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1
Christopherson, John Ostler 1956. "Effects of prescribed fire on fuel accumulation rates and selected soil nutrients." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277123.
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Fuel accumulation rate and total soil nitrogen, phosphorus, and sulfur following prescribed fires were studied. Three prescribed fires were conducted in S.E. Arizona ponderosa pine stands during the summers of 1979, 1980, and 1981. Samples of forest floor and larger diameter fuel and soil from the surface 1.5 inches and 1.5 to 3.0 inch layers were collected in the summer of 1981. Forest floor and total fuel accumulation averaged 5.4 to 6.7 and 6.3 to 8.9 tons/acre/year, respectively. Total nitrogen, phosphorus, and sulfur in the surface three inches of mineral soil were not significantly affected by burning. Soil nitrogen, phosphorus, and sulfur content averaged 0.21%, 344 ppm and 150 ppm, respectively, in the surface 1.5 inches and 0.11%, 285 ppm and 74 ppm, respectively, in the 1.5 to 3.0 inch layer.
2
Young, David Paul. "The history of deformation and fluid phenomena in the top of the wilderness suite, Santa Catalina Mountains, Pima County, Arizona." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/558089.
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3
Haile, Abdi Barre 1956. "Possible water pollution sources in Sabino Creek, Santa Catalina Mountains, Arizona." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/191949.
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Sabino Canyon is an important source of recreation for the Tucson Area. Human activities near the creek have caused pollution problems. This was especially noticeable in the Summerhaven area, where during 1970's a malfunctioning sewage treatment plant was discharging into Sabino Creek. During 1982, a new treatment facility was constructed with zero discharge into the creek. In the Lower Sabin° Creek recreation area, no sampling has been done since then. Thus, this research was designed to assess the extent of stream's pollution and to identify possible water pollution sources and to investigate the stream discharge-water quality relationship for Sabin° Creek. Selected water quality parameters were used as pollution indicators. Among the considered parameters were: Cl, NO₃, PO₄, SO₄, Ca, TDS, and pH. Chemical Hydrographs were used as a tool to interpret the collected data. The results of the study indicated no major pollution sources. In addition, the creek's water was suitable for most beneficial uses. The results also indicated that concentrations of most chemical constituents were diluted by the increase of stream flow. Sulphate and chloride ions didn't show strong dilution with increasing flow and this behavior was thought to be related to autumn flushing, or atmospheric inputs. Finally, holidays and weekend recreational activities did not seem to have an immediate impact on the creek's water quality.
4
Etchberger, Richard Carl 1957. "Mountain sheep habitat characteristics in the Pusch Ridge Wilderness, Arizona." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276839.
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Mountain sheep (Ovis canadensis mexicana) in the Pusch Ridge Wilderness (PRW), Santa Catalina Mountains, Arizona have abandoned historic habitat and now occupy 44 km². I used univariate analyses to quantify differences of physiographic and vegetational variables between abandoned habitat and habitat that is still used by mountain sheep. A discriminant function model characterized the magnitude of the differences between the 2 habitats. Habitat that supports mountain sheep has less human disturbance and is more open with more side oats grama (Bouteloua curtipendula), red brome (Bromus rubens), brittle bush (Encelia farinosa), and forb cover, but less ground cover, bush muhly (Muhlenbergia porteri), and turpentine bush (Haplopappus laricifolius) than habitat that was abandoned by mountain sheep. Fire is important in still used habitat because it reduces tall plants that obstruct mountain sheep vision. Human disturbances should be minimized in mountain sheep habitat.
5
Horton, Scott Patterson 1951. "Effects of prescribed burning on breeding birds in a ponderosa pine forest, southeastern Arizona." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276570.
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A moderately intense, broadcast, understory, prescribed burn in 3 previously unburned ponderosa pine stands in southeastern Arizona felled or consumed 50% of all ponderosa pine snags ≥ 15 cm dbh. Large moderately decayed snags were most susceptible to burning. Large snags in the early stages of decay were preferred as nest sites by cavity-nesting birds. Numbers of live woody plants were reduced by 40%, mortality was greatest among shrubs and small trees. Canopy volume was reduced by 19%, the greatest impact was below 5 m. No species of cavity-nesting birds, or birds that associated with understory vegetation disappeared in the first season after burning, but 3 species decreased, and 1 species increased in abundance. The minor impacts of a single treatment with broadcast understory burning on bird populations will be ephemeral, but a repeated burns could have greater, and more lasting effects on the avian community.
