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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 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 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 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 ? 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 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 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 TD 10,387 Anh s ? ? ? 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 ? 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 ? 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 ? ? 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 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. Tectonic provinces in Ohio, West Virginia, and Pennsylvania O M Berg, T.M., Edmunds, W.E., Geyer, A.R., Glover, A.D., Hoskins, D.M., MacLachlan, D.B., Root, S.I., Sevon, T B Ross, R.J., Jr., Alder, F.J., Amsden, T.W., Bergström, Douglas, Bergström, S.M., Carter, Claire, Churkin, (along section C-C') East of C-C' E R W.D., and Socolow, A.A., compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Topo- R IA Michael, Cressman, E.A., Derby, J.R., Dutro, J.T., Jr., Ethington, R.L., Finney, S.C., Fisher, D.W., Fisher, ) North American O 3 Carbaugh-Marsh Creek Cherty N l Allegheny 8 time-stratigraphic graphic and Geologic Survey Map 1, 3 sheets, scale 1:250,000. Z e l a J.H., Harris, A.G., Hintze, L.F., Ketner, K.B., Kolata, D.L., Landing, Ed, Newman, R.B., Sweet, W.C., m fault block and adjoining O 9

c units (modified a m e i 1 ) I m structural front North Mountain fault ? r Berg, T.M., McInerney, M.K., Way, J.H., and MacLachlan, D.B., 1983, Stratigraphic correlation chart of c Relatively Ohio-West e C Pojeta, John, Jr., Potter, A.W., Rader, E.K., Repetski, J.E., Shaver, R.H., Thompson, T.L., and Webers, h after Barnes and , a e t s r e t h Rome

block, southeastern t o others, 1981; e M Pennsylvania: Pennsylvania Topographic and Geologic Survey General Geology Report 75, 1 s and adjoining e

G.F., 1982, The Ordovician System in the United States: International Union of Geological m stable Virginia

Oolitic ( a n Franklin Co., Pa. y Ross and others, r m u

o trough l m

? S sheet. i (Root, 1968; Berg and Sciences Publication No. 12, 73 p. E 1982; Palmer,1983) Valley and Ridge N t a

E craton hinge zone ? others, 1983) Calvert, W.L.,1964, Cambrian erosional remnants yield oil in central Ohio: World Oil, v. 158, no. 4, p. 78, P Ryder, R.T., 1991, Stratigraphic framework of Cambrian and Ordovician rocks in the central ( Series Stage province

80, 82, 84. Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia: U.S. Geological ?

a Juniata Epstein, A.G., Epstein, J.B., and Harris, L.D., 1977, Conodont color alteration — An index to organic 438 Juniata Survey Miscellaneous Investigations Series Map I-2264. G Queenston Juniata

+ Formation n metamorphism: U.S. Geological Survey Professional Paper 995, 27 p. ------1992, Stratigraphic framework of Cambrian and Ordovician rocks in the central i Formation a i R Shale Formation

r Bald Eagle Formation Janssens, Adriaan, 1973, Stratigraphy of the Cambrian and Lower Ordovician rocks in Ohio: Ohio Appalachian basin from Morrow County, Ohio, to Pendleton County, West Virginia: U.S. t Bald Eagle Formation a e (Oswego Sandstone) n Division of Geological Survey Bulletin 64, 197 p. p

Geological Survey Bulletin 1839-G, p. G1-G25. M n i 80° 75° p 79° ------1977, Silurian rocks in the subsurface of northwestern Ohio: Ohio Division of Geological Ryder, R.T., Harris, A.G., and Repetski, J.E., 1992, Restored stratigraphic section C-C' from Medina c

76° U

77° 448 n

i Reedsville Reedsville Reedsville Reedsville 78° Survey Bulletin 100, 96 p. County, Ohio, through southwestern and south-central Pennsylvania, to Hampshire County,

81° C

NEW YORK E Kay, G.M., 1944a, Middle Ordovician of central Pennsylvania: Journal of Geology, v. 52, no. 1, p. 1-23. ? West Virginia, showing the Cambrian and Ordovician sequence: U.S. Geological Survey Bulletin Shale Shale Shale Shale ENNSYLVANIA 84° 83° 82° P ------1944b, Middle Ordovician of central Pennsylvania: Journal of Geology, v. 52, no. 2, p. 97-116. 1839-K, p. K1-K32. Martinsburg . p p FEET p Antes Shale

Knowles, R.R., 1966, Geology of a portion of the Everett 15-minute quadrangle, Bedford County, u Shumaker, R.C., Wilson, T.H., Dunne, W.M., Knotts, Joseph, and Buckley, Rex, 1985, Pennsylvania, Virginia, Utica Shale u ? G Antes Shale Antes Shale Formation n S

?

