lec 6 - Dating the Major Events of Life www.toyen.uio.no/...

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1 Dating the Major Events of Life www.wooster.edu www.antique-pocket- watch.com 2 Timing of Ancestry www.toyen.uio.no/ Teeth adapted from Savage & Long (1986), p. 157 3 Geologic Time Scale • Documents history of life (see Fig. 26.9) • Relative dating • Absolute dating Campbell & Reece Table 25.1 4 Age of the Earth • Prevailing Western views prior to Darwin • Earth very young – a few thousand years • Catastrophism – apparent age of geological features reflects different rates in the past • Species immutable Campbell & Reece Fig. 22.4
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5 Age of the Earth • 1800s – uniformitarianism replaces catastrophism • Earth must be very old • Geological processes act for very long periods of time web.njit.edu 6 Relative Dating • Geostratigraphy – sequence of geological events (= strata) Knoll, A. 2003. Life on a Young Planet 7 Relative Dating • Geostratigraphy – allows correlation of widespread strata from different locations • E.g., the KT iridium layer Italy Newfoundland www.mala.bc.ca/~earles/kt-quick-apr01.htm 8 Relative Dating • Biostratigraphy – sequence of biological events • E.g., index species – ‘Cambrian revolution’ www.stephenjaygould.org www.accessexcellence.org/ bioforum/bf02/lipps/bf02c3.html Siberia
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lec 6 - Dating the Major Events of Life www.toyen.uio.no/...

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