Printable Copy of the Field Study Guide (PDF)
Printable Copy of the Field Study Guide (PDF)
Printable Copy of the Field Study Guide (PDF)
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3) (a) How is chert nodule formation similar to how stalactites are formed?<br />
(b) Using <strong>the</strong> boulder with <strong>the</strong> nodules, explain <strong>the</strong> concept <strong>of</strong> differential<br />
wea<strong>the</strong>ring.<br />
Cephalopod Reading:<br />
Cephalopods are an ancient group that appeared some time in <strong>the</strong> late Cambrian<br />
period several million years before <strong>the</strong> first primitive fish began swimming in <strong>the</strong><br />
ocean. Scientists believe that <strong>the</strong> ancestors <strong>of</strong> modern cephalopods (Subclass<br />
Coleoidea: octopus, squid, and cuttlefish) diverged from <strong>the</strong> primitive externallyshelled<br />
Nautiloidea (Nautilus) very early - perhaps in <strong>the</strong> Ordovician, some 438<br />
million years ago. How long ago was this? To put this into perspective, this is<br />
before <strong>the</strong> first mammals appeared, before vertebrates invaded land and even<br />
before <strong>the</strong>re were fish in <strong>the</strong> ocean and upright plants on land! Thus, nautilus is<br />
very different from modern cephalopods in terms <strong>of</strong> morphology and life history.<br />
-http://www.<strong>the</strong>cephalopodpage.org/<br />
(a) Identify <strong>the</strong> fossil in <strong>the</strong> boulder.<br />
(b) What does <strong>the</strong> fossil tell you about <strong>the</strong> environment in which <strong>the</strong> rock was<br />
formed?<br />
(c) What does this fossil tell you about <strong>the</strong> type <strong>of</strong> rock in which it’s found?
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