By Anthony D. Barnosky
This e-book chronicles the invention and research of animal fossils present in essentially 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 main resource of data at the fauna of North America's larger elevations among nearly 1 million and 600,000 years in the past, a interval that observed the improvement and retreat of glaciers a number of occasions. before, little has been understood approximately how this dramatic weather swap affected existence throughout the heart Pleistocene. as well as providing cutting-edge info from Porcupine Cave, this learn additionally offers groundbreaking research on what the knowledge from the location 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 impression lifestyles on the earth. Illustrations: fifty eight b/w pictures, seventy six line illustrations, fifty seven tables
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Additional resources for Biodiversity Response to Climate Change in the Middle Pleistocene: The Porcupine Cave Fauna from Colorado
Levels did not always follow natural lithologic breaks, and because of the complex stratigraphy and slope of the deposit, these “microlevels” are not correlative from one grid to the next (for example, level 5 in grid 5 could be a different age than level 5 in grid 17). 9 Plan view of excavation grids for DMNH 644, Velvet Room. 10. (Drawn by D. 2). 54 cm. The resulting fossiliferous matrix was taken to the DMNH for extraction of specimens by volunteers. Details about the DMNH excavation that will be pertinent to future analyses of the fossils were provided by RGR and LHT (pers.
Excavation continued through the 1997 field season, ending when large boulders were encountered at the base of the site. Excavation was carried out by volunteers (most from the Western Interior Paleontological Society) under the direction of Don Rasmussen, Robert Raynolds, and Lou Taylor. 9). ) thick. Levels did not always follow natural lithologic breaks, and because of the complex stratigraphy and slope of the deposit, these “microlevels” are not correlative from one grid to the next (for example, level 5 in grid 5 could be a different age than level 5 in grid 17).
Levels 1–3 (1 being the top) are thought to date near 800 Ka, but are potentially as young as 250 Ka. Levels 4–12 probably date to somewhere between 780 and 950 Ka. Level 14 is probably younger than 1 Ma. Unknown. Probably Irvingtonian. Unknown. An amberat-stained wood rat midden (Trailside Nest) was dated to 2180 ± 80 yr. Reddish sediments from the floor yield a Camelops (camel) metapoidal and may be Irvingtonian. 3 Synonymous Institutional Numbers Velvet Room, CM Excavation 19 CM 1927 UCMP V93175 Velvet Room, DMNH Excavation 20 DMNH 644 Velvet Room, Kate’s (=Katie’s) Cupola Velvet Room, Last Chance Pit Velvet Room, Mark’s Sink Velvet Room, Will’s Hole Porcupine Cave, undifferentiated 21 DMNH 1349 24 DMNH 2433 22 DMNH 1349 23 DMNH 1350 — CM 1932 DMNH 1354 UCMP V97002 Comments and Approximate Age Seven stratigraphic levels are recognized.