Fossils in thin section

Molluscs: gastropods in thin section

Longitudinal cuts show squat spirals; transverse cuts show spirals passing into and out of the plane. A small gastropod can sit inside the outer whorl of a larger one. Shell mineralogy as for other molluscs (mostly aragonite, often replaced by spar).

**Gastropods: longitudinal and transverse cuts.** Michael C. Rygel via Wikimedia Commons, CC BY-SA 4.0. Source

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More photomicrographs

Alex Strekeisen: Gastropods

All fossil groups Carbonate classification

Sources

SEPM Strata: Skeletal Grains · Rygel & Quinton, Sedimentary Geology 9.7: Fossils in Thin Section