Big Basin

Big Basin (HM7G9)

Location: Ashland, KS 67831 Clark County
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Country: United States of America
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N 37° 14.376', W 100° 0.026'

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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 Kansas, Big Basin was formed thousands of years ago by the dissolving and collapse of massive gypsum and salt formations lying several hundred feet below the surface.

Just beyond the east rim of Big Basin is a smaller sink known as Little Basin. It contains "St. Jacob's Well," a pool of water never known to have gone dry. Archeological finds indicate that St. Jacob's Well has attracted visitors for many centuries, beginning with prehistoric peoples and continuing into the early days of European settlement.

Although located on the eastern edge of the High Plains, Big Basin and Little Basin exhibit the physical characteristics of the Red Hills region located a short distance to the south and east, where rock formations of white gypsum and gray dolomite alternate with brick-red shales, siltstones, and sandstones to create a visually striking butte-and-mesa topography unlike any other in Kansas.
HM NumberHM7G9
Series This marker is part of the Kansas: Kansas Historical Society series
Marker Number77
Placed ByKansas State Historical Society and Kansas Deptartment of Transportation
Marker ConditionNo reports yet
Date Added Monday, September 1st, 2014 at 12:58am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)14S E 411264 N 4121921
Decimal Degrees37.23960000, -100.00043333
Degrees and Decimal MinutesN 37° 14.376', W 100° 0.026'
Degrees, Minutes and Seconds37° 14' 22.56" N, 100° 0' 1.56" W
Driving DirectionsGoogle Maps
Area Code(s)620
Closest Postal AddressAt or near 148-170 US-283, Ashland KS 67831, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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