P. W. Schmidt 1978 <p>This map shows the relative amounts of soil and hard bedrock within the upper 6 feet (1.8 m) of the land surface.&nbsp; (See schematic section.)&nbsp; It provides information useful for broad-scale land-use decisions.&nbsp; The map is based on reconnaissance field studies and aerial-photograph interpretation.&nbsp; The depth of soil and weathered rock was measured directly in roadcuts and other excavations and was estimated from seismic profiles in areas of few or no excavations or outcrops.&nbsp; Secondary characteristics of map units, such as percentage of outcrop in a given area, steepness of slope, type and amount of vegetation cover, and general appearance of the landscape, were used in drawing the boundaries between map units.&nbsp; Localities were assigned to the different map units by field inspection; lines separating the different map units were then drawn by aerial-photograph interpretation and were transferred photogrammetrically to the base map.</p> application/pdf 10.3133/mf998 en U.S. Geological Survey Reconnaissance map showing relative amounts of soil and bedrock in the mountainous part of the Pinewood Lake-Carter Lake Reservoir quadrangles, Boulder and Larimer counties, Colorado reports