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The occurrence of the Ordovician brachiopod Heterorthis alternata (J. de C. Sowerby) in the topmost Onnian of the type Caradoc area
Published online by Cambridge University Press: 01 May 2009
Summary
The orthidine brachiopod Heterorthis alternata (J. de C. Sowerby 1839) is here recorded from the River Onny Cliff Section at an horizon high in the Onnia superba Zone of the Onnian Stage. Previously it had only been recorded from rocks of Upper Longvillian, Marshbrookian and Actonian age of South Salop and of Upper Caradoc age of Morocco.
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