Silurian (late Llandovery-Ludlow) Atrypid Brachiopods from Gotland, Sweden, and the Welsh Borderlands, Great Britain
This report details the morphology, evolution, and paleoecology of the rich & well-preserved Silurian atrypoid brachiopods found on the island of Gotland in the Baltic Basin and in the Anglo-Welsh Basin, United Kingdom. It includes information about the field & laboratory methods used in investigating these fossil species, historical background on research into atrypid species since the mid-1700s, an outline of the stratigraphy of the study areas & the distribution of atrypid species within the various strata, and clarification of the internal structure of over 45 species. The largest section of the report is devoted to a systematic paleontology of the species studied, including documentation of several new species. Numerous detailed illustrations & plates accompany the text.
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Plectatrypa Gutnia capidula Copper 1996b
absent abundant adult Alexander apical appears assigned Atrypa Atrypa reticularis atrypid Atrypina Atrypoidea averaging base Bassett beak brachiopods Britain cavities collections commissure common Copper crura Davidson deeper deltidial plates dental depth developed Devonian directed distinct dorsal Dudley early Edited facies fauna fold foramen Formation frills genera genus Geological Glassia Gotland growth lamellae Havlíček Hemse Hemse beds hinge horizon internal jugal processes Klinteberg lacking late lateral Lissatrypa Llandovery lower Ludlow material middle Mulde occur Oglupes outcrop peak pedicle Plectatrypa probably range rare reefs relatively Remarks Rhuddanian ribs rounded Septatrypa serial sections settings shales shallow shell short side Silurian similar slightly Slite beds smooth socket species specimens spiralia Spirigerina stages strata suggests teeth thick thin type locality unit upper valve ventral Visby Visby beds weakly Wenlock Edge Wenlock Limestone wide width Zone