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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
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Title: Sandstone
(Upper Pennsylvanian), Northwestern Oklahoma
Author(s):
Abstract:
Approximately 20 sandstone
ridges of the Cottage Grove
Sandstone
, encased in shale and mudstone, can be identified from subsurface control within a 504 mi2 (1,305 km2) study area in northwestern Oklahoma. The
sandstone
ridges range in width from 0.6 to 2.5 mi (1 to 4 km) and in length form 2.5 to more than 18.6 mi (4 to more than 30 km). Maximum
sandstone
thickness is about 100 ft (30 m). The
sandstone
ridges trend generally northeast-southwest, oblique to present structural strike. The sandstones show an overall fining-upward trend unlike many reported shelf deposits. A general vertical facies sequence from an axial core on a sand ridge consists of (1) mudstone (basal), (2) wavy bedded
sandstone
/shale, (3) alternating massive
sandstone
containing sy
metrical oscillation ripples and flaser-bedded and horizontally bedded
sandstone
with herringbone cross-stratification, and (4) wavy bedded
sandstone
/shale, which grades into the mudstone facies above. A fossiliferous packstone-grainstone facies also occurs as thin sheets in some
sandstone
ridges as well as interridge areas.
The Cottage Grove Sandstone
ridges were deposited in a shelf environment. Inferred depositional processes include reworking by tidal surge and ebb, winnowing of ridge crests by wave action during storms, and, perhaps, episodic delivery of sediment to the shelf by storm-induced currents. The fining-upward trend in the
sandstone
bodies suggests deposition in a transgressive setting. The characteristics and inferred processes of the Cottage Grove
Sandstone
bodies are consistent with an origin similar to modern shoreface-detached sand ridges.
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