Fossil Evidence Form 2011 - EAS 1700 Worksheet YOUR NAME...

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EAS 1700 Worksheet Y OUR N AME ……………………………………… F OSSIL E VIDENCE OF L IFE AND I TS E NVIRONMENT E XERCISE 1: T HE F OSSIL R ECORD AS A C HRONICLE (Six @ 5 pts = 30 pts) Roughly 10 3 feet thick and representing about 10 6 years, the Ithaca Formation consists of alternating layers of siltstone (each typically comprised of sediment laid down in a matter of few minutes out of a turbidity current) and shale (formerly mud, representing deposition during intervening periods). A. Going by the few-cm-thick siltstone layers in the drill cores, roughly how much time elapsed, on average, between the deposition of turbidite layers? B. What resemblance does one see between the siltstones and the layer of silt left behind by a storm such as Hurricane Katrina, and what can one conclude about the Ithaca Formation’s manner of deposition? C. Most body fossils …. survive no more than few years when exposed on the sea floor. Roughly what fraction of the time elapsed between deposition of any two Ithaca
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Fossil Evidence Form 2011 - EAS 1700 Worksheet YOUR NAME...

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