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This marker stands within a geologic feature known as the Big Basin, which is a sinkhole or "sink" about a mile in diameter and more than a hundred feet deep. Although it has the appearance of a valley, it is entirely surrounded by higher ground. Like several other smaller sinks in this section of from hmdb.org
Big Basin and Little Basin are the two best known sinkholes in the Red Hills, a karst area at the southern border of Kansas. Big Basin is about 1,600m in diameter and 30m deep, Little Basin is about 256m diameter and 10m deep. Both are dolines, formed by underground solution and the collapse of the from showcaves.com