Fossils in thin section

Molluscs: cephalopods in thin section

An axial section may show chambers decreasing in diameter. Without a siphuncle or septum it could be a gastropod. Geopetal sediment at the base and spar at the top show which way was up.

**Possible coiled cephalopod with geopetal fill.** Michael C. Rygel via Wikimedia Commons, CC BY-SA 4.0. Source

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More photomicrographs

Alex Strekeisen: Ammonites

All fossil groups Carbonate classification

Sources

Rygel & Quinton, Sedimentary Geology 9.7: Fossils in Thin Section