Fossils in thin section

Calcareous algae in thin section

Red algae form magnesian-calcite crusts, nodules and branches with a rectangular or rounded cellular pattern; micritized fragments look dark brown and opaque. Green algae calcify within their tissues (for example the dasyclad Mizzia, a Permian marine green alga). Calcispheres are small hollow spheres, possibly algal.

**Mizzia, calcispheres, Archaeolithoporella, Tubiphytes and conodonts.** Michael C. Rygel via Wikimedia Commons, CC BY-SA 4.0. Source

**Maerl (red algal) sediment, Tromsø, Norway, thin section.** Wikimedia Commons (author and license on the file page). Source

Photos are hosted by their original sites and shown under their open licenses (CC BY, CC BY-SA, public domain or Open Government Licence). Click a photo for its source page.

All fossil groups Carbonate classification

Sources

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