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Geology - Diabase Dikes

Published by Wake County | Wake County | Metadata Last Checked: February 21, 2026 | Last Modified: 2025-01-07T18:34:42.358Z
Polylines representing the dikes, folds and cross sections for the Caldwell 7.5-minute quadrangle, North Carolina Diabase dike - inferred - Diabase: Black to greenish-black, fine- to medium-grained, dense, consists primarily of plagioclase, augite, and may contain olivine. Occurs as dikes up to 100 ft wide. Diabase typically occurs as spheriodally weathered boulders with a grayish-brown weathering rind. Red station location indicates outcrop or boulders of diabase.

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