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AND PALEOCENE) AND NORTH HORN FORMATION (PALEOCENE AND UPPER CRETACEOUS)-Interbedded siltstone, sandstone, mudstone, and limestone; individual lithologic units mostly thin and lens shaped; form gentle slopes and ledges. Deposited in lakes and flood plains; limestone beds locally very rich in invertebrate fossils. Thickness 500-800 feet PRICE RIVER FORMATION OF MESA VERDE GROUP (UPPER CRETACEOUS): Bluecastle Sandstone Member Fine-to medium-grained sandstone, a single bed composed of fluviatile channel-fill deposits; forms abrupt cliffs and ledges. Thickness 75-250 feet Mudstone member Interbedded and discontinuous mudstone, siltstone, and sandstone, mostly dark gray to dark brown^-forms slopes and low ledges. Locally contains vertebrate fossils. Thickness 1 DO-400 feet CASTLEGATE SANDSTONE OF MESA-VERDE GROUP (UPPER CRETA-CEOUS) Fine-to medium-grained sandstone, local concentrations of clay galls at various horizons; forms high, abrupt cliff and bare sandstone dip slopes. Thickness 80-300 feet BLACKHAWK FORMATION OF MESA-VERDE GROUP (UPPER CRETACEOUS): Upper mudstone member and Sunnyside Member Upper mudstone member; mudstone and discontinuous sandstone, siltstone, and claystone of continental and marine origin; Sunnyside coal bed at base. Sunnyside Member: arenaceous siltstone and very fine grained to medium grained sandstone, grading downward from coarser to finer; forms abrupt cliff (middle part of Book Cliffs); sharp upper contact and transitional lower contact. Thickness of entire unit 150-350 feet Lower mudstone member and Kenilworth Member Lower mudstone member: mudstone and discontinuous siltstone, sandstone, and claystone of continental and marine origin; Rock Canyon coal bed at base. Kenilworth Member: arenaceous siltstone and very fine grained to medium coarser to finer; composed of three distinct sandstone beds, each separated by darkgray mudstone and siltstone; forms lower part of Book Cliffs; upper contact sharp, lower contact transitional. Thickness of entire unit 150-300 feet Lower tongue of Aberdeen Member Very fine grained sandstone, siltstone, and claystone containing much carbonaceous debris; forms low cuesta a few hundred feet below the base of the Book Cliffs within the Mancos Shale outcrop. Thickness 0-50 feet Figure 3. Description of rocks in the Woodside and Range Creek quadrangles,

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