EARTHSC 1122 Lecture Notes - Lecture 28: Pannotia, Plate Tectonics, Proterozoic
4 Dec 2015
School
Department
Course
Professor
Document Summary
Increase in oxygen is a result of increase of stromatolites (blue/green bacteria) Development of continents: proterozoic: platform stage, crust well differentiated, plate tectonic processes operating. stable continents provided a place for weathering, erosion, and deposition. Proterozoic supercontinents: two? supercontinents (rodinia- 1. 6 g. a, pannotia- 700 ma) supercontinent breakup at the end of the proterozoic led to paleozoic continents: gondwana, Atmospheric evolution: red beds: terrestrial sediment, red color comes feo in sediments (rust) [1. 9 ga to. Oceans were partly covered in sea ice: due to countering of the warming effects of greenhouse gases; clustering continents near the. Origin of oxygen in atmosphere: mostly due to photosynthesis (cyanobacteria, chemical dissociation of carbon dioxide (by uv radiation, an oxygen-poor atmosphere was critical to the evolution of life. Eukaryotes ( true cells: large, single-celled to multicellular, have a nucleus, reproduction by mitosis and meiosis (sexual reproduction, everything that isn"t bacteria and archean, protoctists; plants, animals, fungi.
