BIO 3158 Lecture Notes - Lecture 2: Cecum, Ostracoderm, Lamprey
16 Jan 2017
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Document Summary
The history of all these linages is linked with the fact that our planet is very dynamic system: mass extinction. Blue arrows indicate dates of mass extinction. Often mass extinction would mean the disapearance and the reappearance of other groups. Many of the jawless fish dispeared after one mass extinction. This impacts habitats and climates: the greatest diversity of vertebrates is linked wiht events that were non-terestrial and terestrial (changing land mass) Show tracks that were associated which would have been primitive amphibians. Evidence of vertebrates that lived on land, but had features of fish. Mass extinction : 5, with three major ones a short geological time-scale: great controversy over what caused the extinction. Might have been volcanic activity at the same time. For the others, the causes are still unknown: still a drop in number of families. Manicouagan (210 ma: asteroid (5km diam. , crater 100km diameter (62 km visible, not a mass extinction, we know this was a chain.
