Geology Week 14
Geology Week 14 GEOL1005
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This 2 page Class Notes was uploaded by Kate Notetaker on Thursday April 21, 2016. The Class Notes belongs to GEOL1005 at George Washington University taught by Catherine A. Forster in Winter 2016. Since its upload, it has received 19 views. For similar materials see Historical Geology in Geology at George Washington University.
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Date Created: 04/21/16
April 19, 2016 Glaciation at the poles o Pushing the climatic zones to the equator o A lot of animals need to adapt to the cold Pleistocene Megafauna o Ex. Ground sloths o A lot of the mammals get very very large o Nearly all is extinct, mostly by 10,000 years ago o Only one Pleistocene megafaunal component still alive today Musk ox o Many animals preserved through freezing Browser eating leaves, pulling it off of trees Grazer eating grasses, stuff on the ground How do we know what Pleistocene animals looked like? o Various cave paintings from the Pleistocene Mammoth DNA has been extracted from hair o Entire mitochondrial genome has been sequenced o Based on what they know about the genetics so far It is though to be closely related to the Indian elephant Adapting to the cold o Long fur, thick undercoat Insolation through a lot of hair o Shortened extremities Ears tend to get very small heat is lost through the ears Shorter tails o Increased size In times where its really warm reptiles get large o Or in areas that are equatorial o The warmer it is year round, the more time they have to grow When its cold mammals get big o Endotherms we make our own heat o Losing heat through your skin constantly o Body has to work harder to keep you at a certain temperature How do you conserve your body heat? o Get big o You have to look at the ratio between the volume within your body with the surface area of your body o The greater the surface area to volume ratio, the more your body has to work to keep you warm Tar pits o Asphalt seeps to the surface, becoming soft an sticky in warmer weather o Easy to get stuck here o Preserves animals o Trapped animals would sink into the asphalt o Starve to death o Predators come in to feed on whatever has been trapped “Predator trap” Disproportionate number of La Brea fossils are predators o Since 1875, more than 650 species of plants and animals have been recovered from La Brea Big portion are predators Everything from insects to mammals, large and small
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