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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 one of the most common sedimentary rocks. It is composed of silt or clay that has been compacted or squeezed together to form a solid rock. Shale is usually found in thin layers. The silt or clay that composes shale is made of very small pieces of weathered rock. The pieces are from 1/16 to 1/256 of a millimeter in diameter.