The Geology Book Study Guide .
1. Since scientists cant travel to the earths past, how do they know what happened in the past?
2. What are the two basic ways of thinking about the unobserved past?
3. What is the slogan of the principle of uni
Lecture, Pangaea and Diversity
Pangaea (formed in the late Paleozoic era)
Would a single, large landmass have greater diversity then
several large landmasses separated by oceans?
How diverse has life been ?
There might have been as many as 10 billion s
Lecture, Life Before Animals
PSB-S 2712 WED. 7PM STUDY SESSION
When did Life Originate on Earth?
When was the Earth habitable ?
Liquid water by 4.4 Ga
Heavy bombardments (asteroids and comets)
Greatest 4.1 to 3.8 Ga (evidence from moon)
Earth was a lousy
Lecture, Marine Life
The Cambrian Explosion
Within a few tens of millions of years, animals diversify at
the phylum, class, and order level
Most phyla probably had few species
This pattern is unique
a. Because water is such a powerful solvent many compounds can be
Lecture 1: 3/30/2009
Penguins are dinosaurs, birds are dinosaurs Dinosaurs are not extinct, many did become at the end of the Crustaceous Dinosaur: a well defined group (they share a unique set of characteristics that uniquely distinguishes t