shales with Graptolithina from Silurian

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Photo credit: © blickwinkel/R. Koenig / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: eon, era, evolution, format, fossil, fossiliferous, fossilisation, fossilisations, fossilised, fossilized, fossils, geological, geology, graptolithina, hint, hints, horizontal, palaeontology, palaeozoic, paleozoic, phanerozoic, shale, shales, silurian, stone, stones, surface, surfaces, trace, traces, track, tracks