Geology Of The Barber Quadrangle, Sebastian County And Vicinity, Arkansas
Boyd R. Haley
Temporarily Out of Print
The Barber quadrangle is in west-central Arkansas between 35°00'00" and 35° 15'00" north latitudes and 94°00'00" and 94°15'00" west longitudes. It includes an area of about 244 square miles in parts of Sebastian, Scott, Logan, and Franklin Counties.
Sedimentary rocks of Middle Pennsylvanian age and unconsolidated sediments of Quaternary age are exposed at the surface and sedimentary rocks of Middle and Early Pennsylvanian age have been penetrated by wells drilled in or near the quadrangle. The rocks of Pennsylvanian age, consisting of shale, siltstone, sandstone, and minor amounts of limestone and coal, belong to the Morrow Series and to the Atoka, Hartshorne, McAlester, and Savanna Formations.
The rocks in the quadrangle have been folded into eastward- and northeastward-trending synclines and anticlines. Structural relief, as measured from the base of the Hartshorne Sandstone on the reverse-faulted Washburn anticline to the base of the Hartshorne Sandstone in the Bloomer syncline, is estimated to be more than 12,000 feet.
Coal beds are present in the Atoka, Hartshorne, McAlester, and Savanna Formations but only the Lower Hartshorne coal bed in the lower part of the McAlester Formation and the Paris coal bed in the upper part of the Savanna Formation have been economically important. Remaining reserves of coal in the Lower Hartshorne coal bed are estimated to be about 82 million short tons. All the coal is of low-volatile bituminous rank.
The first commercial quantity of natural gas found in Arkansas was discovered in the Mansfield gas field in 1902 in the Barber quadrangle. The two other gas fields subsequently found in the Barber quadrangle are the Gragg gas field, discovered in 1955 and the Booneville gas field, discovered in 1958. All natural gas in the Barber quadrange has been produced from sandstone units in the middle three-fifths of the Atoka Formation.
Poor quality building stone can be obtained from the Atoka, Hartshorne, and Savanna Formations. Road metal can be obtained from all formations and from the gravel-bearing parts of the alluvial deposits.
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