GEOL 1020 Lecture Notes - Lecture 39: Deccan Traps, Siberian Traps, Paleogene

• School: CU-Boulder
• Department: Geological Sciences
• Course: GEOL 1020
• Professor: Stephen Mojzsis

Document Summary

A major extinction occurred at the end of the period. Numerous evolutionary radiations occurred during the cretaceous (144-65 ma) ~65% of all species died in the end-cretaceous (k-t) extinction. Mammals had to reconstruct the food chain. Evidence for the cause of the extinctions: huge la(cid:448)a flo(cid:449)s i(cid:374) i(cid:374)dia (cid:894)de(cid:272)(cid:272)a(cid:374) traps(cid:895) aki(cid:374) to that fou(cid:374)d at the e(cid:374)d per(cid:373)ia(cid:374) (cid:894)si(cid:271)eria(cid:374) traps(cid:895, worldwide clay layer with unusual properties (this has not been verified for the permian- Dinosaur rates show that they were not declining. At the end of the cretaceous, there is a worldwide layer of clay that covers the world. Most of these places are under water. When these lava pockets happen, they jam the atmosphere with sulfur and co2 (end of the. Permian: this happened because of the lava reaching the surface and reaching a pocket of coal and burned it! Cools because you increase amounts of areoles in the atmosphere.