GSC 111 Lecture Notes - Lecture 15: Euramerica, Avalonia, Baltica
26 Nov 2017
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Document Summary
Early (430 ma) and middle (425 ma) silurian the north collide with euramerica. Avalonia in the southern an baltica in. Second interval of mountain building in the appalachian (eastern north america) region. Middle silurian and early devonian: suturing of baltica and avalonia in north america and. Suturing responsible for caledonide mountains on w. coast of norway. Exotic terranes accreted to eastern north america. 2nd great depositional cycle in the appalachians. Formation of large carbonate platform on the passive margin. Formed from sediments shed from highlands in the east. Accretion of island arc onto western north america. Evidence found in north carolina an nevada. At most 160 km of displacement on thrust faults. Other groups underwent new adaptive radiation to fill open niches. Bivalve molluscs invade nonmarine habitats (upper devonian) Graptolite species exponentially increase in 5 my. Coral stromatoporoid reef diversity and size outgrows ordovician reefs. Silurian tabulate and rugose corals in michigan basin.
