By Anthony D. Barnosky
This ebook chronicles the invention and research of animal fossils present in probably the most very important paleontological websites within the world-Porcupine Cave, positioned at an elevation of 9,500 toes within the Colorado Rocky Mountains. With tens of millions of pointed out specimens, this website has turn into the most important resource of knowledge at the fauna of North America's better elevations among nearly 1 million and 600,000 years in the past, a interval that observed the development and retreat of glaciers various occasions. formerly, little has been understood approximately how this dramatic weather swap affected existence through the heart Pleistocene. as well as featuring cutting-edge facts from Porcupine Cave, this examine additionally provides groundbreaking research on what the information from the positioning convey concerning the evolutionary and ecological alterations that happened during this interval, laying off mild on how one of many world's so much urgent environmental concerns-global weather change-can impact lifestyles on the earth. Illustrations: fifty eight b/w images, seventy six line illustrations, fifty seven tables
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Extra resources for Biodiversity Response to Climate Change in the Middle Pleistocene: The Porcupine Cave Fauna from Colorado
Probably Irvingtonian. Unknown. Probably Irvingtonian. Mixed. Contains specimens of potential Blancan age as well as Irvingtonian. At least as old as levels 4 and older in the Pit; possibly older. Unknown. Probably Irvingtonian, possibly a Blancan component. Mixed. Contains fossils indicating correlation with older Pit levels alongside a modern match. Unknown. Probably Irvingtonian. Unknown. Probably Irvingtonian. Unknown. Probably Irvingtonian. Unknown. Probably Irvingtonian. Unknown. Probably Irvingtonian.
Depositional dips of about 10° are common and exhibit a radial pattern. It is likely that alternation of moist and dry conditions defined variable patterns of filling, resulting in the establishment of bedding patterns. Overall the package of strata becomes finer upward, suggesting [that] the orifice supplying sediments gradually became clogged or cut off. DMNH 644 was sampled for paleomagnetic analysis in 1993, 1994, and 1995. Analysis of the samples is reported by Friedmann and Raynolds [chapter 6], and compared to biostratigraphic indicators by Barnosky and Bell [chapter 7].
Eighteen stratigraphic horizons (A at top, R at bottom). Biostratigraphically and sedimentologically horizons A–C appear younger than 780 Ka. Paleomagnetic data suggest a reversal in level D. Therefore, levels D–M may date to between 780 Ka and 1 Ma. Mixed. Probably Irvingtonian, possibly a Blancan component. Unknown. Material still under analysis. Mixed. Most material probably Irvingtonian; fauna strongly suggests a Blancan component is also present. Unknown. Unknown. Probably Irvingtonian. note: Supporting evidence for geological ages is presented by the references cited in the text.
Biodiversity Response to Climate Change in the Middle Pleistocene: The Porcupine Cave Fauna from Colorado by Anthony D. Barnosky