FOSSIL GRAPTOLITES of the Silurian era, 443-416 million BC, monograptus sedgwicki, an early chordate, from Gera, Hohenleuben/Thur, Germany, they are 2-3mm wide finely segmented lines, 20-30mm long, 3 of them and some bits, on 63x75mm gray shale slab, several specimens on slate slab

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Graptolites were a group of organisms that formed branched colonies, like corals, during the Carboniferous time when the coal was being formed.

I heard a paleontologist on the radio making a statement that fossils in general are extremely common and can be found all over the place.