| Fossil |
What they looked like |
Where they lived |
| BRACHIOPODS |
Two shells or valves, one more convex than the other or one concave.
Valves unequal in size but symmetrical.
 |
Marine with a 'foot' that anchored the creature to the sea floor or rock. |
| BIVALVES |
Two asymmetric but equally shaped valves or shells with one the mirror
image of the other. |
Marine and fresh water. Able to anchor itself, be free moving or burrow into sands. |
GONIATITES
|
Spirally coiled shell divided into chambers with the animal living in the last constructed one.
 |
Marine and free-swimming. |
CORALS
|
Groups of organisms that take calcium carbonate from seawater and produce an external skeleton.
May be solitary (simple) or compound (colonial). |
Grow attached to the sea floor and for some species, build large colonies, or reefs. Warm, mud-free seawater not deeper than the depth that the sun can penetrate. |
| CRINOID |
Five-fold symmetry with long-jointed calcareous stem topped by the animal’s ‘house’ made of plates of calcite from which 5 branching ‘arms’ collect food.
 |
Marine and attached to sea floor. |
Specimens photographed with kind permission
of Buxton Museums & Art Galleries.
