GEOL 1020 Lecture Notes - Lecture 23: Rodinia, Tian Shan, Unconformity
7 Dec 2017
School
Department
Course
Professor
Document Summary
Despite decades-long drilling operations, geoscientists have not yet reached the. However, there are other ways to study earth"s lower crust and upper mantle, including the study of . Ophiolites are hypothesized to represent a snippet of the moho at earth"s surface. By early eocene time, the rocky mountains stood high laramide rockies, due to laramide orogeny. But, were soon eroded, by the late eocene. This is evidenced by a sub- summit surface (textbook page 471) Beginning in the late eocene (~37 ma), the sub-summit surface was blanketed by the white river group (eocene - oligocene in age) A lot of sediment that makes up the white river group is very fine- grained (powdery) and well sorted. By the wind, which is the most selective of transport mechanisms, producing very well sorted sediment. White river group is known for its fossil mammals.
