Geologic map of the Crooks Peak quadrangle, Fremont and Sweetwater Counties, Wyoming
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The Thaumasia quadrangle lies on the south flank of the Tharsis dome (Hord and others, 1974), a large bulge in the crust of Mars extending more than 5,000 km northward from the center of the quadrangle. The major structure imposes a generally southward slope across the entire quadrangle. Topography along the east-central border of the Thaumasia quadrangle exhibits curved scarps and lowlands concentric with the Argyre basin. Four regions within the Thaumasia quadrangle are defined on the basis of the dominant geologic unit exposed. Three of these regions form arcuate patterns around the south flank of the Tharsis dome, and the fourth is a arcuate region concentric with the Argyre basin.