I. INTRODUCTION. T he Drummuck Group as defined in this paper falls entirely within the one-inch Geological Map, Scotland, Sheet 14. It forms part of the succession in the Craighead-Glenshalloch inlier. This elongate, anticlinal inlier—which comprises all the Ordovician and Silurian beds north of the Girvan valley—consists of three main blocks:—(1) Craighead Hill; (2) Drummuck and Quarrel Hill; and (3) a less well-defined north-eastern block, entirely (Lapworth, 1882, Pl. XXIV) or partly (Geological one-inch Map, Scotland, Sheet 14) divided by faulting from the Drummuck and Quarrel Hill block. II. TABLE OF STRATA IN THE CRAIGHEAD-GLENSHALLOCH INLIER. The following table embodies the findings of previous authors (Lapworth 1882, Peach and Horne 1899, Jones 1928, etc.) and also additions proposed in the present revisory paper:— III. NOTES ON PREVIOUS RESEARCH. An early contribution to the reading of this succession was that by Murchison who distinguished an ascending series consisting of (1) lavas, (2) Craighead Limestone, (3) sandstone and conglomerate of Mulloch Hill, and (4) Drummuck shales (1851, pp. 143-146). Hugh Miller, while deferring to Murchison, was not quite sure that the Drummuck beds succeeded those of Mulloch Hill (1858, Everyman Edition, p. 299). The age and stratigraphical order of the beds were not settled until Archibald Geikie wrote a substantially correct summary interpretation (1869, pp. 8-10). It remained, however, for Lapworth, as part of his paper “The Girvan Succession,” to publish, in full detail, what is still the definitive account of the inlier (1882, pp. 614-621). In this paper, which is illustrated with This 250-word extract was created in the absence of an abstract
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Archie Lamont (1935) studied this question.