Orthoceras |
The creature lived in this bowl and looked a little like a squid. It supposedly had eyes and short tentacles.
The depression in the bottom of the bowl was called a siptal neck according to Wikipedia. It was a tube which connected the current living space to previous ones. Much like a snail, as it grows, it moves on and builds a new larger living space. Wikipedia has an artists conception of how this creature might have appeared.
Orthoceras |
This fossil is from about 400 million years ago. It has the bowl on one end and a rounded rear end.
Orthoceras |
The creature was an invertebrate, having no skeleton and having an exoskeleton in the form of a shell. When the creature reached the end of its life the shell fossilized over time and became rock.
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