonates and comprise the Redwall-Muav aquifer where saturated. The morphologies of the caves in the Grand Canyon are primarily a function of whether the carbonates are unconfined or confined, a distinction that has broad significance for ground-water exploration and which appears to be generally transferable to other carbonate regions. Caves in unconfined

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5

Wheatley, David, Winston Seiler, and Marjorie Chan. "The Wind-Swept Nautilus, Enigmatic Clastic Pipes, and Toadstool Landforms: Geologic Features of the Paria Plateau." Geosites 1 (December 31, 2019): 1–11. http://dx.doi.org/10.31711/geosites.v1i1.67.

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The Colorado Plateau occupies much of the southwestern United States including portions of Arizona, Colorado, Utah, and New Mexico. This region presents unobstructed views from mesa tops, beautifully colored soils, lone standing buttes, and canyons cut thousands of feet deep. The Colorado Plateau represents a well-preserved window into the Earth’s history. Today, the rocks of the Colorado Plateau lie roughly horizontally, as they were deposited hundreds of millions of years ago. The Plateau’s rise has motivated rivers, in their downhill progress, to carve innumerable canyons. These river canyo

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6

Keeler, Raymond, and Bradley Lusk. "Microbiome of Grand Canyon Caverns, a dry sulfuric karst cave in Arizona, supports diverse extremo-philic bacterial and archaeal communities." Journal of Cave and Karst Studies 83, no. 1 (2021): 44–56. http://dx.doi.org/10.4311/2019mb0126.

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We analyzed the microbial community of multicolored speleosol deposits found in Grand Canyon Caverns, a dry sulfuric karst cave in northwest Arizona, USA. Underground cave and karst systems harbor a great range of microbial diversity; however, the inhabitants of dry sulfuric karst caves, including extremophiles, remain poorly understood. Understanding the microbial communities inhabiting cave and karst systems is essential to provide information on the multidirectional feedback between biology and geology, to elucidate the role of microbial biogeochemical processes on cave formation, and poten

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7

Landais, P., E. Brosse, J. C. Carisey, A. J. Meyer, and M. Pagel. "Combined use of fluid inclusions, fission tracks, organic matter analyses and computer modelling for assessing the thermal history of Permain formations (Grand Canyon Region, Arizona, U.S.A.)." Chemical Geology 70, no. 1-2 (1988): 185. http://dx.doi.org/10.1016/0009-2541(88)90744-9.

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8

Lucchitta, Ivo, and Richard Holm. "Re-evaluation of exotic gravel and inverted topography at Crooked Ridge, northern Arizona: Relicts of an ancient river of regional extent." Geosphere 16, no. 2 (2020): 533–45. http://dx.doi.org/10.1130/ges02166.1.

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Abstract An ancient drainage, named Crooked Ridge river, is unique on the Colorado Plateau in extent, physiography, and preservation of its alluvium. This river is important for deciphering the generally obscure evolution of rivers in this region. The ancient course of the river is well preserved in inverted relief and in a large valley for a distance of several tens of kilometers on the Kaibito Plateau–White Mesa areas of northern Arizona. The prominent landform ends ∼45 km downstream from White Mesa at a remarkable wind gap carved in the Echo Cliffs. The Crooked Ridge river alluvium contains

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9

Karlstrom, Karl E., Carl E. Jacobson, Kurt E. Sundell, et al. "Evaluating the Shinumo-Sespe drainage connection: Arguments against the “old” (70–17 Ma) Grand Canyon models for Colorado Plateau drainage evolution." Geosphere 16, no. 6 (2020): 1425–56. http://dx.doi.org/10.1130/ges02265.1.

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Abstract The provocative hypothesis that the Shinumo Sandstone in the depths of Grand Canyon was the source for clasts of orthoquartzite in conglomerate of the Sespe Formation of coastal California, if verified, would indicate that a major river system flowed southwest from the Colorado Plateau to the Pacific Ocean prior to opening of the Gulf of California, and would imply that Grand Canyon had been carved to within a few hundred meters of its modern depth at the time of this drainage connection. The proposed Eocene Shinumo-Sespe connection, however, is not supported by detrital zircon nor pa

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10

Resor, P. G. "Deformation associated with a continental normal fault system, western Grand Canyon, Arizona." Geological Society of America Bulletin 120, no. 3-4 (2008): 414–30. http://dx.doi.org/10.1130/b26107.1.

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11

Pelletier, J. D. "Numerical modeling of the late Cenozoic geomorphic evolution of Grand Canyon, Arizona." Geological Society of America Bulletin 122, no. 3-4 (2009): 595–608. http://dx.doi.org/10.1130/b26403.1.

