The 188th meeting of the Geological Society of Washington

“was devoted to a consideration of the ‘Methods of Igneous Intrusion.’ The discussion was opened by Mr. Whitman Cross, who directed it to the methods by which the large igneous masses, such as laccoliths, stocks and batholiths, have come to the places where they are now visible. The three main agencies called upon in current literature to account for these masses are: (1) Mechanical displacement of the invaded rocks, (2) fusion and assimilation of the rock by the magma, (3) ‘magmatic stoping.’” (Wright, 1907).

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This meeting was held 100...

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