Figure 2.--Topographic and geologic map of sampled stratigraphic section of Minturn and lowermost Sangre de Cristo Formations at Marble Mountain (geology from Lindsey, Johnson, and others, 1986). Red dot, sample location and number; green line, measured section; Qrf, Quaternary rockfall deposits; Qpt, Pinedale till; PlPsc, Permian and Pennsylvanian Sangre de Cristo Formation, Crestone Conglomerate Member; PlPsu, Sangre de Cristo Formation, undivided; lPm, Pennsylvanian Minturn Formation; cls, crinoidal limestone; bls, biohermal limestone; Xm, Proterozoic X mafic igneous rock; Xqm, quartz monzonite; and Xgn, gneiss.