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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 rock composed mainly of clay-size mineral grains. These tiny grains are usually clay minerals such as illite, kaolinite and smectite. Shale usually contain other clay-size mineral particles such as quartz, chert and feldspar.hale is a rock composed mainly of clay-size mineral grains. These tiny grains are usually clay minerals such as illite, kaolinite and smectite. Shale usually contain other clay-size mineral particles such as quartz, chert and feldspar.