I've found a few small specimens of the delicate bryozoan Sulcoretipora incisurata at Deep Springs Rd. They are a flat genera of bryozoan that occasionally bifurcates. If these were present in the Windom shale then there was likely not very much turbulence in the water from waves or currents. This lends more evidence to the theory that sometimes the environment preserved in the Windom shale at this site was sometimes quiet enough for more delicate sessile animals thrive.
I've posted some samples from the similarly aged Mahantango formation before in this post.
A similar species, Sulcoretipora deissi, is found in the Silica shale.
These specimens were found at a borrow pit on Deep Springs Road in Madison County, NY which exposes the Windom shale member of
the Moscow formation (middle Devonian in age, Givetian stage.)