Mafic igneous intrusive (diabase or diorite) intruding a fine-grained limestone of the Naco Group just north of Winkelman, Arizona. Dike is roughly 4-6 meters thick.
Photographer: Mike Conway
Photo Date: January 2016
Photo Location Accuracy: Approximately Located
Photo Tags: Permian, Naco Group, Limestone, diabase dike 
