Plate 1, Data Base, Plate 2, Bedrock geology, Plate 3, Surficial geology, Plate 4 Bedrock topography and Depth-to-bedrock, Scale 1:100,000. Plates have individual authorship.; Surface and bedrock geology of Houston County, Mn., also includes data-base information, bedrock topography, depth-to-bedrock and structural tops of bedrock strata.; THE HOUSTON COUNTY BOARD OF COMMISSIONERS, AND THE MINNESOTA LEGACY AMENDMENT'S CLEAN WATER FUND.