Sequence and facies architecture of the upper Blackhawk Formation and the Lower Castlegate Sandstone (Upper Cretaceous), Book Cliffs, Utah, USA

摘要: Abstract High-frequency stratigraphic sequences that comprise the Desert Member of Blackhawk Formation, Lower Castlegate Sandstone, and Buck Tongue in Green River area Utah display changes sequence architecture from marine deposits to marginal an entirely nonmarine section. Facies differ above below regionally extensive boundary, which separates two low-frequency (10 6 -year cyclicity) sequences. Below this surface, high-frequency are identified interpreted as comprising highstand systems tract sequence. Each has a local incised valley system on top wave-dominated delta, coastal plain shallow preserved. Above contrast, sheet sandstone fluvial estuarine origin with laterally continuous internal erosional surfaces occurs. These boundary late lowstand early transgressive tracts The base-level generated both low- attributed crustal response fluctuations compressive intraplate stress different time scales. long-term regional subsidence rate tilting foreland basin fill. probably reflect anisotropic basement tectonism. Sequence rapidly across faulted margin underlying Paleozoic Paradox Basin. deeply eroded stack Basin, but less relief become conformable updip. features indicate Basin was more prone vertical structural movements during formation Blackhawk–Lower succession.