6
Bykerk-Kauffman, Ann. "Structural evolution of the northeastern Santa Catalina Mountains, Arizona: A glimpse of the pre-extension history of the Catalina complex." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185070.
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The Catalina complex, like the other Cordilleran metamorphic core complexes, experienced an episode of profound middle Tertiary extension that resulted in low-angle mylonite zones and detachment faults. However, the northern and eastern parts of the complex escaped significant middle Tertiary deformation and preserved a record of the complicated Mesozoic and early Cenozoic tectonic history that preceded middle Tertiary extension. A detailed examination of the northeastern Santa Catalina Mountains and a reconnaissance study of the rest of the Catalina complex reveal evidence for Cretaceous-earliest Tertiary (Laramide) thrusting and an enigmatic episode of early Tertiary (Eocene?) magmatic intrusion, metamorphism and ductile deformation. Laramide thrusting is represented by the Edgar and Youtcy thrusts. The Edgar thrust, a southwest(?)-vergent bedding-subparallel fault that repeats 300-500 m of section, is intruded by the 64 Ma Leatherwood Quartz Diorite. The northeast(?)-vergent Youtcy thrust repeats at least 1300 m of section and is intruded by the Eocene(?) Wilderness Granite. The early Tertiary orogenic event is represented in the northeastern Santa Catalina Mountains by the Eocene(?) Wilderness Granite, its metamorphic aureole, widespread low-grade metamorphism, bedding-subparallel foliations, east-trending lineations, and several bedding-subparallel stretching(?) faults that omit strata. Numerous kinematic indicators show that the ductile deformation involved top-to-the-east shear. Cross-cutting relationships between the foliation, the faults and the Wilderness Granite and coincident gradients in strain magnitude, metamorphic grade, rock ductility, and fault offset demonstrate that intrusion, metamorphism, ductile flow and faulting were all contemporaneous and that the heat source for the metamorphism and ductile flow was the Wilderness Granite. Evidence for the early Tertiary event extends into the rest of the Catalina complex but lineation trends and shear directions vary considerably from region to region. Furthermore, abundant steep east-striking foliations within the Wilderness Granite batholith appear to have formed during this event. The tectonic significance of the early Tertiary orogenic episode is unclear. Three hypotheses may explain the wide variety of early Tertiary structures: forceful diapiric intrusion of the Wilderness Granite, late-stage Laramide thrusting imposed on a tilted section, or early-stage crustal extension.
7
Holleran, Molly E. "Quantifying catchment scale soil variability in Marshall Gulch, Santa Catalina Mountains Critical Zone Observatory." Thesis, The University of Arizona, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1538334.
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<p> The quantification and prediction of soil properties is fundamental to further understanding the Critical Zone (CZ). In this study we aim to quantify and predict soil properties within a forested catchment, Marshall Gulch, AZ. Input layers of soil depth (modeled), slope, Saga wetness index, remotely sensed normalized difference vegetation index (NDVI) and national agriculture imagery program (NAIP) bands 3/2 were determined to account for 95% of landscape variance and used as model predictors. Target variables including soil depth (cm), carbon (kg/m<sup>2</sup>), clay (%), Na flux (kg/m<sup> 2</sup>), pH, and strain are predicted using multivariate linear step-wise regression models. Our results show strong correlations of soil properties with the drainage systems in the MG catchment. We observe deeper soils, higher clay content, higher carbon content, and more Na loss within the drainages of the catchment in contrast to the adjacent slopes and ridgelines.</p>
8
Janecke, Susanne Ursula 1959. "Structural geology and tectonic history of the Geesaman Wash area, Santa Catalina Mountains, Arizona." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/558061.
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Barger, Erin E. "Migration of Recharge Water Downgradient from the Santa Catalina Mountains into the Tucson Basin Aquifer." Thesis, The University of Arizona, 1996. http://hdl.handle.net/10150/249235.
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Aquifers in the arid alluvial basins of the southwestern U.S. are recharged predominantly by infiltration from streams within the basins and by water entering along the margins of the basins from surrounding mountains (mountain -front recharge). The Tucson Basin of Southeastern Arizona is such a basin. The Santa Catalina Mountains form the northern boundary of this basin and receive more than twice as much precipitation (about 70 cm/yr) as the basin does (about 30 cm/yr). In this study environmental isotopes were employed to investigate the migration of precipitation basinward through joints and fractures. Water samples were obtained from springs in the Santa Catalina Mountains. Stable isotopes and thermonuclear bomb-produced tritium enabled qualitative characterizations of flow paths and flow velocities. Stable isotopic measurements fail to display a direct altitude effect. Tritium values indicate that although a few springs discharge pre-bomb water, most springs discharge waters from the 1960's or later.
