Anthony D. Barnosky, Christopher J. Bell, Robert G. Raynolds, and Louis H. Taylor
- Published in print:
- 2004
- Published Online:
- March 2012
- ISBN:
- 9780520240827
- eISBN:
- 9780520930858
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520240827.003.0002
- Subject:
- Biology, Evolutionary Biology / Genetics
Porcupine Cave is the richest source of information on Irvingtonian-age vertebrates. Hundreds of thousands of vertebrate fossils have been recovered from Porcupine Cave, with thousands of ...
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Porcupine Cave is the richest source of information on Irvingtonian-age vertebrates. Hundreds of thousands of vertebrate fossils have been recovered from Porcupine Cave, with thousands of identifiable specimens from the Pit and Velvet Room localities. This chapter documents the spatial distribution of the many different fossil localities and provides an overview of their suspected geological ages and general taphonomic settings. Most of the material described in this book was recovered from seven localities: the Badger Room, Fissure Fill A, the Gypsum Room, the Pit, and three spatially distinct excavations in the Velvet Room (Mark's Sink, DMNH 644, and CM 1927/UCMP V93175). Of these, the Pit locality provides the main basis for interpreting the effects of middle Pleistocene environmental change on ecology and evolution.Less
Porcupine Cave is the richest source of information on Irvingtonian-age vertebrates. Hundreds of thousands of vertebrate fossils have been recovered from Porcupine Cave, with thousands of identifiable specimens from the Pit and Velvet Room localities. This chapter documents the spatial distribution of the many different fossil localities and provides an overview of their suspected geological ages and general taphonomic settings. Most of the material described in this book was recovered from seven localities: the Badger Room, Fissure Fill A, the Gypsum Room, the Pit, and three spatially distinct excavations in the Velvet Room (Mark's Sink, DMNH 644, and CM 1927/UCMP V93175). Of these, the Pit locality provides the main basis for interpreting the effects of middle Pleistocene environmental change on ecology and evolution.
L. Barry Albright, III
- Published in print:
- 2000
- Published Online:
- March 2012
- ISBN:
- 9780520098367
- eISBN:
- 9780520915985
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520098367.003.0001
- Subject:
- Biology, Evolutionary Biology / Genetics
The first geologic study of the San Timoteo Badlands was conducted by Childs Frick between 1916 and 1921. Frick launched the reconnaissance as part of an extensive University of California study on ...
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The first geologic study of the San Timoteo Badlands was conducted by Childs Frick between 1916 and 1921. Frick launched the reconnaissance as part of an extensive University of California study on the “geologic faunal history of the Pacific coast.” The San Timoteo Badlands of the Riverside and San Bernardino counties, California, are govern by approximately 2,000 m of nonmarine sedimentary rocks that span an interval of time represented by three of the four most recent North American Land Mammal “Ages,” the late Hemphillian through the early Irvingtonian. The main goal of the San Timoteo project was to develop a detailed chronostratigraphy that would aid further investigations into the geologic problems of this region. The approach was to develop a magnetostratigraphy for the entire Badlands sequence and to locate a succession of superposed mammalian faunas that would aid in the correlation and calibration of the local magnestostraigraphy to the MPTS.Less
The first geologic study of the San Timoteo Badlands was conducted by Childs Frick between 1916 and 1921. Frick launched the reconnaissance as part of an extensive University of California study on the “geologic faunal history of the Pacific coast.” The San Timoteo Badlands of the Riverside and San Bernardino counties, California, are govern by approximately 2,000 m of nonmarine sedimentary rocks that span an interval of time represented by three of the four most recent North American Land Mammal “Ages,” the late Hemphillian through the early Irvingtonian. The main goal of the San Timoteo project was to develop a detailed chronostratigraphy that would aid further investigations into the geologic problems of this region. The approach was to develop a magnetostratigraphy for the entire Badlands sequence and to locate a succession of superposed mammalian faunas that would aid in the correlation and calibration of the local magnestostraigraphy to the MPTS.
Kristina A. Schierenbeck
- Published in print:
- 2014
- Published Online:
- January 2015
- ISBN:
- 9780520278875
- eISBN:
- 9780520959248
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520278875.003.0012
- Subject:
- Environmental Science, Nature
The mammal fauna of California was significantly shaped by Beringian migrations that occurred episodically from the Eocene through the late Pleistocene. Wide-dispersing mammals show evidence of ...
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The mammal fauna of California was significantly shaped by Beringian migrations that occurred episodically from the Eocene through the late Pleistocene. Wide-dispersing mammals show evidence of continental divisions across North America, with western clades retreating variously to the coast or ice-free regions during glaciation periods. For small mammals, deep phylogeographic divergence is common due to vicariant events, and due to their limited dispersal, they often remained isolated. Severe habitat loss and degradation in the past few centuries has decimated many populations that occur in riparian corridors from east to west, further isolating historically contiguous populations and preventing migration. Barriers to dispersal existed in the Monterey Bay region from about 8–2 Ma, because the southern Sierra Nevada drained into the Pacific Ocean from this location and presented a significant obstacle for the dispersal of small mammals. The central Sierra Nevada, southern Sierra Nevada (particularly around the San Joaquin River), the outer Coast Ranges (particularly around the San Francisco Bay south to Monterey), San Bernardino Mountains, Tehachapi Mountains, Peninsular Ranges, and Inyo Valley are identified as focal areas for endemic taxa. A number of studies now verify that divergence for a number of taxa from the warm deserts began in the Miocene east of the Mojave.Less
The mammal fauna of California was significantly shaped by Beringian migrations that occurred episodically from the Eocene through the late Pleistocene. Wide-dispersing mammals show evidence of continental divisions across North America, with western clades retreating variously to the coast or ice-free regions during glaciation periods. For small mammals, deep phylogeographic divergence is common due to vicariant events, and due to their limited dispersal, they often remained isolated. Severe habitat loss and degradation in the past few centuries has decimated many populations that occur in riparian corridors from east to west, further isolating historically contiguous populations and preventing migration. Barriers to dispersal existed in the Monterey Bay region from about 8–2 Ma, because the southern Sierra Nevada drained into the Pacific Ocean from this location and presented a significant obstacle for the dispersal of small mammals. The central Sierra Nevada, southern Sierra Nevada (particularly around the San Joaquin River), the outer Coast Ranges (particularly around the San Francisco Bay south to Monterey), San Bernardino Mountains, Tehachapi Mountains, Peninsular Ranges, and Inyo Valley are identified as focal areas for endemic taxa. A number of studies now verify that divergence for a number of taxa from the warm deserts began in the Miocene east of the Mojave.