The Breconian stage of the Anglo-Welsh Old Red Sandstone is defined. The Breconian follows the Dittonian and precedes the Farlovian. In Breconshire, the Breconian comprises the Senni Beds and the overlying Brownstones. The Senni Beds have yielded a fauna and flora of Siegenian-Emsian age; the Brownstones are apparently unfossiliferous.
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William N Croft (1953) studied this question.
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