GGR208H5 Lecture Notes - Lecture 9: Nothofagus, Northern Hemisphere, Gymnosperm
Document Summary
Late-cretaceous-tertiary climate, biogeographical regions, the great american exchange. Example: madagascar rodents: there rodents follow under the muridae family, nine endemic genera all part of cosmopolitan muridae family (rats, mice, voles) Is the route from africa or india (to which it was attached during late permian early. In madagascar, there is 1 family, 9 genera, and 21 species. Oxygen-isotopes in fossilized marine shells used to understand past climate: deep oceans 1. 5 c warmer, evidence of warmer climate in antarctic and bering region (alaska-siberia. Rapid rise in sea level, thus inland seas, but fall by late cretaceous. Focusing on cretaceous and early parts of the tertiary period. Evidence suggests that antarctica is what we call the connection between siberia and. Alaska: these areas were habitable, less ice sheets, sea level was high, causing with the warmer climate and hence able to regulate temperature around the world (early cretaceous) Multiple fluctuations throughout, and as we move into tertiary, it starts to cool.