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12

Schmidt, John C. "Recirculating Flow and Sedimentation in the Colorado River in Grand Canyon, Arizona." Journal of Geology 98, no. 5 (1990): 709–24. http://dx.doi.org/10.1086/629435.

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13

Gehrels, George E., Ron Blakey, Karl E. Karlstrom, J. Michael Timmons, Bill Dickinson, and Mark Pecha. "Detrital zircon U-Pb geochronology of Paleozoic strata in the Grand Canyon, Arizona." Lithosphere 3, no. 3 (2011): 183–200. http://dx.doi.org/10.1130/l121.1.

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14

Whitmore, John H., and Ray Strom. "Sand injectites at the base of the Coconino Sandstone, Grand Canyon, Arizona (USA)." Sedimentary Geology 230, no. 1-2 (2010): 46–59. http://dx.doi.org/10.1016/j.sedgeo.2010.06.022.

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15

Phillips, David A., and Robert C. Euler. "The Archaeology, Geology, and Paleobotany of Stanton's Cave: Grand Canyon National Park, Arizona." American Antiquity 52, no. 1 (1987): 208. http://dx.doi.org/10.2307/281087.

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16

Fenton, Cassandra R., Robert J. Poreda, Barbara P. Nash, Robert H. Webb, and Thure E. Cerling. "Geochemical Discrimination of Five Pleistocene Lava‐Dam Outburst‐Flood Deposits, Western Grand Canyon, Arizona." Journal of Geology 112, no. 1 (2004): 91–110. http://dx.doi.org/10.1086/379694.

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17

Holland, Mark E., K. E. Karlstrom, M. F. Doe, et al. "An imbricate midcrustal suture zone: The Mojave-Yavapai Province boundary in Grand Canyon, Arizona." Geological Society of America Bulletin 127, no. 9-10 (2015): 1391–410. http://dx.doi.org/10.1130/b31232.1.

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18

Larson, E. E., P. E. Patterson, and F. E. Mutschler. "Lithology, chemistry, age, and origin of the Proterozoic Cardenas Basalt, Grand Canyon, Arizona." Precambrian Research 65, no. 1-4 (1994): 255–76. http://dx.doi.org/10.1016/0301-9268(94)90108-2.

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19

Malmos, K., R. Reed, and B. Starrett. "Hybridization between Bufo woodhousii and bufo punctatus from the Grand Canyon region of Arizona." Great Basin naturalist. 55 (1995): 368–71. http://dx.doi.org/10.5962/bhl.part.22807.

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20

Lucchitta, Ivo, Richard F. Holm, and Baerbel K. Lucchitta. "A Miocene river in northern Arizona and its implications for the Colorado River and Grand Canyon." GSA Today 21, no. 10 (2011): 4–10. http://dx.doi.org/10.1130/g119a.1.

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21

Meyer, A. J., P. Landais, E. Brosse, M. Pagel, J. C. Carisey, and D. Krewdl. "Thermal history of the Permian formations from the Breccia Pipes area (Grand Canyon region, Arizona)." Geologische Rundschau 78, no. 1 (1989): 427–38. http://dx.doi.org/10.1007/bf01988374.

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22

Kavanaugh, David H. "A new species of Nebria Latreille (Coleoptera: Carabidae: Nebriini) from the Grand Canyon, Arizona." Annals of Carnegie Museum 77, no. 1 (2008): 1–5. http://dx.doi.org/10.2992/0097-4463-77.1.1.

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23

Fenton, Cassandra R., Robert H. Webb, Philip A. Pearthree, Thure E. Cerling, and Robert J. Poreda. "Displacement rates on the Toroweap and Hurricane faults: Implications for Quaternary downcutting in the Grand Canyon, Arizona." Geology 29, no. 11 (2001): 1035. http://dx.doi.org/10.1130/0091-7613(2001)029<1035:drotta>2.0.co;2.

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24

Hill, C. A., and V. J. Polyak. "Karst piracy: A mechanism for integrating the Colorado River across the Kaibab uplift, Grand Canyon, Arizona, USA." Geosphere 10, no. 4 (2014): 627–40. http://dx.doi.org/10.1130/ges00940.1.

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25

Sankey, Temuulen Ts, Joel B. Sankey, Rene Horne, and Ashton Bedford. "Remote Sensing of Tamarisk Biomass, Insect Herbivory, and Defoliation: Novel Methods in the Grand Canyon Region, Arizona." Photogrammetric Engineering & Remote Sensing 82, no. 8 (2016): 645–52. http://dx.doi.org/10.14358/pers.82.8.645.

