Biology 1001A Chapter Notes - Chapter 14: Fossil, Lambeosaurinae, Paleozoic
27 Dec 2015
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Many fossils found in sedimentary rock: sediments found in any one place form distinctive strata (layers) Strata usually differ in colour, mineral composition, particle size, thickness. If not disturbed, strata are arranged in order in which they are formed. Strata sometimes uplifted, warped, inverted by geologic processes. 19th century geologists deduced that fossils discovered in particular sedimentary stratum, no matter where found, represent organisms that lived/died at roughly the same time in the past. Each stratum formed at specific time, sequence of fossils (oldest to newest) strata reveals relative ages: geologists used sequence of strata/their distinctive fossil assemblages to establish geologic time scale o. Fossil record is incomplete because: some remains are frozen/mummified, petrified forests are trees fossilized by minerals, few organisms fossilize completely, some more likely to fossilize than others, natural processes destroy many fossils. 2 tomography: the use of thin sections cut from a fossil to reconstruct the organism"s appearance: ex.
