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Showing results for tags 'heteractinid?'.
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From the Great Limestone, Pendleian (Upper Mississippian) of County Durham, UK. One for @Spongy Joe and any other sponge experts out there. There appear to be no sponges (apart from Chaetetes) recorded from this well researched limestone but I've collected over thirty over the past few years. There are several different types, generally fossilised as broken fragments though these can be quite large (several inches across). This one is a curved sheet, like part of a vase or dish, about 10 - 15mm thick. The outer (convex) layer contains a good proportion of spicules showing five (and a few six) rays so could it be a heteractinid of some sort? The preservation is mostly calcite, perhaps original. Scale bar is 1cm long. Vertical section, showing disposition of tangential sections below. (specimen no. Sp. 13) Tangential section, cutting through outer surface on right and bottom (the orange layer, with smaller spicules than the internal ones). Closeups of tangential sections. Several five rayed spicules are visible along the edges (i.e. in the outer layer).
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