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EESA06 Lecture March 14.docx

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Environmental Science
Nick Eyles

EESA06 Lecture March 14 2009How are fossils formed shells buried and preserved unaltered 100 million years cavities filled with silica calcium carbonate irona process called mineralizationMethods Fossilization freezing drying asphalt amber carbonization permineralization most common peat bogs paraffin volcanic ashPermineralization die in or near water soft parts consumed by bacteria sedimentation fine grainedmore detail chemical makeup of rockcolour more seds pile onpressurerock mineral rich waterchanges to the shell uplifterosionAmmolitean organic gemstone ammonite fossilsiridescent aragonite with trace elements Fe Mn Al BaTrace fossils preserved tracks trails burrows borings ichnologystudy of trace fossils bioturbationprocess of disturbing sedimentFossils as clues to ancient environments palaeoecologystudy of ancient organisms and their environments clues from fossil types assemblages fossil morphology trace fossils Crinoid aka sea lily loose like a mop head on a tall stem made up of ringsplates found in the shallow seasFossils and stratigraphy how do we use fossils in stratigraphy to establish relative age of rock units correlate units rocks that represent the same time period in different locations what information do we need to do thisrelative age of rock unitsfossil species present in each unit
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