A horse, in geology, is any block of rock completely separated from the surrounding rock either by mineral veins or fault planes. In mining, a horse is a block of country rock entirely encased within a mineral lode. In structural geology the term was first used to describe the thrust-bounded imbricates found within a thrust duplex.Dennis, J.G. 1967. International tectonic dictionary. AAPG Memoir 7, 196pp. In later literature it has become a general term for any block entirely bounded by faults, whether the overall deformation type is contractional, extensional or strike-slip in nature.Root, K.G. 1990. Extensional duplex in the Purcell Mountains of southeastern British Columbia. Geology, 18, 419-421
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