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1. ⁴⁰Ar/³⁹Ar ages of some Challis Volcanic Group rocks and the initiation of Tertiary sedimentary basins in southwestern Montana

Author/Creator:

M'Gonigle, John W.

Publication/Creation:

Denver, CO : For sale by the U.S. Geological Survey, Information Services

Format:

Book

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2. The Río Abajo, Pitahaya, and Daguao Formations in eastern Puerto Rico : a description of three largely volcaniclastic units, which are assigned an early Cretaceous age

Author/Creator:

M'Gonigle, John W.

Publication/Creation:

Washington : U.S. Govt. Print. Off, 1977

Format:

Book

Is Part Of:

U.S. Geological Survey bulletin, no. 1434-1439.

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