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Updated: May 12, 2025
The Lower Silurian has been divided into, first, the Bala Group; secondly, the Llandeilo flags; and, thirdly, the Arenig or Lower Llandeilo formation. Orthis tricenaria, Conrad. Orthis vespertilio, Sowerby. Shropshire, N. and S. Wales. Two-thirds natural size.
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