I live near Lake Clifton In Western Australia, home of these rare round thrombolites (see photo). I have always wondered what the grey "rocks" in between the thrombolites are. The one in the centre of the photo has the appearance of a fracture face on a piece of shale. I clambered down to get one of them only to find they were soft and almost jelly-like in consistency. They werejust about floating, bobbing with the water action, although some were submerged. Can someone identify them?
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