The Eastern end of the Newry Igneous Complex

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Abstract
I. Introduction The Newry Igneous Complex, generally known as the Newry granite, extends from Slieve Croob in County Down, where it attains its greatest height, south-westward past Newry into County Armagh. A general account of the “granite” was given by J. E. Richey and H. H. Thomas in their recent description of the Tertiary Ring Complex of Slieve Gullion. As pointed out by Richey, it has an elongate outcrop with dimensions of roughly 26 by 6 miles, extending in a direction E. 35° N. to W. 35° S. parallel to the prevalent strike of the Silurian rocks, and can be assigned to the Old Red Sandstone period of activity. The eastern end of the mass is now definitely dated by the fact that on Seeconnell it is cut by hornblende-lamprophyres (spessartites), similar to the uncrushed hornblendic types in the Ards Peninsula and there found to belong to the Caledonian period of activity, but to be post-Caledonian folding in age. This evidence, in conjunction with the absence of signs of crushing in the eastern end of the mass, fixes the age within narrow limits. The present paper forms part of a detailed investigation of the area, and deals with the eastern end of the complex as far westward as Slievenaboley and southward to Lough Island Reavy, the region described being about 21 square miles. This small area is so crowded with interest in regard both to variety of rock-types and evidence of hybridization and ultrametamorphism, that it is considered to merit

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