Fig. 1: Stacked visualizations of the Colorado Plateau showing oblique views of major topographic, geological, and geophysical features discussed in text.
From: Basin record of a Miocene lithosphere drip beneath the Colorado Plateau
a Modern topography and the distribution of faults (yellow lines)71 relative to the locations of the Hopi Buttes Volcanic Field, the Bidahochi Basin, and the Escalante anomaly (dashed—Vp anomaly at 95 km; solid—125 km; dotted—195 km), interpreted to be an active lithosphere drip beneath the Colorado Plateau7. Anomaly contour at 125 km (solid white line) is reproduced in subfigures (c) and (d) for reference. b Structural contour map of the Mesozoic-Paleozoic boundary showing major structural uplifts and basins of the Colorado Plateau38,72; c GRACE free-air gravity anomaly projected on base of modern topography (GeoMapApp), with −2 to −3 m contours of the filtered lithospheric geoid (degree/order filter of 14/17-355/360)4 and d depth slice at 125 km of Vp anomaly, with white dotted and dashed lines marking the interpreted transition between fast and slow anomalies at depths of 125 and 90 km, respectively73. Shaded area in top inset shows bounds of displayed visualizations. In a, solid light blue outline (1) indicates the (disputed) maximum extent of the Hopi Paleolake assuming no change in topography over time, while the dashed outline (2) indicates the exposed extent of the lower to middle members of the Bidahochi Formation, with the interpolated contours of the basal unconformity shown directly above. Note that this outline does not necessarily define the maximum extent of the basin or a lakeshore highstand of the paleolake. State boundaries and the cross-section line (A-A′-A″) of Fig. 4 are projected on all images. v.e.—vertical exaggeration; Kaip.—Kaiporowitz Basin; H.Mt.—Henry Mt. Basin. CRPR—Crooked Ridge Paleoriver. Additional map views of this figure are available as Supplementary Fig. 1.
