Continental Drift & Plate Tectonics

Notes de l'éditeur

1. Yet still it moves! (mu-ov-ay)
3. Introductory textbook. Earth sciences are now like physics?
4. Earth was more violent in the past
5. Evidence for contraction? Cracking such as this in Iceland
6. By 1904 ...
8. Worked in Grand Canyon area
9. Mesozoic: 251 - 65 mybp; problem to solve: similarity of S Am and African fauna / Cynognathus / Mesosaurus (FW not Marine) / Glossopteris
10. Mesozoic: 251 - 65 mybp; problem to solve: similarity of S Am and African fauna / Cynognathus / Mesosaurus (FW not Marine) / Glossopteris
11. Mesozoic: 251 - 65 mybp; problem to solve: similarity of S Am and African fauna / Cynognathus / Mesosaurus (FW not Marine) / Glossopteris
12. Mesozoic: 251 - 65 mybp; problem to solve: similarity of S Am and African fauna / Cynognathus / Mesosaurus (FW not Marine) / Glossopteris
13. Mesozoic: 251 - 65 mybp; problem to solve: similarity of S Am and African fauna / Cynognathus / Mesosaurus (FW not Marine) / Glossopteris
14. Explained using land bridge / approx 1750 miles … and no trace of the landbridge /How did it sink if it was lighter? / Hidden continent?? / Also fauna of Antarctica, India & Australia!!!!
15. Pioneered the use of weather balloons / Disappeared with a companion. Body found the next year.
16. Work was a unification of geophysics, geology and geography / Translated in 1922
18. Shared uplifts
19. These are just the idea of isostacy.
20. #3 had been held for a long time
21. LHS noticed fit of continents / RHS had a theory of drift due to geological forces / Wegener only learned of these after his theory was in place.
24. Also see this with present day earthworms
25. Contiguous mountain ranges
26. Paleoclimate only makes sense – evidence of glaciers
27. But what was the mechanism?
29. In short, drift was a likely but unproven hypothesis. Response in US was different - we’ll see why
33. doo tooey
34. Unconvincing - how not to write a scientific sentence
35. Arthur Holmes
36. No one paid any attention. / It wasn’t until the after WW2 that evidence began to accumulate.
37. sonography and magnetometers were products of hunt for submarines! / seismographs were installed to monitor underground nuclear tests!
47. It’s the plates that move, not the continents!
48. a rift valley in iceland / the bridge (built in 2002) will actually be slowly ripped apart ~ 4cm per year
50. divergent plate boundary: ridges leading to seafloor spreading convergent plate boundary: subduction @ trenches often with volcanic island arcs on landward side mountains forming (e.g. Rockies and Andes) where continent is riding over a subduction zone.
66. Evidence for ... similarities of pattern and form
67. Evidence for ... quantifiable geophysical evidence; A new kind of evidence that was dependent on Cold War technologies.
68. over CD
71. scientists and historians - effect of Kuhn???