noun
1. : a columnar diagram that shows the rock formations of a locality or region and that is arranged to indicate their relations to the subdivisions of geologic time
2. : the sequence of rock formations in a geologic column
noun
1. : a columnar diagram that shows the rock formations of a locality or region and that is arranged to indicate their relations to the subdivisions of geologic time
2. : the sequence of rock formations in a geologic column
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012