Subsurface Mapping

amount angle anhydrite anomalies anticline areal areas bedding plane boundaries Bull changes characteristics clastic commonly components contour interval contour lines contours drawn control points correlation cross section cut point deposition depth determined direction drilled elevation environment erosion evaporite facies maps fault plane folding Gas Jour Geochemical geologic maps geological history geologist geophysical geophysical logging geosyncline graphic illustrate important Inasmuch indicate interpretation intersection intracratonic isolith isopach contours isopach maps key horizon Krumbein layers Levorsen limestone lithofacies lithology logs mapping unit measurements method nonclastic offlap oil-water contact onlap outcrop Paleogeographic patterns percentage Petroleum position problems rate of dip regional relationships represent reservoir rock unit sand to shale Sandstone sea level sedimentary sedimentary basin sediments shale ratio Sloss stratigraphic section stratigraphic unit strike and dip structure contour map structure maps subsurface geologist subsurface maps suggest surveys syncline tectonic thickness topographic truncation unconformity uplift upper upthrown values variations vertical