GEOG 40 Lecture Notes - Great Slave Lake, Giant-Impact Hypothesis, Hadean
Document Summary
The making of the solar system (4. 6 bya: this is called the solar nebular hypothesis, the solar nebular hypothesis describes the formation of our solar system from a nebula cloud made from a collection of dust and gas. The precambrian eon lasted from 4. 6 billion to 540 million years ago. This is 88% of earth"s history: this includes three of the four major eons: the hadean eon, archean eon, and proterozoic eon. It is called the precambrian because it came before the cambrian period when shelly fossils became abundant in the rock record. Hadean eon: 4. 6 - 4. 0 billion years: during the hadean eon, the initial formation of the earth took place, the first step was the aggregation of dust and gases. Great slave lake: erosion and plate tectonics has probably destroyed all of the solid rocks that were older than 3. 8 billion years, the advent of a rock record roughly marks the beginning of the archean eon.