2000 o o r r n Pennsylvania: Pennsylvania Topographic and Geologic Survey Progress Report PR 170, 90 p. a i and West Virginia sections, ch. I of Woodward, N.B., ed., Valley and Range thrust belt: Balanced o

Coburn G t r A' Coburn G Coburn Limestone

k e Trenton Limestone n n Palmer, A.R., compiler, 1983, The Decade of North American Geology 1983 Geologic Time Scale: n Bentonite R t L METERS structural sections, Pennsylvania to Alabama: University of Tennessee Studies in Geology 12, e K w r Limestone o s Limestone o

t Bentonite No. 0 t

T marker h n marker of Stith (1979) marker ßmarker h a

o 500 n

Geology, v. 11, no. 9, p. 503-504. n c c p. 6-35. e l h a e o r r marker of Stith (1979) e i ß Salona Limestone ß marker r Salona Limestone h H r o

a R c C a Me Pepper, J.F., de Witt, Wallace, Jr., and Everhart, G.M., 1953, The "Clinton" sands of Early Silurian age in d T

T r W G Spelman, A.R., 1966, Stratigraphy of Lower Ordovician Nittany Dolomite in central Pennsylvania: c a i Nealmont Limestone Nealmont Limestone Chambersburg a d OHIO U M 1 i 41° i v

Canton, Dover, Massillon, and Navarre quadrangles, Ohio: U.S. Geological Survey Bulletin 1003-A, R y O Pennsylvania Topographic and Geologic Survey Bulletin G 47, 187 p. G ? a n Black River Black River Group ? l R Black River Group R LHL & SL, undivided o B

a B 41° d T 75° M Formation M 2 v 15 p. Stith, D.A., 1979, Chemical composition, stratigraphy, and depositional environments of the Black Loysburg Formation Hatter Limestone

d Limestone in E l Allegheny F M y r Loysburg Formation Clover Member Clover Member St. Paul Group Unnamed Ohio-West Virginia s C Perry, W.J. , Jr., 1964, Geology of the Ray Sponaugle well, Pendleton County, West Virginia: American River Group (Middle Ordovician), southwestern Ohio: Ohio Division of Geological Survey Report 3 O C Milroy Member Milroy Member

C O R n structural front 1000 R D arch hinge zone n Association of Petroleum Geologists Bulletin, v. 48, no. 5, p. 659-669. of Investigations 113, 36 p. Pinesburg Station

S W Bellefonte H e 250 p ------1972, The Trenton Group of Nittany anticlinorium, eastern West Virginia: West Virginia p Formation 40th parallel P Sweet, W.C., and Bergström, S.M., 1986, Conodonts and biostratigraphic correlation: Annual Review of u

H ? ? u l Wells Creek o r E 4 lineament G Geological and Economic Survey Circular 13, 30p. 478 o Pittsburgh a N Earth and Planetary Sciences, v. 14, p. 85-112. Dolomite r ? t O G ?

? ) n Bl Lat 40° N. R Formation G P Piotrowski, R.G., 1981, Geology and natural gas production of the Lower Silurian Medina Group and n Pan G Thompson, R.R., 1963, Lithostratigraphy of the Middle Ordovician Salona and Coburn Formations in a American e n fault zone IN w

c r ? C D w equivalent rock units in Pennsylvania: Pennsylvania Topographic and Geologic Survey Mineral o No. A ( 1 Win central Pennsylvania: Pennsylvania Topographic and Geologic Survey Bulletin G38, 154 p. t Rockdale dbig o le E r e Ha B R t h n n h t 6 40° Nittany n Resources Report 82, 21 p., 11 pls. Beekmantown Beekmantown a

6t F Wagner, W.R., 1966, Stratigraphy of the Cambrian to Middle Ordovician rocks of central and western w u a Run g a i 40° 5 76° 10 20 MILES m u o o

