XII. Memoir on the Geological Relations of the East of Ireland.

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Abstract
Contents. INTRODUCTION, § 1 to § 4. FORM OF SURFACE. General view of the Limestone Plain; Mountain Groups; Eastern, Southern, Western, Central, and Northern Mountains and Hilly Tracts; Elevation of these respectively, § 5 to § 10. GEOLOGICAL RELATION. General distribution of the subject, § 11. I. Primary Tracts. Eastern mountain chain; general structure, § 12 to § 14. 1. GRANITE. Bounded by other rocks; its extent; structure; minerals found in it; contemporaneous veins; stratified, § 15 to § 20. 2. MICA SLATE. Eastern Division. —Its extent, structure, position; contact with other rocks; interstratified with granite, quartz, talc slate, and trap rocks; traversed by contemporaneous veins; minerals contained in it, § 21 to § 38. Western Division. —Extent; interrupted; bounded by other rocks; in caps; interstratified with granite, quartz, trap, and porphyry; contains discontinuous beds and veins of granite and quartz; minerals imbedded in it, § 39 to § 50. 3. CLAY SLATE. Western Division. —Extent; position; interstratified with trap and porphyry; with clay slate conglomerate, greywacke, and greywacke slate, and with granite, § 51 to 55. Eastern Division. —Extent; position; surrounds isolated portions of the fundamental granite; interstratified with granite, with quartz rock, greywacke, greywacke slate, trap, and porphyry; note on basalt; mutual relations of clay slate and quartz rock with hornstone and flinty slate, and with greywacke and greywacke slate; inflections of strata; general view of the stratified structure; distribution of metals through rocks; application of the term transition, § 56 to § 88. METTALLIFEROUS RELATIONS OF THE

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