title: Regional stratigraphic cross sections, Upper Pennsylvanian and Lower Permian strata (Virgilian and Wolfcampian Series), north-central Texas
Creators: name: Brown, L. F. (Leonard Franklin), 1928-
Publisher: name: University of Texas at Austin. Bureau of Economic Geology
Year: 1987
Subjects: subject: Geology -- Stratigraphic -- Pennsylvanian
subject: Geology -- Stratigraphic -- Permian

description: To obtain a print version of this publication visit: https://store.beg.utexas.edu/ and search for: CS0007. Plate I : Index map of regional cross sections, Virgilian-Wolfcampian Series, North-Central Texas. Plate II : Regional stratigraphic dip cross section A-A', Virgilian-Wolfcampian Series, North-Central Texas. Plate III : Regional stratigraphic dip cross section B-B', Virgilian-Wolfcampian Series, North-Central Texas. Plate IV : Regional stratigraphic dip cross section C-C', Virgilian-Wolfcampian Series, North-Central Texas. Plate V : Regional stratigraphic dip cross section D-D', Virgilian-Wolfcampian Series, North-Central Texas. Plate VI : Regional stratigraphic dip cross section E-E', Virgilian-Wolfcampian Series, North-Central Texas. Plate VII : Regional stratigraphic dip cross section F-F', Virgilian-Wolfcampian Series, North-Central Texas. Plate VIII : Regional stratigraphic dip cross section G-G', Virgilian-Wolfcampian Series, North-Central Texas. Plate IX : Regional stratigraphic dip cross section H-H', Virgilian-Wolfcampian Series, North-Central Texas. Plate X : Regional stratigraphic dip cross section I-I', Virgilian-Wolfcampian Series, North-Central Texas. Plate XI : Regional stratigraphic dip cross section J-J', Virgilian-Wolfcampian Series, North-Central Texas. Plate XII : Regional stratigraphic dip cross section K-K', Virgilian-Wolfcampian Series, North-Central Texas. Plate XIII : Regional stratigraphic dip cross section L-L', Virgilian-Wolfcampian Series, North-Central Texas. Plate XIV : Regional stratigraphic dip cross section M-M', Virgilian-Wolfcampian Series, North-Central Texas. Plate XV : Regional stratigraphic dip cross section N-N', Virgilian-Wolfcampian Series, North-Central Texas. Plate XVI : Regional stratigraphic strike cross section 1-1', Virgilian-Wolfcampian Series, North-Central Texas. Plate XVII : Regional stratigraphic strike cross section 2-2', Virgilian-Wolfcampian Series, North-Central Texas. Plate XVIII : Regional stratigraphic strike cross section 3-3', Virgilian-Wolfcampian Series, North-Central Texas. Plate XIX : Regional stratigraphic strike cross section 4-4', Virgilian-Wolfcampian Series, North-Central Texas. Plate XX : Regional stratigraphic strike cross section 5-5', Virgilian-Wolfcampian Series, North-Central Texas. Plate XXI : Regional stratigraphic strike cross section 6-6', Virgilian-Wolfcampian Series, North-Central Texas. Plate XXII : Regional stratigraphic strike cross section 7-7', Virgilian-Wolfcampian Series, North-Central Texas. Plate XXIII : Regional stratigraphic strike cross section 8-8', Virgilian-Wolfcampian Series, North-Central Texas. Plate XXIV : Regional stratigraphic strike cross section 9-9', Virgilian-Wolfcampian Series, North-Central Texas. Plate XXV : Typical electric logs of Virgilian and Wolfcampian facies, North-Central Texas. Plate XXVI : Inferred depositional systems tracts, lower and middle Virgilian Series, North-Central Texas. Plate XXVII : Inferred depositional systems tracts, upper Virgilian and Wolfcampian Series, North-Central Texas
description: A regional network of 14 dip (E-W) and 9 strike {N-S) stratigraphic cross sections correlates upper Pennsylvanian (Virgilian) and lower Permian (Wolfcampian) strata throughout the subsurface in all or parts of 28 counties of North-Central Texas. The network covers 22,000 mi (57,000 km) and was constructed by combining outcrop data with electric log data from 1,185 weils along 2,000 mi (3.200 km) of cross sections to correlate about 20 limestone units. The network was further verified by correlating the limestones on electric logs from 4,000 additional off-section wells for a total of more than 5,100 control points. Cores and samples were used locally to calibrate the lithic interpretation of electric logs. The cross sections are published with a horizontal scale of approximately 6 mi/inch (4.2 km/cm) and a vertical scale of 200 ft/inch (26.6 m/cm). Regionally persistent limestone units (1) provide a reliable subsurface correlation network, (2) comprise a stratigraphic framework for facies mapping, (3) equate outcrop type sections with subsurface equivalents, (4) document major vertical and lateral variations within principal lithogenetic sequences, and (5) permit integration of a variety of subsurface and surface geologic data. The cross sections define 16 principal and several lesser lithogenetic units, each composed of cyclic coastal onlap limestone sequences and progradational/aggradational terrigenous clastic sequences. The progradational/aggradational clastic sequences are composed of platform fluvial, fan-deltaic, deltaic, and interdeltaic systems and shelf-margin deltaic, interdeitaic, slope, and basinal sequences, as well as some local contemporaneous shelf and shelf-edge limestone systems. Coastal onlap limestone sequences contain principaily transgressive, aggradational, and progradational limestone facies and thin, discontinuous, basal transgressive sandstone and shale facies deposited within nearshore, shelf, shelf-edge, and slope systems. The cyclic sequences were controiled by variations in relative sea level resulting from an interplay between variable rates of tectonic subsi- dence and tilting, compaction subsidence, sediment supply, and eustatic sea-level variations. Deposi- tional sequences were correlated westward from outcrop, across the Eastern Shelf, over shelf edges, and down the slope to pinch out on the floor of the Midtand Basin. Many tectonic and paleobathymetric elements are clearly delineated: the northern terminus of the Fort Chadbourne Fault Zone