early Llanvirn
35 m thick, > 150 m wide stromatactis mud mound.
< 10 km across.
15-30 % are calcareous algae and invertebrates.
Only conspicuopus megafossils are lithistid sponges and sclerosponges (Lapidipanis). Girvanella oncolites and coarse pelmatozoan debris.
Fragmented foreland basin platform. Mounds nucleated on structural highs.