The Fossiliferous Silurian Beds and Associated Igneous Rocks of the Clogher Head District (Co. Kerry)

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Abstract
I. Introduction The area dealt with in this paper is situated in County Kerry, at the westernmost extremity of the Dingle promontory. The exposures are met with over an area measuring about 4 miles from north to south by 3 miles from east to west; but, owing to the great amount of peat and alluvium, the exposures inland are somewhat scanty, and one depends mainly on the magnificent coast-section for geological information. The area is one of great interest to a geologist, from the splendid development in it of acid volcanic rocks, associated with beds mainly of Wenlock age. Except at Tortworth in Glouoestershire, and probably in counties Mayo and Galway, it is in the Clogher-Head district alone in the British Isles that contemporaneous volcanic rocks of Silurian age are definitely known to occur. While, too, the Tortworth volcanics are basic or intermediate in character and are mainly, if not entirely, of Llandovery age, in the Clogher-Head area the volcanic rocks are acid in character, and range throughout the Wenlock and up into the lower part of the Ludlow Series. Considering the number of interesting features shown, the area has been comparatively little described by geologists of recent years, but this is readily explicable owing to its remoteness and inaccessibility. The earliest reference to the geology of the district with which we are acquainted is contained in a paper by Thomas Weaver, 1 entitled ‘On the Geological Relations of the South of Ireland’. In this paper, which was read before the

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