Abstract

A limited number of terms of petrology and mineral deposits, both descriptive and genetic in nature, are reviewed and discussed. The writer believes that there is still too much careless and subjective use of terms. This in part arises from the currently sharp separation of practice from theory. The terms stock and batholith are too often used subjectively. Terms defining changes in rocks seem to need clearer definition. The term contact metamorphism is particularly troublesome. In the genetic category hydrothermal and pneumatolytic appear to need clarification.

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