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“lithologic contacts”
The surface that separates rock bodies of different lithologies, or rock types: "A lithologic contact can be conformable (parallel strata that have undergone a similar geologic history) or unconformable depending upon the types of rock, their relative ages, and their attitudes. A fault surface can also serve as a lithologic contact."
This entry is located in the following units:
litho-, lith-, -lith, -lithic, -lite, -liths, -lites
(page 9)
tang-, tact-, tast-, ting-, -tig -tag, -teg-
(page 5)