EESA06H3 Lecture Notes - Lecture 8: Deep Time, Arthur Holmes, Sedimentary Rock
Document Summary
Stratigraphy-arranging rocks in logical sequence in terms of agefrom greek strata (layer) Layer underneath another is oldernot always (sometimes in rockys rocks are upside down due to plate tectonics) Archbishop ussher-should be able to look through bible to find out earths history of when day 1 was: declared earth was 6000 yrs old, notion that earth was young stood for some time. James hutton: recognized unconformities within layers of rocks and the igneous origin of granite. Hutton also said if u go out, what u see in terms of geologic processes can be used to explain ancient pastuniformitarism or actualism. Facies=appearance oflooks at rocks in detail, they are different: came into conflict with abram werner and diluvialism and catastrophism. This time ppl thought land was due to flood, called divuvialism or catastrophism (abram werner) Hutton unconformitycan see layers but they were horizontal and now are vertical: basic subdivision of rocks, unconformity-surface that separates the two groups of rock, gap.
