The calcareous or sandy tube of some sedentary marine worms, such as fan worms.
- Ammonoids, gastropods, and serpulid worm tubes are also recorded.
- A few mineralized animal fossils, including sponge spicules and probable worm tubes, are known from the Vendian period immediately preceding the Cambrian.
- Thin sections were made of the carbonates containing worm tubes.
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