The Bishop's Frome Limestone (or Bishops Frome Limestone) is a rock unit within the Raglan Mudstone Formation of the Old Red Sandstone occurring in the border region between England and South Wales.
It is perhaps the most significant of all of the calcretes which occur within the uppermost Silurian and lower Devonian sequence of rocks which constitute the Old Red Sandstone of the Anglo-Welsh Basin.
The fossil remains were subsequently shown to have been wrongly identified and belong in fact to Traquairaspis symondsi.
The British Geological Survey has more recently redesignated it as the Chapel Point Limestone member, after a locality in Pembrokeshire where it also occurs.
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