| Abstract: | There is a general inverse relationship between the natural logarithm of tooth area (a body size indicator) of some fossil mammals and paleotemperature during approximately 2.9 million years of the early Eocene in the Bighorn Basin of northwest Wyoming. When mean temperatures became warmer, tooth areas tended to become smaller. During colder times, larger species predominated; these generally became larger or remained the same size. Paleotemperature trends also markedly affected patterns of local (and, perhaps, regional) extinction and immigration. New species appeared as immigrants during or near the hottest (smaller forms) and coldest (larger forms) intervals. Paleotemperature trend reversals commonly resulted in the ultimate extinction of both small forms (during cooling intervals) and larger forms (during warming intervals). These immigrations and extinctions mark faunal turnovers that were also modulated by sharp increases in sediment accumulation rate. |
| Genre: | Article |
| ProdID: | 70017669 |
| Citation Author: | Bown, T. M.; Holroyd, P. A.; Rose, K. D. |
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| Citation End Page: | 10406 |
| Citation Issue: | 22 |
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| Citation Language: | English |
| Citation Larger Work Title: | Proceedings of the National Academy of Sciences of the United States of America |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Mammal extinctions, body size, and paleotemperature; 1994; Article; Journal; Proceedings of the National Academy of Sciences of the United States of America; Bown, T. M.; Holroyd, P. A.; Rose, K. D. |
| Citation Start Page: | 10403 |
| Citation Volume: | 91 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Mammal extinctions, body size, and paleotemperature; 1994; Article; Journal; Proceedings of the National Academy of Sciences of the United States of America; Bown, T. M.; Holroyd, P. A.; Rose, K. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1073/pnas.91.22.10403 |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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