EARTHSC 1G03 Lecture Notes - Lecture 13: Landform, Crinoid, Taconic Mountains
7 Oct 2016
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4 layers: layer iv the build landscape. Human sedimentology : layer iii glacial deposits, layer ii paleozoic cover. Shield covered by younger sedimentary rocks in southern ontario. 400 million years old: layer i the canadian shield (basement) Formations: distinctive rock units that can be mapped over a large area: usually named after a type locality where the rocks were first described, sub-divided into members, lumped together to form groups. Paleozoic rocks are exposed along the niagara escarpment: limestones, dolostones, and shales, 400-500 million years old, relatively flat-lying sedimentary rocks, slight dip to the south. Gradual slopes = shale: limestones & dolostones: Crinoids plant-like animals (if whole, likely to have died in calm, deep water: sandstones and shales from erosion of highlands: Large deltas formed by rivers draining the taconic mountains. As a landform, the niagara escarpment is young: formed by glacial and fluvial erosions. More easily eroded rocks below (rochester shale)
