EESA06H3 Lecture Notes - Lecture 8: Sulfur, Clastic Rock, Igneous Rock
Document Summary
Layer cake diagram has the 4 layers of ontario geology. Most rocks in layer 1 are metamorphic; made when old plates came together and formed old mountains that no longer exist. Gneiss rock on the way to sudbury is the roots of old chain of mountains that have been worn away by erosion. May collisions happened to form the craton/core of north america. Layer 2 was the mountainous surface and was located near the equator. Over time the erosion wore down layer 2 until it was relatively flat; peneplanation (rugged surface that was worn down to being almost flat) Coral reef started to form and created limestone on layer 2; has lots of sedimentary rocks. Bits of rock that are eroding off of the mountains are deposited into the shallow seas with the coral reef and smothers them; forms clastic sedimentary rocks such as sandstone and shale. Layers of repetitive rocks- inter-bedding (repeated cycles of rock types)
