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Sediment: Oer-IJ clay
Stromatopores are colonies of marine organisms with calcareous skeletons. In the Silurian and Devonian period stromatopores were important reef builders. Stromatopores forms thin lime layers in a characteristic pattern. At the end of the Devonian period, they became extinct. The taxonomy of this group is unclear, but they are typically assigned to the sponges (Phylum Porifera). Sometimes flow openings can be seen, similar to the sponges. In stromatopores these flow openings are called astorhidzen.
Example of a Stromatopore with astorhidzen
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