a. Pertaining to rocks or strata that are normally above those of earlier formations of the same subdivision of rocks. The adjective is applied to the name of a chronostratigraphic unit (system, series, stage) to indicate position in the geologic column and corresponds to late as applied to the name of the equivalent geologic-time unit; e.g., rocks of the Upper Jurassic System were formed during the Late Jurassic Period. The initial letter of the term is capitalized to indicate a formal subdivision (e.g., "Upper Devonian") and is lowercased to indicate an informal subdivision (e.g., "upper Miocene"). The informal term may be used where there is no formal subdivision of a system or series (counterpart of lower). CF: lower; middle. AGI
b. See: up hole
Source:
Dictionary of Mining, Mineral, and Related Terms












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