Igneous origin of the Orbicular Rocks of the Sandia Mountains, New Mexico Enz, R. D. ; Kudo, A. M. ; Brookins, D. G. Abstract Publication: Geological Society of America Bulletin Pub Date: February 1979 DOI: 10.1130/GSAB-P2-90-349 Bibcode: 1979GSAB...90..349E