geo ch.2 notes

geo ch.2 notes - Ch.2 - Plate Tectonics Key Figures :...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Ch.2 - Plate Tectonics Key Figures : changed the way we look at the Earth Alfred Wegener J. Tuzo Wilson Harry Hess Antonio Snider-Pellegrini : 1858 he looked at maps and saw they seemed to fit together Continental Drift : the hypothesis that continents are mobile Proposed by German meteorologist, Alfred Wegener He published The Origins of Oceans and Continents in 1915 he hypothesised a former super continent, Pangaea idea was founded on strong evidence - fit of continents- location of glaciations- fossil organisms - rock type and structural similarities - paleoclimates preserved in rocks Wegeners idea was debated and ridiculed- most scientists didnt believe him- lack of a mechanism for drift a major criticism Wegener died in 1930 at age of 40 lacking an advocate, the drift hypothesis faded the idea was revived in the 1950s Continental Fit : Wegener noted that continents seemed to fit together he argued the fit could not be coincidental present shorelines make a rough fit the continental shelf edges make a better fit Glacial Evidence : Permian glacial till is found on 4 continents the tills in Africa and India are now near the equator A cooler earth? No. Permian tropical plants are known Paleoclimactic Evidence : Placing Pangaea over the Permian South Pole He correctly predicted where to find:- tropical coals- tropical reefs- subtropical deserts - subtropical evaporites Fossil Evidence : Identical fossils found on widely separated landmasses- Mesosaurus : freshwater reptile found in Africa and South America - Glossopteris : subpolar plant with heavy seeds found on every continent - Lystrosaurus : non-swimming...
View Full Document

Page1 / 8

geo ch.2 notes - Ch.2 - Plate Tectonics Key Figures :...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online