10
Hawkins, Tricia Oshant. "A Case Study Analysis of Collaborative Conservation| Restoring Bighorn Sheep to the Santa Catalina Mountains." Thesis, Prescott College, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10687851.
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<p> Involving a diversity of stakeholders in conservation issues is an important and growing trend in wildlife management. My thesis provides a case study of a collaborative conservation effort in which representatives from sportsmen’s and environmental groups came together to advise the Arizona Game and Fish Department in a project to restore bighorn sheep to the Santa Catalina Mountains near Tucson, Arizona. These stakeholders formed the Catalina Bighorn Sheep Restoration Advisory Committee to help address the human dimension factors of the project, build public support, and guide project planning and implementation. In addition to participant observation and document analysis informing my study, I surveyed 31 stakeholders both on and off the Advisory Committee and interviewed key Advisory Committee members. All stakeholders were in favor of collaborative conservation. However, there were objections to this particular Advisory Committee for this particular project. Although stakeholders had a diversity of values that informed their beliefs, the Advisory Committee members who took the time to understand the science involved, develop mutual trust and respect for others at the table, and held a strong commitment to the project goals were able to shift deeply held, values-based beliefs and find consensus on contentious project elements. This included agreeing on a mountain lion management plan that called for the killing of mountain lions that preyed on the newly reintroduced bighorn sheep. Stakeholders not on the Advisory Committee did not come to agreement on most elements of the project. This study contributes to the understanding of collaborative conservation efforts by providing a case study of a controversial wildlife conservation project that involved diverse stakeholders who worked together, successfully found consensus, and achieved their main goal of getting bighorn sheep back on the mountain.</p><p>
11
Pfister, Rachel Walker 1940. "Effects of nectar robbing by Xylocopa californica on Chilopsis linearis (Bignoniaceae)." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277005.
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The interaction between Xylocopa californica and Chilopsis linearis was used to test the hypothesis that nectar robbing is costly to plants. No evidence for these costs, either in terms of decreased pollination or increased energy demands, was found. In fact, the mean number of seeds per fruit and the mean individual weight of seeds per fruit was higher from fruits that developed from robbed flowers than from fruits that developed from unrobbed flowers, indicating that the presence of Xylocopa californica enhanced pollination. Chilopsis linearis pollen was isolated from the tips of the abdomens of robbing Xylocopa californica and it was determined that these bees could be transferring pollen from flower to flower as they position themselves to rob. This association was found to be one of mutual benefit rather than one of exploitation.
12
Gottfried, Gerald J., and Peter F. Ffolliott. "Contributions of Snowmelt to Streamflow in Southeastern Arizona: A Case Study from the Santa Catalina Mountains." Arizona-Nevada Academy of Science, 2011. http://hdl.handle.net/10150/296993.
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13
Bezy, John Vincent. "The development of granite landforms on the northern and western margins of the Santa Catalina Mountains, Arizona." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282782.
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The scientific literature regarding the origin of granite landscapes is dominated climatic geomorphologists who argue that these landscapes are the products of deep weathering of highly jointed granite under tropical climates, or structural geomorphologists who insist that structure and lithology are of greater importance than climate. This study examines the origin of three distinct landscapes found on three granite pediments along the western and northern margins of the Santa Catalina Mountains of southeastern Arizona. The Oracle granite pediments are dominated by boulder inselbergs, those of the Catalina granite by domed inselbergs and platforms, while Wilderness Suite granite pediments are sloping shelves that lack these characteristic landforms. These granites have a similar late Cenozoic history of weathering and erosion, but differ in structure, lithology, and age. Field evidence and laboratory analysis support the arguments of structural geomorphologists and indicate that the model presented by climatic geomorphologists is not valid for the study area. The landforms found here appear to be the products of surface weathering and fluvial erosion guided by joints and lithology.
14
Maghran, Lauren A. "Recovery and Changes in Plant Communities from Two Large Fires in the Santa Catalina Mountains, Arizona, USA." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/337365.
