ESC 1000 Lecture Notes - Lecture 2: Overburden Pressure, Glossopteris
Document Summary
Lines of evidence for wegener"s continental drift hypothesis: fit of continents- fit together like a puzzle, glacial deposits (till) and striations- sediment trapped and dragged by a glacier acts like a rasp, cutting into continental rocks. 3)glaciations- distributed amongst different continents: fossil distribution- fossils of different prehistoric animals are distributed amongst different continents, climate belts, lithology- once connected and later broken apart. The earth was once a super continent called pangea, all land was together. Alfred wegener published for decades but the problem was he has no mechanism to prove it, just. 1960s data began to accumulate support an earth with rigid plates over ductile mantle. Fossils of this fern were found in all souther continents, showing that they were once joined. An object is under stress when a force is applied to it. The deformation resulting from stress, the change in shape. May or may not be permanent based on the amount of stress and the material properties.
