Diagrammatic Representation of the Geology in the Dry Valleys, McMurdo Sound, Antarctica. — FIG. 1: Deposition of Skelton Group sediments in a geosyncline of Precambrian to Cambrian age, with subsequent igneous intrusion. — FIG. 2: Ordovician Orogeny — folding and metamorphism of the sediments with contemporaneous intrusion of a syntectonic granodiorite batholith (crosses a). Post-tectonic intrusion of a granite of sheet-like form (carets b), with lamprophyre and porphyry dykes of two generations (black lines)
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FIG. 5: The Taylor Valley, viewed to the west, showing (1) the Kukri Hills to the left, and the Asgard Range to the right; (2) the Taylor Glacier, centre, flowing from the Polar Plateau into Lake Bonney; (3) Nussbaum Riegel, foreground, with numerous lamprophyre and porphyry dykes; (4) small basalt scoria cones along the southern (left) side of the Taylor Valley; (5) a large dolerite sill to the northern side of the Valley, dipping to the west. (Etched in black). — —Official U.S. Navy Photograph
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