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In mountains throughout western North America, large, mixed-severity fires produce a mosaic of low and high tree mortality. Following wildfire, plant communities may recover to their pre-fire state, or may remain altered in composition and structure. In this study I quantified the extent to which fire severity influenced post-fire vegetation composition and structure in comparison to pre-fire states in the Santa Catalina Mountains, Arizona, USA. I used a stratified random design that sampled plots across ecological units and fire severity classes. Tree diameter at breast height (DBH), shrub cover, and seedling and sapling density was recorded by species in five plant communities: oak/pinyon/juniper woodland on hills landscapes of mixed lithology; Madrean pine-oak forest/woodland on granite, gneiss, or metasedimentary rock; Madrean oak/conifer/manzanita on rock outcrops; ponderosa pine forest on granite, gneiss, and similar rocks; and mixed conifer forest on metasedimentary landscapes. Subsets of these data were then used to reconstruct overstory vegetation present when the Bullock (2002) and Aspen (2003) fires occurred. Data from a 1984 pre-fire study was used to substantiate the overstory reconstruction and to determine shrub understory components. I tested the hypothesis that tree mortality was a determinant of post-fire shrub cover, and calculated post-fire importance values (IVs) of tree and shrub components. Ordination and non-metric multidimensional scaling (NMS) of IVs confirmed that overstory reconstruction aligned with 1984 field surveys. Tree mortality was a predictor of post-fire shrub cover, but only with certain species in specific ecological units. Ordinations indicated that tree composition in post-fire plots has diverged from that in pre-fire plots in all but the oak/ pinyon/juniper community. Ordination of shrub components indicated novel configurations of post-fire communities, including association of pre-fire mixed conifer elements with oak woodland elements. The intermixing of tree species in mid- and higher-elevation communities with those historically confined to lower elevation community types suggests that recent fires has disrupted vegetation inertia and initiated novel ecological change. The re-structuring observed within these community types are in agreement with projections that disturbance and climate change will interact to facilitate the spread of lower elevation species to higher elevation zones. Fire x climate interactions may therefore trigger long-lasting changes to ecosystem structure in ways not predicted by models of fire-effects or climate-effects occurring in isolation from each other.
15
Galioto, Thomas Robert. "The influence of elevation on the humic-fulvic acid ratio in soils of the Santa Catalina Mountains, Pima County, Arizona." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/191859.
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An elevational study of organic matter components was made of shallow soils of the Santa Catalina Mountains, Pima county, Arizona. At nineteen elevations (900 to 2700 m), total carbon, extractable organic carbon, humin carbon (tightly bound organic carbon), humic acid carbon, fulvic acid carbon, humic-fulvic acid ratios and E4/E6 ratios were determined. Parameters except the humic-fulvic acid ratios showed high correlations, R² at least .78, with elevation. Of these only the E4/E6 ratio was negatively correlated with elevation. Uncorrelated humic-fulvic acid ratios indicate no proprotional trend of the relative proportions of humic and fulvic acids. The E4/E6 ratio decrease with elevation agreed with all parameters. Humic acids are older, larger and contain higher concentrations of aromatics with increasing elevation. The humic-fulvic acid ratio, based on classical organic matter separation, does not produce a discriptively useful means for a range of climatically different soils. The E4/E6 ratio is more useful in evaluating soil genesis via composition.
16
Krcmaric, Jordan Alexander, and Jordan Alexander Krcmaric. "Geobarometric and Thermochronologic Evidence for a Latest Oligocene Shallow Ductile Detachment System in the Santa Catalina and Tortolita Mountains, Arizona." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/621932.
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The Santa Catalina and Tortolita mountains of Southeast Arizona are footwall exposures of the mid crust, exhumed by a ductile detachment system. Surprisingly little quantitative research has been done to constrain the evolution of this ductile detachment system, despite the reputation of this area as a prime example of a metamorphic core complex. This study presents new evidence for the formation of a shallow ductile detachment system during the latest Oligocene (~25 Ma). Chemical compositions of hornblende-plagioclase pairs were obtained by electron microprobe analysis of 6 samples collected from the Catalina Granite pluton in the northwest Catalina mountains and the Tortolita mountains, and pressure of emplacement is calculated using the aluminum-in-hornblende thermo-barometer. In addition to the pressure data, zircon U-Pb ages were calculated for 4 of the samples. Maximum depth estimates for the emplacement of the Catalina Granite range from an average of 11.3 km in the Tortolita mountains, to 6.6 km in the northwest Catalina mountains. Average temperature of emplacement for the pluton is calculated to be 663°C in the northwest Catalina mountains and 693°C in the Tortoliata mountains. U-Pb age results indicate mean ages ranging from 25.04 to 24.79 Ma (MSWD = 1.7 to 3.9) for each sample, and a combined mean age of 24.91 Ma (MSWD = 2.6). A positive trend between pressure and age is observed for some of the samples. Scatter in the U-Pb ages could be a result of continuous magmatism between 26 and 24 Ma, and the pressure-age trend could be the result of melt migration within the shallow crust. These results suggest that the Catalina ductile detachment system formed at a depth no greater than 8 km due to the thermal incursion produced as the Catalina Granite pluton rose through the shallow crust.
