Abstract
THE Wenlock Limestone outcrops intermittently within the inlier of Silurian rocks situated between Usk and Pontypool, and the ‘Cornstones’1 as discontinuous bands within the Old Red Sandstone of Monmouth. Samples of both limestones were crushed, dispersed, and particles with a diameter greater than 0.2 mm. removed by wet sieving, and those with a diameter less than 0.02 mm. by decantation. The residue corresponding to fine sand contains the bulk of the heavy minerals which were separated in bromoform, identified, and their relative proportions determined by microscopic counts which have been combined in Table 1.
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References
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CRAMPTON, C. Heavy Minerals in Certain Old Red Sandstone and Silurian Limestones of Monmouth. Nature 183, 485 (1959). https://doi.org/10.1038/183485a0
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DOI: https://doi.org/10.1038/183485a0
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