EESA06H3 Lecture : EESA06 Notes Mar 14.docx

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Shells buried and preserved unaltered (<100 million years) Cavities filled with silica, calcium carbonate, iron a process called mineralization. Sedimentation (fine grained = more detail; chemical makeup of rock = colour) More sed s pile on = pressure = rock. Mineral rich water = changes to the shell. Iridescent aragonite with trace elements (fe, mn, al, ba) Palaeoecology study of ancient organisms and their environments. Clues from: fossil types, assemblages, fossil morphology, trace fossils. Sea lily , loose like a mop head on a tall stem made up of rings & plates, found in the shallow seas. To establish relative age of rock units, correlate units (rocks that represent the same time period in different locations) Establish time of first and last appearance of each species geologic range. Note: certain species only live in certain time periods. The fossils of short-lived species are more useful than fossils that lived over long periods of time.

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