Thermal maturity patterns in Pennsylvanian coal-bearing rocks in Alabama, Tennessee, Kentucky, Virginia, West Virginia, Ohio, Maryland, and Pennsylvania
<div data-canvas-width="402.1833333333333" data-angle="0" data-font-name="g_font_9">Thermal maturation patterns of Pennsylvanian strata in the Appalachian…
Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.
Figure 4. Map showing smoothed percent-vitrinite-reflectance (%Ro) isograds for Lower Pennsylvanian coals in the Appalachian basin, based on 376 individual and averaged percent-vitrinite-reflectance measurements obtained from the Penn State Coal Sample Bank and Database (Penn State Earth and Mineral Sciences Energy Institute, 2011), unpublished databases (James C. Hower, unpub. data, 2005; J.C. Hower and Cortland F. Eble, Kentucky Geological Survey, unpub. data, 2005; John C. Crelling, Southern Illinois University at Carbondale, unpub. data, 2005; William C. Grady, West Virginia Geological and Economic Survey, unpub. data, 2005; U.S. Geological Survey, unpub. data, 2005), two unpublished doctoral dissertations (Hower, 1978; Rimmer, 1985), and published sources (see appendix 1). U.S. Geological Survey Professional Paper 1708-F.2 EXPLANATION Areal extent of the Appalachian basin and eastern part of the Black Warrior basin Vitrinite reflectance isograd (in percent, %Ro) for Pennsylvanian coal strata—Isograds are shown in 0.2-%Ro intervals. Dashed where approximate Sample locations—Values are in percent vitrinite reflectance (%Ro). Values are in groups of 0.2-%Ro intervals. See appendix 1 for complete data Allegheny structural front (ASF) Structural discontinuity—P-WSD, Pittsburgh-Washington; T-MUSD, Tyrone-Mount Union Thrust fault—CT, Chattanooga; HV, Hunter Valley; PMT, Pine Mountain; STC, St. Clair Fault—AF, Akron; HF, Highlandtown; PF, Pottchunk; RF, Russell Fork; SF, Suffield; STF, Smith Township Less than 0.59 0.60 to 0.79 0.80 to 0.99 1.20 to 1.39 1.00 to 1.19 1.60 to 1.79 1.40 to 1.59 1.80 to 1.99 2.50 to 2.99 100 MILES 100 KILOMETERS Base from U.S. Geological Survey digital data, 2001, 1:7,000,000 Albers Equal Area Conic projection Standard parallels 35°00'N and 43°00'N Central meridian 81°00'W Latitude of origin 37°30'W ATLANTIC OCEAN LAKE ERIE LAKE MICHIGAN Kentucky Illinois Georgia Alabama Virginia Indiana Mississippi Tennessee Pennsylvania South Carolina West Virginia Michigan New Jersey Connecticut Delaware Washington, D.C. New York Rhode Island Ohio Maryland North Carolina Missouri Arkansas Iowa PF T-MUSD P-WSD HF SF STF ASF ASF ASF PMT RF HV STC CT HF AF 90° 85° 80° 75° 70° 35° 40°