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Showing results for tags 'mat'.
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I'd like to put this up for opinions... A thin limy layer interrupting the usual black shales from my usual Upper Cretaceous site (there are bits of the shale still stuck on top here and there). To me it screams of something like a bacterial mat, but I don't know. I can't imagine any non-biological process of formation, but maybe there is one that I haven't considered? The last pic shows an edge to give an idea of the thin lighter-colored layer. These pieces were all from one contiguous surface a couple feet square or so on a chunk of shale - the only one I have found up there so far with this particular pattern, but in other spots at this site and other sites, I have found similar calcareous(?) 'blobs' of all sizes that seem to have something to do with life, sometimes associated with obvious fossils such as Ino- and Sphenoceramus shells (no fossils were evident on this surface, though).
