Depositional environments and sedimentology of Vinita Beds, Richmond basin, Virginia
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:5756667
The Carnian (middle to late Middle Triassic Age) Richmond basin of northeast Virginia is the oldest of the exposed Newark rift basins of the eastern seaboard. These basins formed during the Mesozoic divergence of the continents. As presently defined, the Richmond basin is a large synclinal feature measuring 32 mi (53 km) long by 8 mi (13 km) wide, and is located west of Richmond, Virginia, and east of Amelia, Virginia. Sediments of the Richmond basin have been assigned to the Richmond Group and have been stratigraphically subdivided into the following informal units, oldest to youngest: coarse boulder breccias, coal measures, Vinita Beds, and Otterdale Sandstone. The Vinita Beds are composed of arkosic sandstones, shales, siltstones, and minor amounts of coal, and are mineralogically immature. They are composed to angular to subrounded rock fragments, quartz, and feldspars, and are high micaceous and kaolinitic. In places, feldspars make up as much as 50% of the rock. Sandstones and conglomerates are cross-bedded and channeled, and shales and siltstones are thinly laminated. The Vinita Beds are rich in fossil fish, branchiopods, and plant fragments. These rocks were deposited in braided streams as well as in paludal and possible lacustrine environments in a humid and heavily vegetated setting.
- Research Organization:
- Texaco, New Orleans, LA
- OSTI ID:
- 5756667
- Report Number(s):
- CONF-850322-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 69:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Thesis/Dissertation
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Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:6827666
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·
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· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:6077263
Depositional setting of Ordovician and Cambrian rocks in central Appalachian basin along a section from Morrow County, Ohio, to Calhoun County, West Virginia
Conference
·
Mon Aug 01 00:00:00 EDT 1988
· AAPG Bull.; (United States)
·
OSTI ID:5794168
Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALLUVIAL DEPOSITS
FEDERAL REGION III
FOSSILS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
MESOZOIC ERA
NORTH AMERICA
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SHALES
SILTSTONES
TRIASSIC PERIOD
USA
VIRGINIA
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALLUVIAL DEPOSITS
FEDERAL REGION III
FOSSILS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
MESOZOIC ERA
NORTH AMERICA
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SHALES
SILTSTONES
TRIASSIC PERIOD
USA
VIRGINIA