Description
Item Description:Title from title screen (viewed October 2, 2014).
"Chemical, semiquantitative spectrographic, and modal analyses and potassium-argon and uranium-lead age determinations on granitic and volcanic rocks supplement Geologic Quadrangle Map (GQ-1271)."
Physical Description:1 online resource (iii, D20 pages) : illustrations, maps.
Bibliography:Includes bibliographical references (page D3).