GEOL 1100 Chapter Notes - Chapter 2: Asthenosphere, Supercontinent
Document Summary
Iv. fit of the continents a: paleontology (fossils of the same type were found in different areas); [rafting hypothesis (animals hang to drifting wood and are carried across it), isthmian hypothesis (land bridge), island stepping stones all supposed to explain it but nothing made sense but continental drifts, geological matches: mountain belts, age similarities, stratigraphic similarities, igneous provinces, paleoclimate evidence: ice sheets covered big areas of the southern hemisphere; same age glaciers are found in different areas, objection to continental drift hypothesis: lack of mechanism for moving continents; wegener incorrectly suggested continents break through ocean crust. Deep ocean trenches of the seafloor gradually consumed as they descend into the mantle: evidence to support hess, vine matthew hypothesis: magnetic reversals represent poles switching; lava solidifying at this point becomes magnetized with opposite polarization they had before (reverse polarity, establishes magnetic time scale with dimensions called chrons , research proves hess"s theory is correct!
