GEOLEX

Summary of Citation: Clubhouse

Publication:
Gohn, G.S., 1992, Revised nomenclature, definitions, and
   correlations for the Cretaceous formations in USGS-Clubhouse
   Crossroads #1, Dorchester County, South Carolina: U.S.
   Geological Survey Professional Paper, 1581, 39 p.

Usage in Publication:
Clubhouse Formation*

Modifications:	Geologic Province:	Dominant Lithology:
Named Biostratigraphic dating	Atlantic Coast basin	Silt Clay Sand

Summary:
Named for hamlet of Clubhouse Crossroads, Dorchester Co., SC. Formerly included in the middle part of the Cape Fear Formation. Type section is Clubhouse Crossroads #1 drill core, interval from 2,417 to 2,338 ft. Occurs in subsurface of southeastern SC (southern Dorchester Co.). Consists of light-gray and pale-olive silt and sand containing locally abundant sand-sized mica, lignitic wood, and other plant material; grayish-olive to medium-dark-gray silty clay also containing abundant mica and lignitic material as well as common small pyrite clusters. Characterized by flaser and lenticular bedding; cross lamination commonly present in sand beds and lenses. Silts and fine sands alternate in thin beds. Thickness is 79 ft in type section. Underlying contact with Beech Hill Formation discerned by color change in core; upper contact with Cape Fear Formation is sharp and discerned by abrupt color change. Report includes correlation chart, fossil zonation chart, and cross section. Contains sand-sized fragments of mollusks (oysters), ostracodes, calcareous nannofossils, and sparse dinoflagellates. Hattner and Wise (1980) first reported calcareous nannoflora from single sample of sediment now assigned to Clubhouse at 2377 ft in core hole and identified LITHRAPHIDITES ACUTUS and L. ALATUS, thus assigning a late Cenomanian age to the sample. Valentine (1982, 1984) extended known distribution of L. ACUTUS and L. ALATUS in the core and also reported other species, including EIFFELLITHUS EXIMIUS and COROLLITHION ACHYLOSUM. The first-appearance datum of E. EXIMIUS is routinely placed at or slightly below middle of Turonian (Manvit and others, 1979; Perch-Nielsen, 1985). Because top of COMPLEXIOPOLLIS-ATLANTOPOLLIS zone is known to occur near middle of Turonian (Valentine, 1984), upper part of Clubhouse is assigned a Turonian age. Below 2369 ft, data are equivocal regarding Cenomanian or Turonian age. Perch-Nielsen (1985) restricted L. ALATUS, L. ACUTUS, and C. ACHYLOSUM to Cenomanian and older beds. However, Valentine (1984) reported L. ACUTUS and C. ACHYLOSUM from Turonian sections in TX and NJ. To accommodate uncertainty, age of Clubhouse is assigned a Late Cretaceous (late Cenomanian(?) and Turonian) age.