Atlantic flow. Includes Atlantic amygdaloid and underlying trap. Age is Precambrian (Keweenawan).
Named from occurrence in Atlantic Mine, Houghton Co., northern MI.
Source: US geologic names lexicon (USGS Bull. 896, p. 164); GNC MI Keweenawan Series Corr. Chart, June 1929.
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
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