Continuing down the Marathon Basin on Hwy 385, the southern margin on the left of the highway is seen in the above photograph, taken 24 miles south of Hwy 90. On this margin, the Cretaceous strata dip only very slightly to the south, perhaps because they are a distance from the center of the uplift. The knob in center is a small intrusion. Several similar intrusions occur along the margin.
Southern Margin of the Marathon Basin
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