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26

Douglas, Michael E., and Paul C. Marsh. "Population Estimates/Population Movements of Gila cypha, an Endangered Cyprinid Fish in the Grand Canyon Region of Arizona." Copeia 1996, no. 1 (1996): 15. http://dx.doi.org/10.2307/1446938.

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27

STAUFFER†, DAVID R., NELSON L. SEAMAN, THOMAS T. WARNER, and ANNETTE M. LARIO. "APPLICATION OF AN ATMOSPHERIC SIMULATION MODEL TO DIAGNOSE AIR-POLLUTION TRANSPORT IN THE GRAND CANYON REGION OF ARIZONA." Chemical Engineering Communications 121, no. 1 (1993): 9–25. http://dx.doi.org/10.1080/00986449308936135.

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28

Flowers, R. M., D. L. Shuster, B. P. Wernicke, and K. A. Farley. "Radiation damage control on apatite (U-Th)/He dates from the Grand Canyon region, Colorado Plateau." Geology 35, no. 5 (2007): 447. http://dx.doi.org/10.1130/g23471a.1.

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29

Shufeldt, O. P., K. E. Karlstrom, G. E. Gehrels, and K. E. Howard. "Archean detrital zircons in the Proterozoic Vishnu Schist of the Grand Canyon, Arizona: Implications for crustal architecture and Nuna supercontinent reconstructions." Geology 38, no. 12 (2010): 1099–102. http://dx.doi.org/10.1130/g31335.1.

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30

White, M. A., and J. L. Vankat. "Middle and high elevation coniferous forest communities of the North Rim region of Grand Canyon National Park, Arizona, USA." Vegetatio 109, no. 2 (1993): 161–74. http://dx.doi.org/10.1007/bf00044748.

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31

O'Brien, Gary R., Darrell S. Kaufman, Warren D. Sharp, Viorel Atudorei, Roderic A. Parnell, and Laura J. Crossey. "Oxygen isotope composition of annually banded modern and mid-Holocene travertine and evidence of paleomonsoon floods, Grand Canyon, Arizona, USA." Quaternary Research 65, no. 3 (2006): 366–79. http://dx.doi.org/10.1016/j.yqres.2005.12.001.

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AbstractHolocene and modern travertine formed in spring-fed Havasu Creek of the Grand Canyon, Arizona, was studied to determine the factors governing its oxygen-isotope composition. Analysis of substrate-grown travertine indicates that calculated calcite-formation temperatures compare favorably with measured water temperatures, and include silt-rich laminae deposited by monsoon-driven floods. Ancient spring-pool travertine is dated by U-series at 7380 ± 110 yr and consists of 14 travertine-silt couplets of probable annual deposition. One hundred eighty high-resolution δ18O analyses of this mid

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32

Weil, Arlo B., John W. Geissman, and Rob Van der Voo. "Paleomagnetism of the Neoproterozoic Chuar Group, Grand Canyon Supergroup, Arizona: implications for Laurentia’s Neoproterozoic APWP and Rodinia break-up." Precambrian Research 129, no. 1-2 (2004): 71–92. http://dx.doi.org/10.1016/j.precamres.2003.09.016.

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33

Riley, Kerry E., Tammy M. Rittenour, Joel L. Pederson, and Patrick Belmont. "Erosion rates and patterns in a transient landscape, Grand Staircase, southern Utah, USA." Geology 47, no. 9 (2019): 811–14. http://dx.doi.org/10.1130/g45993.1.

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AbstractCosmogenic 10Be concentrations in alluvial sediment are widely used to infer long-term, catchment-averaged erosion rates based on the assumption that the landscape is in mass-flux steady state. However, many landscapes are out of equilibrium over millennial time scales due to tectonic and climatic forcing. The Grand Staircase of the Colorado Plateau (North America) is a transient landscape, adjusting to base-level fall from the carving of the Grand Canyon, and is characterized by cliff-bench topography caused by differential erosion of lithologic units. The 10Be concentrations from 52

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34

Cole, Kenneth L., and Samantha T. Arundel. "Carbon isotopes from fossil packrat pellets and elevational movements of Utah agave plants reveal the Younger Dryas cold period in Grand Canyon, Arizona." Geology 33, no. 9 (2005): 713. http://dx.doi.org/10.1130/g21769.1.

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35

Baldwin, Christopher T., P. K. Strother, J. H. Beck, and Eben Rose. "Palaeoecology of the Bright Angel Shale in the eastern Grand Canyon, Arizona, USA, incorporating sedimentological, ichnological and palynological data." Geological Society, London, Special Publications 228, no. 1 (2004): 213–36. http://dx.doi.org/10.1144/gsl.sp.2004.228.01.11.

