Recent evidence for the age of the Hagshaw Hills Silurian Inlier, Lanarkshire

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Abstract
Synopsis: A graptolite fauna discovered in the basal beds of the Hagshaw Hills Inlier suggests an Upper Valentian age. Fragments of stromatoporoid and bryozoan colonies found in the hitherto unfossiliferous Parishholm Conglomerate indicate derivation from a source rock of Wenlock age. Since the Parishholm Conglomerate is thus younger than some part of the Wenlock it supports the recent suggestion that this conglomerate is paraconformable. The new evidence implies that the upper ‘fish’ beds of the Midland Valley inliers are post-Wenlock and therefore Ludlow in age as maintained by Westoll, but that a greater time interval separates upper from lower ‘fish’ beds than was formerly allowed. An overlooked publication by Peach in 1902 records a shelly fauna from the base of the Lesmahagow succession which permits closer correlation between the Hagshaw Hills and Lesmahagow inliers.

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