• Surficial Geology of Wisconsin

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Surficial Geology of Michigan

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Surficial Geology of South Dakota

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Surficial Geology of Minnesota

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Surficial Geology of Ohio

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Surficial Geology of Indiana

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Surficial Geology of Illinois

    This raster is a highly detailed map of geologic materials at the surface (delineations made from maps at 1:24,000 to 1:12,000 scale). The smaller extent… Read More

  • Iowa Soil Drainage Class Maps [gSSURGO]

    “Drainage class (natural)” refers to the frequency and duration of wet periods under conditions similar to those under which the soil formed. Alterations of the… Read More

  • Iowa Depth to Water Table Maps [gSSURGO]

    “Water table” refers to a saturated zone in the soil. It occurs during specified months. Estimates of the upper limit are based mainly on observations… Read More

  • Iowa Soil pH Maps [gSSURGO]

    Soil reaction is a measure of acidity or alkalinity. It is important in selecting crops and other plants, in evaluating soil amendments for fertility and… Read More