Cross-section through a microconchid, a minute encrusting organism resembling a snail. Numbers indicate successive sections through the animal's coiled shell. At the bottom right of the image the uppermost surface of a bryozoan is visible. This is the substrate on which the microconchid grew. Note prominent curved ridges visible on the top surface of section 4. Mississippian, North Alabama, thin-section photomicrograph, image 1 mm wide.
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