EARTHSC 1122 Lecture Notes - Lecture 30: Avalonia, Baltica, Paleozoic
4 Dec 2015
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Chapter 10: paleozoic world (animals inherit the earth) Paleogeography: laurentia (north america-greenland, n. ireland, scotland, w. norway). Rotated 90 degrees from present position: siberia. High southern latitudes: gondwana (mostly southern hemisphere continents, some of europe, se usa). Took up half the earth aka southern hemisphere: avalonia (some of e. usa-maritime canada). Rising sea level: development of epeiric seas: shallow seas covering the continental shelves. Cambrian life forms: marked improvement in the fossil record, burrowers, trichophycus pedum: marks base of cambrian system small shelly fossils. Biomineralized structures shelly fossils: trilobites (part of the arthropods, brachiopods, sponges, including archaeocyaths (know this name) (reef-builders) reefs are important because many of them are used for oil, mollusks, hyoliths first chordates.
