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Topic 8: Fossils
Trilobite |
Dates to Remember April 30: Video - Fossils by Bill Nye. Topic 4 review due. Look at some fossils. May 1: Make A Lasting Impression Activity Page 421. Bring in small objects and margarine pots. May 2: Activity - paleogeography hand out. Topic 7 review page 422 .
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New words: Fossil: the remains or trace of a once living organism. Petrified: replacement of calcium carbonate (soluble in water) with silica (quartz) making a bone or plant into a hard rock-like substance. Carbonaceous film: the outline of an organism outlined by a thin covering of carbon residue.
Trace fossils: evidence of animal activity,e.g. footprints, worm burrows, snail trails.
Unknown tracks - any ideas?
Unknown animal footprints Mould: the cavity left by the dissolving of the original organism. Cast: the shape of the organism that is made by the filling in of a mold with other sediments.
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Resources: Text Book pages 418-422
Coprolite (dinosaur poo!)
Stromatolite - ancient bacterial build up. layers were produced as calcium carbonate precipitated over the growing mat of bacterial filaments, 3.8 to 2.5 billion years ago. |
© Diane Nowlan, April 2002
All contents copyright © 2002, Diane Nowlan
Revised:January, 2002
Author: Diane Nowlan
jdnowlan@cbe.ab.ca