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courtney
flash cards
Question | Answer |
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can be any of the six types of fossils. it tells you the geologic period of the rock layer in which it is found. | index fossil film |
the remains have been replaced by minerals | petrified |
when a mold gets filled in with solid material | cast |
a hollow spot in a rock left in a sedimentary layer by an organism | mold |
a missing layer of rock, representing missing time in a geologic sequence | an unconformity |
any evidence of former life | fossils |
sedimentary rock layers start off flay lying | original horizontalty |
the fragments that make up a rock are older than the rock itself | included |
no portion of the organism, just evidence that it lived there. | trace fossil |
an unchanged shell, tooth, etc.. | Original remains |
younger layers sit on top of older layers | the law of |
cutting relationships formations cut across older | cross |
A. easily recognized B. global Distribution C. lived for a brief period of time Three properties of an? | index fossil |
events are in the sequence that they occured | relative dating |
how many years ago is determined | absolute dating |