Henry Warburton

“ In thus comparing the magnesian breccia of Bristol with the yellow limestone of the northern and midland counties, I have assumed that the red marl which lies above the coal measures is of the same order with that which lies at the bases of those escarpments, where strata of mountain limestone are broken off; and where instead of the lower beds rising from beneath the limestone we find horizontal strata of red marl filling the plains. ”

“ I have heard of the following additional cases in which a magnesian breccia is found in connection with red marl. Dr. Wollaston in the first instance and afterwards Mr. Greenough informed me that a similar rock was found near to Cowbridge in South Wales, a specimen of which was presented by the latter to the Society. Mr. Aikin also has noticed a breccia of the same description at Caerdeston and Loton in Shropshire. ”

“ This breccia consisted of rolled fragments of milk white quartz, and of angular fragments of limestone and sandstone such as are found in the neighbouring inclined strata cemented together by yellow magnesian carbonate of lime; the cement being in great excess. ”