This article is a study of Triassic diabases in a belt extending from Goose Creek, Va., to Pennington, N. J. It gives an interpretation of the "diabase magma" as a mixed solution of "basaltic magma" and assimilated "acid magma." Rock types derived from the mixed magma are described. Solidification of the "diabase magma" is interpreted from a series of observed phases. Changes in chemical composition of the magma as solidification progresses and probable composition of residual solutions are noted.Applications of this interpretation are made to theories of origin of the iron ores found along limestone contacts in part of the belt.

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