Evolution of the northwestern margin of the Basin and Range: The geology and extensional history of the Warner Range and environs, northeastern California

Egger, Anne E.; Miller, Elizabeth L.

doi:10.1130/ges00620.1

Cited by 23 publications

(30 citation statements)

References 138 publications

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“…This is consistent with our new mapping ( Fig. 3; Egger and Miller, 2011), and we suggest that another vent may exist between Cedar Pass and Cedar Mountain, where reworked blockandash flow deposits contain lava blocks as much as 2 m across and are intruded by a porphyritic ande site body that is exposed in roadcuts at Cedar Pass (Fig. 3).…”

Section: Cedar Pass Complex (266-245 Ma)supporting

confidence: 90%

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et al. 2011

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Section: Cedar Pass Complex (266-245 Ma)supporting

confidence: 90%

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et al. 2011

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“…Geological boundaries afterEgger and Miller (2011), radiometric dates ofAxelrod (1966),Myers (1998), andColgan et al (2011).…”

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confidence: 98%

A mid-Oligocene (Whitneyan) rhinocerotid from northeastern California

2015

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Rhinoceroses were important in North American mammal faunas from the late middle Eocene to the Miocene, but the group’s poor sampling outside the High Plains and eastern Rocky Mountain regions during their early evolution significantly hinders understanding of their biogeography. This limited geographic sampling is particularly true of early–middle Oligocene time, with the vast majority of Whitneyan localities occurring in the White River Badlands of South Dakota. Thus, any rhinocerotid from outside the High Plains during this period is significant. We describe two new rhinocerotid specimens from the middle Oligocene Steamboat Formation of the northeastern Warner Mountains of California. Although the Steamboat Formation is well known for fossil plants, this is the first report of mammalian fossils from the area: an isolated lower molar recovered in 1974 but not previously described or illustrated, and a mandibular fragment recovered approximately 20 years later and bearing two molar teeth, most likely pertaining to the same taxon and horizon. The lack of distinctive morphological characters suggests both fossils be conservatively referred to Rhinocerotidae incertae sedis. Based on published tooth measurement data, Trigonias osborni represents the closest size match, but that species is currently only known from the Chadronian. Similarly, the Whitneyan taxon Diceratherium tridactylum is approximately the right size, but is currently only known from the High Plains and its presence in California would expand its geographic range substantially. Of greatest importance here is that sediments of the eastern Warner Mountains may represent a largely unexplored locale for early–middle Oligocene fossil vertebrates, and may yield important future finds.

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“…The N-S trending valley is a high altitude desert with three seasonal playa lakes. Surprise Valley is bounded on the west by the Surprise Valley fault, but the eastern margin is more complex, and the valley transitions from a full-graben in the south to a half-graben in the north (Personius et al, 2008;Egger et al, 2009;Lerch et al, 2009;Egger and Miller, 2011). The accommodation zone between the half-graben in the north upper lake basin and the full graben in the middle and lower lake basins contains the most lake-related features, such as terraces and visible shorelines sets.…”

Section: Surprise Valley Californiamentioning

confidence: 99%

“…Hydrothermal carbonate deposits can be found around Surprise Valley corresponding to modern and extinct hot springs (Egger and Miller, 2011), but these were avoided. Sampling of lacustrine tufa was not carried out in the vicinity of these hydrothermal deposits to avoid potential sampling tufa that may have been diagentically altered.…”

Section: Sample Collectionmentioning

confidence: 99%

“…The location of the three weather stations used in this study (data summarized in Figure. 3) is denoted by black diamonds. (B) Simplified geological map of the study area (1:60,000), with a Digital Elevation Model (DEM) and USGS 100k topography map used as a baselayer, adapted from Egger and Miller (2011) ArcGIS database and field observations, with observed and inferred faults (black lines), the Reheis (1999b) …”

Section: Geologic and Climatic Settingmentioning

confidence: 99%

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An Assessment of Late Pleistocene to Middle Holocene Lake Level Fluctuations in Surprise Valley, California

Ibarra¹

2018

Preprint

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Knowledge of Earth’s climate history and sensitivity, combined with modeling past and future climate, are central to informing policy decisions regarding future climate change. The hydrologic response to future warming scenarios due to increased anthropogenic CO2 emissions remains uncertain. Freshwater availability in the arid western United States is projected to decrease in availability as increased agricultural, urban and industrial uses continue to stress supplies. Motivated by the potential for dramatic future hydrologic changes, studies recording the abrupt transitions between different equilibrium states of natural past climate variability shed light on our understanding of the modern climate system.The presence of pluvial lakes in the Basin and Range Province, in the western United States, during the late Pleistocene (40 to 10 ka) indicates far greater moisture availability during the Pleistocene glacials. This study investigates the timing and magnitude of the most recent pluvial lake cycle that filled Surprise Valley, California using geophysical, geochemical and geochronologic tools. Spanning 31.2 to 4.6 ka, this new lake level record places the highest lake level, at 180 meters above present day playa, at 13.9 ± 1.2 ka. This age appears to be nearly synchronous with highstands of Lake Lahontan to the south and the Chewaucan Basin to the north. Additionally, most of the Basin and Range lake highstands, including Lake Surprise, follow peaks in precipitation minus evapotranspiration (P-ET) by 8-10 kyr. By compiling a diverse set of paleoclimate data available for western North America, I found that the timing and geographic distribution of lake highstands is inconsistent with increased precipitation in response to shifting westerly winds, the current model for the genesis of large lakes in western North America. Rather, lakes levels are more strongly correlated with changes in summer insolation, suggesting that lake highstands were likely facilitated by colder temperatures and increased humidity due to the presence of continental ice sheets and increased atmospheric convergence. I compared the constraints from lake and soil-based records to Atmosphere-Ocean General Circulation Model simulations from the Paleoclimate Model Intercomparison Project 2. Based on model-proxy intercomparison, the Atmosphere-Ocean General Circulation Models, the same models used to also assess future climatic changes, poorly predict hydrologic quantities for the Last Glacial Maximum.

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Evolution of the northwestern margin of the Basin and Range: The geology and extensional history of the Warner Range and environs, northeastern California

Abstract: ABSTRACT

Cited by 23 publications

References 138 publications

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A mid-Oligocene (Whitneyan) rhinocerotid from northeastern California

An Assessment of Late Pleistocene to Middle Holocene Lake Level Fluctuations in Surprise Valley, California

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