The Geologic Map of North America is the first (but last-issued!) of six continent-scale maps in the DNAG series. It was compiled by John C. Reed, Jr., John O. Wheeler, and Brian E. Tucholke, and is printed on three sheets; the map itself is on two sheets, one to the north of the other, with generous overlap along a trim line for mounting. Joined, the map is nearly square, measuring 1.75 by 1.70 m. The title of the map is perhaps a bit misleading because the geology of the surrounding oceans is also depicted. In places, this complicates decoding and...

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