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Northern Ireland Geology-Shale and Greywaches. Shale is a fine grained sedimentary rock which splits easily. It can contain fossils such as graptolites which are characteristic of the Silurian and Ordovician Periods. Some excellent shale outcrops with numerous graptolites can be found along the coast around Donaghadee.
Shale is a sedimentary rock composed of very fine clay particles. Clay forms from the decomposition of the mineral feldspar. Other minerals present in shale are quartz, mica, pyrite, and organic matter. Shale forms in very deep ocean water, lagoons, lakes and swamps where the water is still enough to allow the extremely fine clay and silt particles to settle to the floor. Geologists estimate that shale represents almost Â¾ of the sedimentary rock on the Earthâs crust. Geologists are specific about the definition of the rock called âshale.â Shale is composed of clay particles that are less than 0.004 mm in size. Relation to Mining Typically, common clays and shales are dug from open pits, and these pits must be near the processing plants to minimize production costs.