Stage 4

Interesting example of a large archaeocyathan reef lacking typical kalyptrate structures.

Another specific feature of the Seer Reef is its principal composition of solitary archaeocyaths and synsedimentory fibrous calcite cement, enveloping their cups, with subdued calcimicrobal
patches. Mud fillings are restricted to the reef top and some areas of lava breccia development. Such composition indicates higher-energy conditions.