GEOL 102 Lecture 10: Unit 4 Lecture 10
Document Summary
Not very effective at reproduction (only once a year with 1-4 eggs) Organisms with very different biology, but that live in similar environments, end up looking much alike with continued adaptation. Moving to a modern plate arrangement (2 big arrangements: tectonic isolation of land masses, cooling of environment, 1st in the southern hemisphere (circum-polar, 2ns in the northern hemisphere. Laurasian fauna: northern hemisphere (north america, europe, asia, grasslands developed (savannahs, entirely placentals, only certain groups. Gondwanan fauna: southern hemisphere (south america, africa, antarctica, australia, india, jungle habitats, monotremes, marsupials (platypus, kangaroo, some placentals. Trans gondwanan migration: early cenozoic, early in pangea breakup, circum-polar current. Before continental separation, we see marsupial migration from south america to. After circum-polar current: ice buildup on antarctica and extinction of marsupials there. Old world interchange: exchange of laurasian and gondwanan fauna. To north: sloths, opossums, porcupines, armadillo, elephants.
