Earth Sciences 1083F/G Lecture 12: Lecture 12 - Principles of Geologic Time

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types: y angular: titled rocks overlain by flat-lying rocks y disconformity: strata on either side of the unconformity are parallel y nonconformity: metamorphic or igneous rocks in: correlation of rock layers contact with sedimentary strata. matching rocks of similar ages in different regions known as a correlation. when the organism dies, the amount of carbon-14 gradually decreases as it decays to nitrogen-14 by the loss of an electron (so one neutron is changed to a proton) comparing the proportions of carbon-14 and carbon-12 in a sample of organic matter, and knowing the rate of conversion, a radiocarbon date can be determined: rate of radioactive decay: commonly expressed in half-lives. half life: time required for half the atoms to decay into daughter atoms. half life of carbon-14 is 5730 years y using radioactivity in dating: difficulties, importance.

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