GLGY 493 Study Guide - Midterm Guide: Kaibab Limestone, Gymnosperm, Paradox Basin
11 Nov 2017
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Evidence: clean quartz sand and grand canyon transgressive sequence. Iapetus ocean narrowing as taconic orogeny takes place. Active margin is beginning to develop on western side of na (subduction zone) Evidence: folded rocks as a result of orogeny in new. Resulting in high sea level in later devonian. Antler orogeny = initiated in devonian with subduction of oceanic lithosphere beneath the western margin of the continent. Western laurasia, seeing extensive reef formation along western margin and restricted circulation within the reef encircled basins (evidence: evaporites) Gondwana was cool sat on top of south pole. Mississippian forming a world wide unconformity between mississippian and pennsylvanian. Decreased siliciclastic input allowed for widespread carbonate deposition in kaskaskia sea. Alleghanian orogeny begins, forming final parts of appalachian mountains and. Nw africa collided with se na to build. Appalachians, formed metamorphic and igneous complexes overlying flat lower. Antler orogeny = volcanic arc has collided with western margin of.
