BIO211H5 Lecture Notes - Amniote, Yolk Sac, Lungfish
Document Summary
Rise of fish and the evolution of amniotes. We ll talk about the devonian, which was from 417-354 million years ago, and the carboniferous, which lasted from 354-290 million years ago. Cambrian, ordovician, silurian are used by geologists internationally as a tool to communicate with each other. These time periods are defined by actual historical events, primarily extinctions. What happens is that not everybody always agrees as to what a time period should be called. The carboniferous is a stretch of time which, in north america, is divided into two subdivisions, the. Mississippian (354-323 million years ago), and the pennsylvanian (323-290 million years ago). They don t have this division in europe and asia. When we last talked, we re talking about the devonian. In the devonian, we still have the same arrangement of continents. We have an equatorial laurasia, and a southern gondwana. Canada at this time is a large volcanic island.
