U.S. DEPARTMENT OF THE INTERIOR BULLETIN 1839–K U.S. GEOLOGICAL SURVEY PLATE 1 ALLEGHENY STRUCTURAL FRONT 7t 8t KMM ARS (Kerr-McGee) (Arco No. 1 Steele) No. 1 Martin Bedford Co., Pa. 6t Composite outcrop section KMS Bedford Co., Pa. Outcrop section above drill hole above drill hole from Thomp- Blind thrust fault underlying the (Kerr-McGee) ROME TROUGH measured by Wallace de Witt, son (1963) and Knowles (1966) SE Allegheny structural front (see No. 1 Schellsburg (Restored about 22 mi (35.4 km) Bedford Co., Pa. Jr. (unpub. data, 1969) Berg and others, 1980); 8 mi (Restored about 10 mi (16.1 km) southeastward to original posi- C' NW (12.9 km) shortening (Berg and (Restored about 4 mi (6.4 km) south- southeastward to original posi- tion; bed thickness corrected for others, 1980) C ) eastward to original position; bed tion; bed thickness not corrected 30° dip in measured outcrop a t a thickness not corrected for dip) for dip) section of Gatesburg Formation d ' . (Knowles, 1966) A b 5 – u FEET A p AS n h 3000 Thrust fault underlying Broad- t u i Thrust fault underlying Wills OHIO-WEST VIRGINIA HINGE ZONE , (Amoco No. 1 Svetz) r WOOSTER ARCH w top block of Shumaker and oth- e Mountain block of Shumaker e i Somerset Co., Pa. d T ers (1985); 20 mi (32.2 km) y and others (1985); 10 mi (15.1 R 9t . shortening (Berg and others, T . km) shortening (Berg and oth- SD R R R ( R 1980) 2 R R R ers, 1980) (Shell Oil BBW R R R No. 1 Duckworth) A A R I e R I (Belden and Blake and Company n D N sto N Hampshire Co., W. Va. 3 d R 12,000 I n N 4 Sa A 1 ra R G No. 9 Limited Partnership V aro 4000 A c L MM s R R u L (Restored about 20 mi (32.2 km) HM T I WS Y No. 1–381 Westfall) Y V R (Management Control S R (Humble No. 1 Minesinger) T southeastward to original position; (Wiser Oil No. 1–A Smith) N Stark Co., Ohio A No. 3 Murray) S N E Hancock Co., W. Va. R M Medina Co., Ohio FEET R E bed thickness not corrected for dip) T W Columbiana Co., Ohio usca P 3000 n R rora S 981) ormatio andsto ? FEET wski (1 R uniata F R ne ? FEET A J A ro I t I io A f P ? I 6000 o 3) R N e R N it 98 R R I m (1 R 5000 N olo rs R A I s D the R R R R R ? Tuscaro LOWER G le o R ra Sand FEET V na d stone G ey an 13,000 RR L R g O R r I e I FEET R B R R R Y d 2000 I an R 5000 SILURIAN V R H R S R R V 5000 ? R R T O N R T S agle R R R R Juniata R S N E R E Bald R R E E tion R Formation W p a R P ou R R orm W Gr F Clinton 4000 R R R Juniata R R R R R R R R Formation R R R R R R R Sandstone R R R 6000 R Tuscarora 7000 R R R R epper R 14,000 R R 3000 acker shell of P 6000 R Bald Eagle R P (1953) ation Reedsville R R R and others 6000 a Form FEET F R Formation R Juniat Shale 1 R R e and 0 R R R R R LOWER "Clinton" sandston Oswego Sa sens (1977) ndstone UPPER SILURIAN shale of Jans F R 5000 2 ? R R ORDOVICIAN Queenston Shale ? ? Reedsville 8000 Shale 7000 15,000 4000 ville Shale 7000 ? 7000 Reeds tes Shale Reeds 8000 UPPER nton Group An ? ville ville Shale Tre 1 Sha ORDOVICIAN Reeds 944a, b) marker of Stith (1979) 1000 ? le of Kay (1 ? ? Coburn f1 ? 6000 Limestone Antes Shale s Shale Salona Limestone Bentonite R of Thompson (1963) Ante Trenton Group Trento S3 metabentonite ? f2 n Group of of Perry (1964) ? mestone marker of Stith (1979) Coburn Limestone Shale marker of Stith (1979) 9000 Coburn Li Nealmont ? Kay (1944 1 Trenton G Dolly R ? Utica Bentonite No. 0 F a, b) roup idge Formation Limestone 16,000 ß marker of Stith (1979) Salona Limestone 3 of Perry (1972) 5000 Trenton Limestone rker of Stith (1979) 8000 of Thompson (1963) ß ma Nealmont Limestone S me 8000 Black River Group ? 2 tabentonite of Perr Linden Hall and Snyder Ls., undiv. y (1964) 9000 ß marker of Stith (1979) Black River Group Black River Group Nealmont Lim MIDDLE er Member Clover Member 2000 Hatter Limestone estone Black River Limestone Clov Clover Member ORDOVICIAN Loysburg Formation Milroy Member ? Black River Loysburg Formation Milroy DATUM Group 7000 Loysburg Formation f3 Wells Creek Formation Loysburg Formation DATUM Member MIDDLE DATUM Milroy Member DATUM Wells Creek Formation ORDOVICIAN Knox Dolomi 10,000 17,000 B zone of Calvert (1964) te of Janssens (1973) Ros e Run Sandstone Knox Dolomite of Janssens (1973) f Bellefonte 6000 Krysik sandstone of driller's usage Member 4 9000 9000 Knox Dolomite 10,000 UPPER Conasauga Beekmantown Formation of Janssens (1973) ? at Group unconformity ydritic dolomite occurs 3000 F4 CAMBRIAN TD 10,387 Anh s ? Rome Formation ? ? se stratigraphic position of Janssens (1973) ? the 1 ? ? M ? the Texas Eastern No. A– ? ount Simon Sandstone TD 7961 ? in ated ? ? Knox unconformity Schellsburg drill hole, loc ? the west. ? ? ? <1 mi to n MIDDLE ? f5 antow TD=Total Depth Beekm FEET Beekmantown Group PROTEROZOIC ? 