Spring Valley Caverns
Spring Valley Caverns 05 Oct 2002 13.JPG: Soil profile in the sinkhole. The lower yellowish unit is a mixture of glacial material and heavily weathered limestone. The overlying soil is dark and agriculturally productive. Spring Valley Caverns, Mower or Fillmore County Minnesota. Karst, sinkholes, Agricultural, Southeastern Minnesota. 05 October 2002
Spring Valley Caverns 05 Oct 2002 13.JPG		 Spring Valley Caverns 05 Oct 2002 14.JPG: Soil profile in the sinkhole. The lower yellowish unit is a mixture of glacial material and heavily weathered limestone. The overlying soil is dark and agriculturally productive. Spring Valley Caverns, Mower or Fillmore County Minnesota. Karst, sinkholes, Agricultural, Southeastern Minnesota. 05 October 2002
Spring Valley Caverns 05 Oct 2002 14.JPG		 Spring Valley Caverns 05 Oct 2002 15.JPG: Soil profile in the sinkhole. The lower yellowish unit is a mixture of glacial material and heavily weathered limestone. The overlying soil is dark and agriculturally productive. Spring Valley Caverns, Mower or Fillmore County Minnesota. Karst, sinkholes, Agricultural, Southeastern Minnesota. 05 October 2002
Spring Valley Caverns 05 Oct 2002 15.JPG
Spring Valley Caverns 05 Oct 2002 16.JPG: Soil profile in the sinkhole. The lower yellowish unit is a mixture of glacial material and heavily weathered limestone. The overlying soil is dark and agriculturally productive. Spring Valley Caverns, Mower or Fillmore County Minnesota. Karst, sinkholes, Agricultural, Southeastern Minnesota. 05 October 2002
Spring Valley Caverns 05 Oct 2002 16.JPG		 Spring Valley Caverns 05 Oct 2002 17.JPG: Soil profile in the sinkhole. The lower yellowish unit is a mixture of glacial material and heavily weathered limestone. The overlying soil is dark and agriculturally productive. Spring Valley Caverns, Mower or Fillmore County Minnesota. Karst, sinkholes, Agricultural, Southeastern Minnesota. 05 October 2002
Spring Valley Caverns 05 Oct 2002 17.JPG		 Spring Valley Caverns 05 Oct 2002 18.JPG: The soil profile contained a bluish-black clayey unit that appeared to be a pond sediment. We hypothesize that at some point the sink hole became plugged and formed a pond. After the pond filled in the sinkhole may have covered naturally with soil, or been filled-in by post-development soil erosion. The pond sediment was loamy with some sand, mostly silt, and clay. Spring Valley Caverns, Mower or Fillmore County Minnesota. Karst, sinkholes, Agricultural, Southeastern Minnesota. 05 October 2002
Spring Valley Caverns 05 Oct 2002 18.JPG

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