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Title: Origin of middle Silurian Keefer sandstone, east-central Appalachian basin

Abstract

The Keefer Sandstone of northeastern West Virginia and western Maryland was deposited in back-barrier, barrier-island, and marine shelf environments along a prograding, storm-dominated, mesotidal coastline of probable low wave energy. Back-barrier sediments were deposited in tidal-flat and lagoonal environments. Barrier-island sediments are dominated by cross-bedded sandstones deposited in deep, laterally migrating tidal inlets. Erosion accompanying the passage of a migrating tidal inlet usually resulted in the removal of underyling shoreface and shelf sands, so that tidal-inlet sandstones commonly lie with a markedly erosive contact on subtidal shales of the underlying Rose Hill Formation. Sand was transported to the shelf from the coastline by downwelling, storm-generated currents. Chamosite ooids formed in gently agitated waters immediately below fair-weather wave base. Outcrops to the east, which preserve back-barrier and barrier-island lithofacies, record a single basinward progradation of the shoreline. However, outcrops farther west, which preserve finer grained sandstone, shale, and limestone shelf lithofacies, document four progradational events in stacked coarsening-upward sequences. Each is typically capped by transgressive sandstones, commonly hematite ooid-bearing, which mark episodes of coastal retreat. Retreat occurred through shoreface and nearshore erosion. Chamosite ooids were transported basinward during coastal retreat and altered to hematite prior to burial. Transgressive shelf sands containmore » abundant coarse sand eroded from tidal-inlet deposits. Deposition of the Keefer was a response to a decrease in rate of eustatic sea level rise, or a decrease in basin subsidence rate. This was followed by deposition of the transgressive basin facies of the Rochester Shale.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of North Carolina, Chapel Hill (USA)
OSTI Identifier:
5791090
Report Number(s):
CONF-8809345-
Journal ID: CODEN: AABUD
Resource Type:
Conference
Journal Name:
AAPG Bull.; (United States)
Additional Journal Information:
Journal Volume: 72:8; Conference: AAPG Eastern section meeting, Charleston, WV, USA, 13-15 Sep 1988
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; APPALACHIAN BASIN; SANDSTONES; DEPOSITION; GEOLOGIC FORMATIONS; MARYLAND; NATURAL GAS DEPOSITS; PETROLEUM DEPOSITS; RESERVOIR ROCK; SEA LEVEL; SILURIAN PERIOD; WEST VIRGINIA; FEDERAL REGION III; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; LEVELS; MINERAL RESOURCES; NORTH AMERICA; PALEOZOIC ERA; RESOURCES; ROCKS; SEDIMENTARY BASINS; SEDIMENTARY ROCKS; USA; 020200* - Petroleum- Reserves, Geology, & Exploration; 030200 - Natural Gas- Reserves, Geology, & Exploration

Citation Formats

Meyer, S C, Textoris, D A, and Dennison, J M. Origin of middle Silurian Keefer sandstone, east-central Appalachian basin. United States: N. p., 1988. Web.
Meyer, S C, Textoris, D A, & Dennison, J M. Origin of middle Silurian Keefer sandstone, east-central Appalachian basin. United States.
Meyer, S C, Textoris, D A, and Dennison, J M. Mon . "Origin of middle Silurian Keefer sandstone, east-central Appalachian basin". United States.
@article{osti_5791090,
title = {Origin of middle Silurian Keefer sandstone, east-central Appalachian basin},
author = {Meyer, S C and Textoris, D A and Dennison, J M},
abstractNote = {The Keefer Sandstone of northeastern West Virginia and western Maryland was deposited in back-barrier, barrier-island, and marine shelf environments along a prograding, storm-dominated, mesotidal coastline of probable low wave energy. Back-barrier sediments were deposited in tidal-flat and lagoonal environments. Barrier-island sediments are dominated by cross-bedded sandstones deposited in deep, laterally migrating tidal inlets. Erosion accompanying the passage of a migrating tidal inlet usually resulted in the removal of underyling shoreface and shelf sands, so that tidal-inlet sandstones commonly lie with a markedly erosive contact on subtidal shales of the underlying Rose Hill Formation. Sand was transported to the shelf from the coastline by downwelling, storm-generated currents. Chamosite ooids formed in gently agitated waters immediately below fair-weather wave base. Outcrops to the east, which preserve back-barrier and barrier-island lithofacies, record a single basinward progradation of the shoreline. However, outcrops farther west, which preserve finer grained sandstone, shale, and limestone shelf lithofacies, document four progradational events in stacked coarsening-upward sequences. Each is typically capped by transgressive sandstones, commonly hematite ooid-bearing, which mark episodes of coastal retreat. Retreat occurred through shoreface and nearshore erosion. Chamosite ooids were transported basinward during coastal retreat and altered to hematite prior to burial. Transgressive shelf sands contain abundant coarse sand eroded from tidal-inlet deposits. Deposition of the Keefer was a response to a decrease in rate of eustatic sea level rise, or a decrease in basin subsidence rate. This was followed by deposition of the transgressive basin facies of the Rochester Shale.},
doi = {},
url = {https://www.osti.gov/biblio/5791090}, journal = {AAPG Bull.; (United States)},
number = ,
volume = 72:8,
place = {United States},
year = {1988},
month = {8}
}

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