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Updated: May 6, 2025
To this Upper Devonian belong a series of limestones and slates well developed at Petherwyn, in Cornwall, where they have yielded 75 species of fossils. Heliolites porosa, Goldf. sp. Portion of the same magnified. Favosites cervicornis, Blainv. S. Devon, from a polished specimen. a. Cyathophyllum caespitosum, Goldf.; Plymouth and Ilfracombe. b. A terminal star. c.
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