BIO 1130 Lecture Notes - Lecture 5: Phanerozoic, Late Heavy Bombardment, Geologic Time Scale

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

A system of chronological dating, a means of mapping the history of the earth. Combines estimates of the age of geological formations and events in rock record. The earliest geologic eon in the history of the earth (4600 3800ma, 800years). Hadean eon leads to the formation of the solar system and planets: eon begins with the big bang, water then appears on planet earth after it cooled, eon ends with first forms of life appearing in water. Eon (3800 2500ma) after hadean eon: anaerobic bacterial life (single celled prokaryote) that can produce atp appear. via atp synthase and proton gradient bacteria get protons from compounds in environment (ex. Co2) bacteria arise that can split proton from water (water sourced protons are high energy = more. Eon when: begins to appear: oxygen atmosphere appears, single celled aerobic bacteria and single celled eukaryote cells (protozoans) appear in ocean. Eon (543ma to present time) after proterozoic eon: eon when multicellular organisms appear.