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ERAYEARS BEFORE PRESENTRATON BASINDENVER BASINNORTH PARK BASIN11M25M40M60MPOISON CYN65MARAPAHOE FM.LARAMIE FM.TROUT CREEK SS.LEWIS SH ILES FM.CLIFF HOUSETOW CREEKPT LOOKOUTCARLISLE SH.CODELL SS.CODELL SS. FRONTIER SS.COLO. GP. COLO. GP. MOWRY SH.DAKOTA SS.DAKOTA GP. MUDDY SS.135MPERIODPLIOCENEPICEANCE CREEK BASINSAND WASH BASINSAN JUAN BASINDAWSON FM.CASTLE ROCK CONGL.BROWNS PARK FM.GREEN RIVER FMMIOCENEOLIGOCENEMIDDLE AND UPPER MESOZOICCRETACEOUSLOWERPALEOCENENIOBRARA FMLARAMIE-FOX HILLSPIERRE SHALEDENVER FM.DAKOTA SS.NIOBRARA FM.CENEZOICEOCENESAN JOSE FORMATIONANIMAS FORMATIONKIRKLAND SHALEFRUITLAND FORMATIONLOWER MANCOS SHALEUPPERDAKOTA SANDSTONEPICTURED CLIFFS SANDSTONEMENEFEE CREVASSE CYNMANCOS SHMESA VERDE GROUPGALLUP SANDSTONEMANCOS SHALEMOWRY SH.UINTA FMGREEN RIVER FMWASATCH FMFT UNION FMTERTIARY VOLCANICSRATON FM. VERMEJO FM.TRINIDAD FM.PIERRE SHALESEGO SSCASTLEGATE SS.OHIO CK CONGL.MESA VERDE GP.WILLIAMS FORK FM.ILES FM.MESA VERDE GP.WILLIAMS FORK FM.WASATCH FM.FT. UNION FMOHIO CK. CONGL.LANCE FM.MANCOS SHALEDAKOTA GP.NO. PARK FM.RABBIT EARS VOLCANICSCOALMONT FM.PIERRE SHALENIOBRARA FM.DAKOTA GP.FOX HILLS FM.LEWIS SHALESIMPLIFIED COLORADO STRATIGRAPHIC NOMENCLATURE CHARTCRETACEOUS AND YOUNGER ROCKSWITH CBM POTENTIAL