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PAST LIFE
Lesson 4 - Page 3

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The only vertebrate group represented in this lab is the fish group. Vertebrates are organisms with a backbone. Fish have a higher likelihood of becoming a fossil, because they can be preserved in fine grained sediments after they die. Many land vertebrates do not have conditions right for preservation. The carbonized impression of the fish shows details of the entire fish.

The shark teeth only represent a small part of the shark, yet you can estimate the size of the shark. Big teeth come from big sharks. The abundance of shark teeth is caused by a shark discarding its teeth once it bites into something.


Shark tooth


Fossil fish

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