17
Mazaika, Rosemary 1964. "Desert bighorn sheep and nutritional carrying capacity in Pusch Ridge Wilderness, Arizona." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276964.
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The number of desert bighorn sheep (Ovis canadensis mexicana) in Pusch Ridge Wilderness (PRW), Santa Catalina Mountains, Arizona has declined to between 50 and 100 animals. Sheep have restricted movements to the southwest corner of PRW. I developed a model based on nitrogen (N) content of forage and forage quantity to measure seasonal changes in nutritional carrying capacity of sheep use areas in PRW. Forage based estimates of animals numbers were greater for April to September than for October to March. My study suggests that forage is not limiting desert bighorn sheep in PRW and illustrates the potential to support more desert bighorn sheep in PRW than the current population. Seasonal fluctuations in range productivity should be examined in relation to human disturbances proximal to desert bighorn sheep habitat and fire management programs for PRW.
18
Ketcham, Shari Lynn. "Differential Response of Native Arizona Gray Squirrels and Introduced Abert's Squirrels to a Mosaic of Burn Severities in the Santa Catalina Mountains." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/578635.
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Disturbance events can alter habitat properties, leading to species displacement, isolation and/or local extinction. In addition, introduced species have been recognized as a threat to biodiversity of native species. Understanding the interacting impacts of fire on native and introduced wildlife species, and the influence on a native species of competition with an introduced species after ecosystem change is critical. Tree squirrels are indicators of forest health; we used two species to determine thresholds and assess behavioral responses to determine adaption to habitat alterations. We studied native Arizona gray squirrels (Sciurus arizonensis), which are believed to favor riparian habitat, and introduced Abert's squirrels (S. aberti), which prefer open parklike ponderosa pine (Pinus ponderosa) in the Santa Catalina Mountains, Arizona, USA. We examined how native but reportedly declining Arizona gray squirrels and introduced Abert's squirrels use areas within widespread fires that burned the study area in 2002-3. Fires burned in a mosaic pattern of unburned, low, moderate, and high burn severity patches. To determine how fire may affect squirrel habitat and behavior, we examined how fire altered habitat use and occupancy, and used distance sampling to determine squirrel abundance, distribution and use within a mosaic of burn severities. Occupancy and habitat use indicate that introduced Abert's squirrels are better adapted to post-fire conditions whereas native Arizona gray squirrels may be adversely impacted by fire disturbance. Our results suggest that Arizona gray squirrel populations may be locally imperiled due to post-fire habitat alteration and loss exacerbated by competition with Abert's squirrels. Abert's squirrels predominantly occupied unburned ponderosa pine and mixed conifer zones with open understories. In contrast, Arizona gray squirrels were documented at only four sites and primarily occupied unburned to low burn riparian areas with dense understories. Abert's squirrels predominately nest and feed in unburned coniferous areas whereas Arizona gray squirrels nest in unburned to low burn nonconiferous areas. Arizona gray squirrels have a reduced distribution and potentially in decline but only remain at lower elevations on the Santa Catalina Mountains. Fire management and restoration efforts should include examination of the differential impacts of fire on native and invasive species.
19
Psaltis, June. "Climate response, age distribution, and fire history of a Corkbark Fir (Abies Lasiocarpa Var. Arizonica) stand in the Santa Catalina Mountains, Arizona." Thesis, The University of Arizona, 2001. http://hdl.handle.net/10150/278758.
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The southernmost known North American stand of corkbark fir ( Abies lasiocarpa var. arizonica (Merriam) Lemm.) is found in the Santa Catalina Mountains just north of Tucson, Arizona. Climate response, age distribution, and fire history were studied in this small corkbark fir stand to provide baseline information for future management. Response function analysis indicated April--June precipitation from the current growing season, April--June temperature from the current growing season, November--March precipitation prior to the growing season, and August--October precipitation from the previous growing season as the most highly correlated factor with ring-width variance. Age distribution appeared to be steady state. A fire chronology developed for the corkbark fir site was used to test synchroneity of fire events with previously developed chronologies from nearby sites. Chi-squared analyses indicated significant association of fire years for all sites but not spread of fire from one site to another.
