Fig. 2From: Using geophysical logs to identify Milankovitch cycles and to calculate net primary productivity (NPP) of the Late Permian coals, western Guizhou, ChinaLithological and geophysical logs of the three Late Permian coal seams from the Songhe mining area, western Guizhou. DLW = Apparent resistivity; DEN = Gamma-gamma (Density); GR = Natural-gammaBack to article page