Bryozoan-coral boundstones in Miodiocris breviscula zone.
(with crinoids)
Corals: Cyathaxonia, Clisiophyllum, Akiyoshiphyllum, Carcinophyllum, Hiroshimaphyllum (dominant), Amygdalophylloides.
22 bryozoan species in whole Carboniferous succession.
Partial abstract of ref. 2181:
Sedimentary facies in the Carboniferous part of the Omi Limestone are generally highly diverse, but their diversity varies in each age. The Upper Carboniferous part consists of highly diversified facies including fore reef, reef front, reef crest, sand shoal, and lagoon facies, while a simple facies assemblage, composed only of fore reef, reef front, and sand shoal facies, occurs in the Lower Carboniferous.

 The first phase, comprising the coral-bryozoan-crinoid community, occurs in the Endothyra spp. Zone to the Eostaffella kanmerai Zone (Visean to Serpukhovian). 