GEOL 102 Lecture Notes - Lecture 15: Annelid, Western Australia, Rodinia
Document Summary
Many processes which had started in the archean continued into the proterozoic. Increase in number and type of fossils. Stromatolites become very very diverse and common. Banded iron formations disappear around 2 bya. New sediments were largely oxidized often appearing red from iron oxide minerals. Volcanic arcs formed chains of islands at subduction zones. Continents grew larger from collisions with these arcs and one another- continental accretion. During collisions sediments from shallow seas between continents were compressed and metamorphosed orogenic stabilization. Evidence for components and locations for early continents and supercontinents. Extensive reworking makes understanding the original size and shape of these early continents problematic. Included parts of west australia and south africa. Included parts of africa australia and india. Included parts of north and south america, australia, and. Included parts of canada and and siberia. Included parts of south america and western africa. Included parts of north america and northern europe. Laurentia (north america), siberia, western india, baltica, china,
