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Depositional Systems Of The Sells And Cecil Sandstones, Atoka Formation (Pennsylvanian), Eastern Crawford And Western Franklin Counties, Arkansas, Chris A. Cardneaux
Depositional Systems Of The Sells And Cecil Sandstones, Atoka Formation (Pennsylvanian), Eastern Crawford And Western Franklin Counties, Arkansas, Chris A. Cardneaux
Journal of the Arkansas Academy of Science
The Cecil and Sells sandstones of the Atoka Formation (Pennsylvanian) were studied in the subsurface of eastern Crawford and western Franklin Counties. Sand of the Cecil sandstone was delivered to a high destructive, wave dominated delta southeast of Fort Smith and reworked laterally by longshore currents to form coastal barrier sands to the east. The Sells sandstone unit accumulated as a distributary channel system that bifurcates to the southeast and southwest. The interdistributary areas are characterized by immature sands interbedded with shales. These immature sands were deposited by crevasse splays and reworking of the distributary mouth bars by marine processes …
Geometry And Depositional Systems Of The Orr And Patterson Sands, Bloyd Formation (Pennsylvanian), Eastern Franklin And Western Johnson Counties, Arkansas, Michael E. Corbin
Geometry And Depositional Systems Of The Orr And Patterson Sands, Bloyd Formation (Pennsylvanian), Eastern Franklin And Western Johnson Counties, Arkansas, Michael E. Corbin
Journal of the Arkansas Academy of Science
The Orr and Patterson sandstones occur in the Trace Creek Shale Member, Bloyd Formation, in surface exposures on the northern Arkansas structural platform. The Orr sandstone exhibits regional thickening trends to the south and southeast into the Arkoma Basin as shown by isolith maps for the area studied. The depositional environment that formed this sandstone comprised fluvial or deltaic channels feeding a destructive delta system to the southeast. The Patterson sandstone lies stratigraphically above the Orr sandstone, and is confined essentially to Franklin and Johnson counties. It is poorly developed or not present in Washington and western Crawford Counties. The …
Structural Geology Of The Brentwood-St. Paul Area, Northwest Arkansas, Mikel R. Shinn
Structural Geology Of The Brentwood-St. Paul Area, Northwest Arkansas, Mikel R. Shinn
Journal of the Arkansas Academy of Science
Photogeologic and field mapping of a 530 mi² area in southeastern Washington and southern Madison Counties, Arkansas, indicates that post-Atoka structural deformation occurred primarily through differential uplift of basement fault blocks. Northeast and east trending basement faults and fracture systems are present. Northeast trending features are related to the major fracture systems of the stable continental interior. They were initiated by shearing during Pre-Cambrian time and have subsequently acted as crustal zones of weakness along which mostly vertical movement has occurred. East trending basement faults may have originally developed as a result of tension between the stable Ozark uplift and …