Hardinville Anticline (New)
Part of the La Salle Anticlinorium
Location
Southwestern Crawford County (H-8)
References
Blatchley 1912, 1913, Cady 1920, Potter 1956, Bristol and Buschbach 1973, Bristol and Howard 1976, Stevenson et al. 1981, Treworgy 1981, Howard and Whitaker 1988
Description
The Hardinville Anticline, named by Howard and Whitaker (1988), is part of the La Salle Anticlinorium. This anticline was mapped but not named by many previous geologists. Treworgy (1981) listed it as the Main structure under the heading "significant unnamed structures." It lies on the upper limb of the west-facing Charleston Monocline, which trends slightly west of north through Lawrence and Crawford Counties. The monocline has more than 1,600 feet (480 m) of relief on pre-Pennsylvanian strata in this area. The axis of the Hardinville Anticline strikes about N30°W and aligns with that of the Oblong Anticline to the northwest. The Hardinville Anticline is offset to the east of the Bridgeport Anticline.
The Hardinville Anticline has been mapped at numerous structural horizons. It has more than 200 feet (60 m) of closure on top of the Galena (Trenton) Group (Bristol and Buschbach 1973) and on the base of the New Albany Group (Stevenson et al. 1981). Closure apparently is less on the Ste. Genevieve Limestone (Bristol and Howard 1976) and on the Chesterian Downeys Bluff Limestone (Howard and Whitaker 1988). The anticline is not shown clearly on the Beech Creek ("Barlow") maps (ISGS open files) because the Beech Creek is missing below the sub-Pennsylvanian unconformity on the structure. The anticline has an irregular outline and less than 50 feet (15 m) of closure on the Herrin Coal Member (Pennsylvanian; Potter 1956) (fig. 40). Potter had many control points, so the loss of closure evidently is real and reflects pre-Pennsylvanian uplift of the anticline.
A significant portion of the 51 million barrels of production at the Main Consolidated Oil Field has come from lower Pennsylvanian, Chesterian, Valmeyeran, and Galena (Trenton) reservoirs in structural traps on the Hardinville Anticline.
Figure(s)
|