20
Gottfried, Gerald J., Peter F. Ffolliott, and Malchus B. Jr Baker. "Snowpack Dynamics on a Santa Catalina Mountain watershed During a Wet Winter." Arizona-Nevada Academy of Science, 1998. http://hdl.handle.net/10150/296490.
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Haile, Abdi Barre. "Possible water pollution sources in Sabino Creek, Santa Catalina Mountains, Arizona." 1987. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1987_455_sip1_w.pdf&type=application/pdf.
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Holleran, Molly. "Quantifying catchment scale soil variability in Marshall Gulch, Santa Catalina Mountains Critical Zone Observatory." 2013. http://hdl.handle.net/10150/292678.
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The quantification and prediction of soil properties is fundamental to further understanding the Critical Zone (CZ). In this study we aim to quantify and predict soil properties within a forested catchment, Marshall Gulch, AZ. Input layers of soil depth (modeled), slope, Saga wetness index, remotely sensed normalized difference vegetation index (NDVI) and national agriculture imagery program (NAIP) bands 3/2 were determined to account for 95% of landscape variance and used as model predictors. Target variables including soil depth (cm), carbon (kg/m2), clay (%), Na flux (kg/m2), pH, and strain are predicted using multivariate linear step-wise regression models. Our results show strong correlations of soil properties with the drainage systems in the MG catchment. We observe deeper soils, higher clay content, higher carbon content, and more Na loss within the drainages of the catchment in contrast to the adjacent slopes and ridgelines.
23
Sanguinito, Sean Michael. "Investigating the effect of high-angle normal faulting on unroofing histories of the Santa Catalina-Rincon and Harcuvar metamorphic core complexes, using apatite fission-track and apatite and zircon (U-Th)/He thermochronometry." 2013. http://hdl.handle.net/2152/23197.
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The formation and evolution of metamorphic core complexes has been widely studied using low temperature thermochronometry methods. Interpretation of these data has historically occurred through the lens of the traditional slip rate method which provides a singular rate that unroofing occurs at temporally as well as spatially, and assumes unroofing is dominated by motion on a single master detachment fault. Recently, several new studies have utilized (U-Th)/He ages with a higher spatial density and greater nominal precision to suggest a late-stage rapid increase in the rate of unroofing. This analysis is based on the traditional slip rate method interpretation of broad regions of core complexes that display little to no change in age along the slip direction. An alternative interpretation is presented that instead of a change in slip rate, there may have been a change in the style of unroofing, specifically caused by the transfer of displacement from low-angle detachment faulting to high-angle normal faults. Apatite fission-track (AFT), and apatite and zircon (U-Th)/He (AHe and ZHe) analyses were applied to samples from the Santa Catalina-Rincon (n=8 AHe, and n=9 ZHe) and Harcuvar (n=12 AFT, n=16 AHe, and n=17 ZHe) metamorphic core complexes in an attempt to resolve the possible thermal effects of high-angle normal faulting on core complex formation. Samples from the Harcuvars were taken along a transect parallel to slip direction with some samples specifically targeting high-angle normal fault locations. The AFT data collected here has the advantage of improved analysis and modeling techniques. Also, more than an order of magnitude more data were collected and analyzed than any previous studies within the Harcuvars. The AFT ages include a trend from ~22 Ma in the southwest to ~14 Ma in the northeast and provide a traditional slip rate of 7.1 mm/yr, similar to previous work. However, two major high-angle, detachment-parallel normal faults were identified, and hanging-wall samples are ~3 m.y. older than the footwalls, indicating high-angle normal faults rearranged the surface expression of the distribution of thermochronometer ages to some extent. AHe ages range from 8.1 Ma to 18.4 Ma but in general decrease with increasing distance in the slip direction. ZHe ages generally range between 13.6 Ma and 17.4 Ma. A series of unexpectedly young AFT ages (10-11 Ma), given by three complete samples and distinct population modes in others, suggest that some parts of the range underwent a later-stage unroofing event possibly caused by high-angle faulting. Confined fission-track length distributions were measured for Harcuvar samples and modeled using the modeling software HeFTy to infer thermal histories and calculate local cooling rates. These imply a component of steady cooling in some parts of the range, evidence of a different departure from a single-detachment dominated model.<br>text