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black shale

Galleries in black shales: a gallery

A gallery of trace fossils from the Silurian of Sardinia The word pun of the title refers to the fossil tunnels preserved in the Genna Muxerru Formation. They have been produced 440 million years ago by unknown organisms within a muddy seafloor. To know more,…

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Bioturbated black shales

Black shales are dark, fine-grained rocks that conjure up with images of lifeless seafloors. In fact, they usually originate as muds deposited in low-oxygen seafloors. As such, they are expected to be devoid of life... but there is a burrow in this 440-million-years-old black shale…

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