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lithologic contact

1. n. [Geology]

The surface that separates rock bodies of different lithologies, or rock types. A contact can be conformable or unconformable depending upon the types of rock, their relative ages and their attitudes. A fault surface can also serve as a contact.

See: attitudehorizonlithologyrelative ageunconformity

Lithologic contact of dike and gneiss
Lithologic contact of dike and gneiss.

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