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High-frequency stratigraphic sequences that comprise the Desert Member of the Blackhawk Formation, the Lower Castlegate Sandstone, and the Buck Tongue in the Green River area of Utah display changes in sequence architecture from marine deposits to marginal marine deposits to an entirely nonmarine section. Facies and sequence architecture differ above and below the regionally extensive Castlegate sequence boundary, which separates two low-frequency (106-year cyclicity) sequences. Below this surface, high-frequency sequences are identified and interpreted as comprising the highstand systems tract of the low-frequency Blackhawk sequence. Each high-frequency sequence has a local incised valley system on top of the wave-dominated...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Blackhawk Formation,
Castlegate Sandstone,
Sedimentary Geology,
basement,
facies,
A case study of Munsell color measurements from the Eocene Colton and Green River Formations in central Utah shows how easily stereoscopic triaxial scatterplots can display the limited overlap of colors within lacustrine and alluvial facies. Grays, drabbish yellow-greens, greens, and 10 YRs are associated with lacustrine limestones and other known lacustrine facies, whereas other yellow-reds and reds are predominantly associated with terrestrial deposits, including fluvial sandstones. Lake beds in Colton Formation show a greater variety of color than those in the Green River Formation, both in terms of a greater range of hues and more extreme lightness and darknesses, apparently reflecting the fact that the Green...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Colors,
Colton Formation,
Facies,
Green River Formation,
Munsell color system,
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