The Geology of the Hagshaw Hills Silurian Inlier, Lanarkshire

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Abstract
The 5000 ft. of pre-Downtonian or pre-Dittonian Silurian rocks of the Hagshaw Hills inlier of the Midland Valley of Scotland, have been redivided into nine formations, three more than recognised by Peach and Horne (1899). A poorly preserved shelly fauna from 900 ft. of marine turbidites shows lower beds of the inlier to be Upper Llandoverian-Lower Wenlockian, and not Salopian as previously reported. Comparison with other recently revised inliers of this region suggests an uppermost Valentian age for these beds. Current direction data show an anomalous southern derivation for the turbidites. Higher beds in the inlier are paralic or even terrestrial. Fossils from the Fish Bed Formation, previously thought to be the bryozoan Glauconomella disticha (Goldfuss), are described and referred to incertae sedis. A new locality of the Fish Bed is recorded. A large number of faults and igneous intrusions complicate the overturned asymmetrical anticline, and it is suggested that the bases of conglomerates have acted as detachment horizons during tectonism.