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36

Foster, Dennis, and Craig Bain. "Artificial Project Time Horizons In The Absence Of Discounting: The Case Of Canyon Forest Village." Journal of Business Case Studies (JBCS) 8, no. 1 (2011): 115–22. http://dx.doi.org/10.19030/jbcs.v8i1.6745.

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In the summer of 1997, the Kaibab National Forest released the Draft Environmental Impact Statement for Tusayan Growth. This report analyzed various scenarios involving the transfer of National Forest land at the boundary of the Grand Canyon National Park to a private developer, in exchange for private inholdings scattered throughout the Kaibab National Forest in northern Arizona. The resulting private development was to be called Canyon Forest Village, and would include hotels, visitor facilities, private housing, community facilities and a transportation center for tourists accessing the Gra

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37

Seaman, S. J., M. L. Williams, K. E. Karlstrom, and P. C. Low. "Petrogenesis of the 91-Mile peridotite in the Grand Canyon: Ophiolite or deep-arc fragment?" Geosphere 17, no. 3 (2021): 786–803. http://dx.doi.org/10.1130/ges02302.1.

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Abstract Recognition of fundamental tectonic boundaries has been extremely diffi-cult in the (&gt;1000-km-wide) Proterozoic accretionary orogen of south western North America, where the main rock types are similar over large areas, and where the region has experienced multiple postaccretionary deformation events. Discrete ultramafic bodies are present in a number of areas that may mark important boundaries, especially if they can be shown to represent tectonic fragments of ophiolite complexes. However, most ultramafic bodies are small and intensely altered, precluding petrogenetic analysis

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38

Sankey, Joel B., Joshua Caster, Alan Kasprak, and Amy E. East. "The response of source-bordering aeolian dunefields to sediment-supply changes 2: Controlled floods of the Colorado River in Grand Canyon, Arizona, USA." Aeolian Research 32 (June 2018): 154–69. http://dx.doi.org/10.1016/j.aeolia.2018.02.004.

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39

Heizler, Matthew T., Karl E. Karlstrom, Micael Albonico, et al. "Detrital sanidine 40Ar/39Ar dating confirms <2 Ma age of Crooked Ridge paleoriver and subsequent deep denudation of the southwestern Colorado Plateau." Geosphere 17, no. 2 (2021): 438–54. http://dx.doi.org/10.1130/ges02319.1.

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Abstract Crooked Ridge and White Mesa in northeastern Arizona (southwestern United States) preserve, as inverted topography, a 57-km-long abandoned alluvial system near the present drainage divide between the Colorado, San Juan, and Little Colorado Rivers. The pathway of this paleoriver, flowing southwest toward eastern Grand Canyon, has led to provocative alternative models for its potential importance in carving Grand Canyon. The ∼50-m-thick White Mesa alluvium is the only datable record of this paleoriver system. We present new 40Ar/39Ar sanidine dating that confirms a ca. 2 Ma maximum depo

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40

Eyster, Athena, Benjamin P. Weiss, Karl Karlstrom, and Francis A. Macdonald. "Paleomagnetism of the Chuar Group and evaluation of the late Tonian Laurentian apparent polar wander path with implications for the makeup and breakup of Rodinia." GSA Bulletin 132, no. 3-4 (2019): 710–38. http://dx.doi.org/10.1130/b32012.1.

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AbstractPaleogeographic models commonly assume that the supercontinent Rodinia was long-lived, with a static geometry involving Mesoproterozoic links that developed during assembly and persisted until Neoproterozoic rifting. However, Rodinian paleogeography and dynamics of continental separation around its centerpiece, Laurentia, remain poorly constrained. On the western Laurentian margin, geological and geochronological data suggest that breakup did not occur until after 720 Ma. Thus, late Tonian (ca. 780–720 Ma) paleomagnetic data are critical for reconstructing paleogeography prior to dispe

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41

Peak, B. A., R. M. Flowers, F. A. Macdonald, and J. M. Cottle. "Zircon (U-Th)/He thermochronology reveals pre-Great Unconformity paleotopography in the Grand Canyon region, USA." Geology, August 12, 2021. http://dx.doi.org/10.1130/g49116.1.

