Silurian Fauna
The greater part of the known Silurian fauna of Britain comes from Wenlock rocks; J. Davidson and G. Maw obtained no fewer than 25,000 specimens of brachiopods from seven tons of the shale. Not only are there many different genera and species but individually certain forms are very numerous. The three principal zonal graptolites are, from above downwards: Monograptus testis, Cyrtograptus linnarssoni, and Cyrtogra murchisoni.
Read more about this topic: Wenlock Group
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