Epibiont taxa are extremely rare in the Bear Gulch Limestone Member, other than those attached to coiled cephalopods, suggesting either that there were limited benthic platforms which encrusters could colonise or that bottom water conditions were inimical to benthos (Thomas, N. 2004).

https://figshare.le.ac.uk/articles/thesis/The_taphonomy_of_a_carboniferous_lagerst_tte_the_invertebrates_of_the_Bear_Gulch_Limestone_Member/10164188?file=18317852

'Larger coiled cephalopods (>70mm) from the Bear Gulch Limestone Member have relief, but lack sufficient morphological detail, such as septa, suture patterns or position of the siphuncle, to identify them further. They have undergone varying degrees of aragonite dissolution and subsequent compaction.'