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The Great Unconformity is an iconic geologic feature that coincides with an enigmatic period of Earth’s history that spans the assembly and breakup of the supercontinent Rodinia and the Snowball Earth glaciations. We use zircon (U-Th)/He thermochronology (ZHe) to explore the erosion history below the Great Unconformity at its classic Grand Canyon locality in Arizona, United States. ZHe dates are as old as 809 ± 25 Ma with data patterns that differ across both long (~100 km) and short (tens of kilometers) spatial wavelengths. The spatially variable thermal histories implied by these data are be

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42

William P. Casadevall. "Exploration Geology of Canyon Breccia Pipe South of Grand Canyon, Arizona: ABSTRACT." AAPG Bulletin 73 (1989). http://dx.doi.org/10.1306/44b4a622-170a-11d7-8645000102c1865d.

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43

David M. Rubin, John C. Schmidt (2). "Origin, Structure, and Evolution of a Reattachment Bar, Colorado River, Grand Canyon, Arizona." SEPM Journal of Sedimentary Research Vol. 60 (1990). http://dx.doi.org/10.1306/d426765e-2b26-11d7-8648000102c1865d.

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44

Crow, R. S., J. Schwing, K. E. Karlstrom, et al. "Redefining the age of the lower Colorado River, southwestern United States." Geology, February 22, 2021. http://dx.doi.org/10.1130/g48080.1.

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Sanidine dating and magnetostratigraphy constrain the timing of integration of the lower Colorado River (southwestern United States and northern Mexico) with the evolving Gulf of California. The Colorado River arrived at Cottonwood Valley (Nevada and Arizona) after 5.24 Ma (during or after the Thvera subchron). The river reached the proto–Gulf of California once between 4.80 and 4.63 Ma (during the C3n.2r subchron), not at 5.3 Ma and 5.0 Ma as previously proposed. Duplication of section across newly identified strands of the Earthquake Valley fault zone (California) probably explains the discr

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45

Chapman, Katherine A., Rebecca J. Best, M. Elliot Smith, Erich R. Mueller, Paul E. Grams, and Roderic A. Parnell. "Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona." GSA Bulletin, October 28, 2020. http://dx.doi.org/10.1130/b35642.1.

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Completion of Glen Canyon Dam in 1963 resulted in complete elimination of sediment delivery from the upstream Colorado River basin to Grand Canyon and nearly complete control of spring snowmelt floods responsible for creating channel and bar morphology. Management of the river ecosystem in Grand Canyon National Park now relies on dam-release floods to redistribute tributary-derived sediment accumulated on the channel bed to higher-elevation sandbars. Here, we used multivariate mixing analysis of sediment elemental compositions to evaluate the extent to which flood deposits derive from tributar

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46

Paul W. Grover. "Depositional Environment and Mineralization of Late Mississippian Surprise Canyon Formation, a Carbonate-Clastic Estuarine Deposit, Grand Canyon, Arizona: ABSTRACT." AAPG Bulletin 70 (1986). http://dx.doi.org/10.1306/94886790-1704-11d7-8645000102c1865d.

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47

James G. Palacas, Mitchell W. Reyno. "Preliminary Petroleum Source Rock Assessment of Upper Proterozoic Chuar Group, Grand Canyon, Arizona: ABSTRACT." AAPG Bulletin 73 (1989). http://dx.doi.org/10.1306/703ca1e4-1707-11d7-8645000102c1865d.

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48

TROUTMAN, TONY J., University of Te. "ABSTRACT: Reservoir Characterization, Paleoenvironment, and Paleogeomorphology of the Mississippian Redwall Limestone Paleokarst, Hualapai Indian Reservation, Grand Canyon Area, Arizona." AAPG Bulletin 84 (2000). http://dx.doi.org/10.1306/8626c61d-173b-11d7-8645000102c1865d.

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49

McNab, Fergus, and Nicky White. "Geodynamic significance of a buried transient Carboniferous landscape." GSA Bulletin, August 8, 2021. http://dx.doi.org/10.1130/b36002.1.

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It is increasingly clear that present-day dynamic topography on Earth, which is generated and maintained by mantle convective processes, varies on timescales and length scales on the order of 1−10 m.y. and 103 km, respectively. A significant implication of this behavior is that Phanerozoic stratigraphic records should contain indirect evidence of these processes. Here, we describe and analyze a well-exposed example of an ancient landscape from the Grand Canyon region of western North America that appears to preserve a transient response to mantle processes. The Surprise Canyon Formation lies c

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50

SEELEY, JOHN M., and G. RANDY KELLE. "Abstract: Delineation of Subsurface Proterozoic Chuar Group / Unkar Group (Grand Canyon Supergroup) Sedimentary Basin Deposits in Northern Arizona Utilizing Gravity and Magnetic Geophysical Techniques ." AAPG Bulletin 83 (1999) (1999). http://dx.doi.org/10.1306/c9ebc789-1735-11d7-8645000102c1865d.

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