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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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HEMICHORDATE HERITAGE: GRAPTOLITES

From the dark shales of the Piranha Formation in Bolivia comes a striking fossil — Isograptus cf. maximus, a graptolite from the Middle Ordovician (Dapingian Stage), some 470 million years ago. This specimen, preserved in exquisite detail, is a window into the complex colonial life forms that once drifted through the ancient oceans of Gondwana.Graptolites (Graptolita) were colonial marine

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