Trombolites, incrusted Crescentiella morronensis, and Terebella lapilloides, subordinate corals and
sponges, which are interpreted as deep-water
(mainly microbial) bioherms and a new type of forereef apron deposit discovered in limestones
of the Baidar plateau. Such aprons include
gravitation flow sediments. intraclast rudstones
and floatstones with clasts of various reef-builders, as well as sorted grainstones, rudstones, and microbreccias that bear structural signs of unidirectional current and gravitation flow in some places.