18,000 ? Group 0 7000 10,000 Nittany F ? f5 5 Macrofossils report- TD 7040 10,000 S S S S S ? Dolomite 11,000 ? ? n ed from a correlative antow 4000 measured section in ? Beekm LOWER Group Bedford County by TD 10,242 Knowles (1966) and ORDOVICIAN ICIAN ? Stonehenge RDOV F Spelman (1966) ? ? DLE O IAN ? rke 6 Limestone? 1 ? MID DOVIC La e The Trenton Group of Kay (1944a, b) shown here differs slightly from Kay's original definition. ER OR lomit The difference results because we follow Rones (1969), who moved the base of the Trenton Group ? LOW Do 1000 19,000 ber ? of Kay (1944a, b), and the associated widespread unconformity, about 30 to 60 ft (9–18 m) Beekmantown S S ? Mem ? 11,000 omite upsection from the base of the Oak Hall Member of the Nealmont Limestone of Kay (1944a, b) to Group Sulfur occurs in this stratigraphic position in s Dol 12,000 ? the Texas Eastern No. A–1 Schellsburg drill Mine ? the base of the underlying Centre Hall Member of the Nealmont Limestone of Kay (1944a, b). hole, located <1 mi to the west. ? 2000 ndy ? er sa Gatesburg ? Upp er memb Formation ? ? esburg Ore Hill Limestone Member Gat n ? rmatio f6 Fo EXPLANATION 20,000 TD 11,850 ? ? G 3000 13,000 ate ? IGNEOUS ROCKS F sbu sandy SEDIMENTARY ROCKS orm rg er Lower atio Up Memb ? mber UPPER n per lomite me Dominant Lithology san nes Do CAMBRIAN Granite and (or) Gneiss dy m Mi Mi emb ? ? ddle er Sandstone ? do ? tone lo limes Marble mit 21,000 amed ? e m ? Unn ber em ? mem 4000 ber Sandstone, red TD 13,999 ? or Warri Elbrook Formation ? Shale, red ation Form e lomit ed do nnam ber ? Shale, dark gray and (or) black OTHER SYMBOLS U mem ? 5000 MIDDLE Contact — Queried where uncertain ? CAMBRIAN U ? ll Shale, gray and (or) green PP ? nt Hi ? ? ? Informal marker bed — Queried where uncertain M ER Pleasa ne ? ID C mesto ? DL AM Li ? E C B ? Waynesboro Formation ? Limestone Unconformity — Queried where uncertain ? A RIA MB N RI ? oro ? ? AN ? ynesb ? Datum — Base of micritic limestone at base of Black River Limestone in Ohio ? Wa tion LOWER Dolomite ? Forma Tomstown Dolomite and near middle part of Loysburg Formation in Pennsylvania ? ? CAMBRIAN ite ? s s s Elemental sulfur Cored interval in drill hole olom ? ? Basal sandstone unit ? town D ? ? ? Toms ? ? MIDDLE ? t Normal fault — Arrow on downthrown side ne uni Metabentonite andsto PROTEROZOIC ? Basal s Lithologic Modifiers Thrust faults of the Alleghanian orogeny — Postdate restored section C–C' ? ? ? ? (Used in conjunction with Dominant Lithology) ? ? AS Abbreviated name of drill hole ? ? SOUTH-CENTRAL PENNSYLVANIA ARCH Sandy F1 Macrofossil-bearing interval ? ? Silty F1—Wallace de Witt, Jr. (unpub. data, 1969) F —Reported by Knowles (1966) Argillaceous, gray and (or) green 2 ? F3—Reported by Thompson (1963) R R Argillaceous, red (red R shown where dominant lithology of R F4—Reported by Knowles (1966) gray and (or) green shale contains minor red shale beds) ? M F and F —Reported by Spelman (1966) L ID 5 6 ? O D W L Calcareous E E f Microfossil-bearing interval — See table 2 for description of identifiable R C 1 C A M conodonts L A REFERENCES CITED M O M B Dolomitic I B R D W R IA 0 GR 200 D E I Barnes, C.R., Norford, B.S., and Skevington, David, 1981, The Ordovician System in Canada, correlation L R A N Root, S.I., 1968, Geology and mineral resources of southeastern Franklin County, Pennsylvania: E C N P Anhydritic Gamma-ray curve.—Log scale generally from 0 to 200 API units chart and explanatory notes: International Union of Geological Sciences Publication 8, 27 p. R A Pennsylvania Topographic and Geologic Survey Atlas 119cd, 118 p., 1 map, scale 1:24,000.