By Anthony D. Barnosky
This booklet chronicles the invention and research of animal fossils present in the most vital paleontological websites within the world-Porcupine Cave, positioned at an elevation of 9,500 ft within the Colorado Rocky Mountains. With tens of hundreds of thousands of pointed out specimens, this website has develop into the major resource of knowledge at the fauna of North America's greater elevations among nearly 1 million and 600,000 years in the past, a interval that observed the development and retreat of glaciers a number of occasions. before, little has been understood approximately how this dramatic weather switch affected existence through the heart Pleistocene. as well as providing cutting-edge facts from Porcupine Cave, this research additionally provides groundbreaking research on what the knowledge from the positioning express in regards to the evolutionary and ecological changes that happened during this interval, laying off mild on how one of many world's such a lot urgent environmental concerns-global weather change-can impression existence in the world. 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
At no time during the excavation process were well-stratified sediments found. Only weakly defined cementation zones and color bands were observed. Deep open holes were common beneath angular boulders. It is apparent that although relatively old faunal elements occur in this locality, the fauna is mixed due to reworking and irregular depositional processes. As of the end of 2000, the Denver Museum of Nature and Science held 4443 catalogued specimens from this locality. 3, Site 23) LO C AL IT Y N U M B E R DMNH 1350.
Farther in than Fissure Fill A). Material was sampled in the same way as described for Fissure Fill A, although much less volume of Fissure Fill B was sampled because it was less rich in bone. , in the roof of the adit heading toward the surface). 3, Site 11) COL L ECT ION PROTOCOLS This collection was made by DMNH crews led by Don Rasmussen in the southeast corner of the Gypsum Room. The deposit appeared to be an ancient wood rat midden against the wall. 8 m3 of sediment was removed and screened on the spot and only visible bones were saved.
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