Phillips m Rones, Morris, 1969, A lithostratigraphic, petrographic and chemical investigation of the lower Middle k Dolomite o s 8t UGH-MARSH Pennsylvania: Pennsylvania Geological Survey Bulletin G49, 156 p. x Group Group 8 CARBA k e h Columbus r 7 L Formation e c t 0 Rose Run e No. A–1 FAULT e r EK THRUST Ordovician carbonate rocks in central Pennsylvania: Pennsylvania Topographic and Geologic RE b So 7t C e B a I N Finch B i 0 10 20 30 KILOMETERS Sandstone t Survey General Geology Report G53, 224 p. a D ? Larke Dolomite n Occidental N Stoufferstown Member W 505 - Member n A Blue Ridge i L a Mines Dolomite Member Mines Dolomite Member

No. 1 Burley Upper sandy p Shadygrove c Y n n e c R u a A n n Upper sandy o i

n Formation A structural front p member

i i

9 o o u t o M i member Upper sandy r C i o c t m a a e t

9t i

Knox a G z e a Hope Natural Gas e m

m Hm l member r C ' o r

m Middle o o m e r WEST T o z Dolomite r

No. 9634 W R r u N o dolomite o 85° 39° ? F

o Ore Hill

F g I VIRGINIA e n F Power Oil Co. of Janssens g 39° member a e a r r g S 77° n Limestone Member l i Hd g r

e Zullinger u r e

n (1973) a A u a h b Drill holes used in section C-C' u b Table 1. o s c

E p b B h Formation s c P B zone of Calvert (1964) e s o t p e Lower sandy n P

G e t c a P [Locations shown on figure 1] Krysik ss. of driller's usage t a a o a U r e D G member n

G G I F Conasauga Formation D' Identification Name used in text Permit Lithologic Cored intervals (ft) Total Age of oldest rocks o m Table 2. Conodonts from the Amoco No. 1 Svetz drill hole, Somerset County, Pa. R n o 1 C . a no. (abbreviation) Location no. log and formation depth (ft) penetrated (formation) i Rome Formation d Harrisonburg

m C O U N T I E S [100- to 200-g cuttings taken at 100-ft intervals between 15,000 and 21,000 ft were processed for conodonts; only the productive samples are listed. Well h Unnamed ls. mbr. F n KE Charleston E' c of Janssens (1973) NTUCKY 1 ………….. Wiser Oil No. 1–A Hinckley Township, 1143 GSLC, J 5,700–5,714; Black River 7,040 Middle Proterozoic. r o N a 86° I OHIO collar at 2,480-ft elevation; total depth 21,460 ft. Conodont color alteration index (CAI) is a measure of organic maturation (Epstein and others, 1977)] o b t Mount Simon i A Smith (WS). Medina County, Ohio. Limestone. r Unnamed 38° s g T T r 38° r N L C Columbiana e Sandstone n r i U U 5,742–5,746; Wells Creek a dolomite O A 78° Ha Harrison 523 D x M F W e T Sample USGS member H S M Medina Formation. Elbrook L N T U R R N Noble Pleasant Hill A O H 5,759–5,890; Wells Creek interval (ft) collection no. Conodonts Age CAI n Formation I LT N T T Limestone H Mn U L S Stark a C FA U Formation, Knox Dolo- i ? ? ST FA Coburn Limestone r A U T e l L HR US 79° WEST VIRGINIA mite of Janssens (1973). 15,400–15,500….. 10750–CO 1 P (dichognathiform) element of Phragmodus Middle Ordovician, no older than early 5 b A T R d P IR H m LA T H Hancock 7,028–7,040; basement d P i . C E sp. indet. or Plectodina sp. indet. Chazyan [no older than Phragmodus a A ST G E Hd Hardy rocks of Middle Protero- D C RI tangshanensis Zone (= P . pre- M 37° E L U Hm Hampshire AIN LU 37° Mingo zoic age. NT B B Mn flexuosus Zone of Sweet and Berg- ? ? OU T Pendleton 2 ………….. Belden and Blake and Company Marlboro Township, 1080 GSLC, J 7,961 Late Cambrian (Rome Forma- Cum M UL P berland saddle NE FA strÖm (1986)] PI ST W Wood No. 9 Limited Partnership Stark County, Ohio. tion of Janssens, 1973). RU Waynesboro TH Trenton Group VIRGINIA PENNSYLVANIA No. 1–381 Westfall (BBW). 540 Formation Waynesboro TENNESSEE NORTH CAROLINA 3 ………….. Management Control Hanover Township, 648 GSLC, J 10,242 Middle Proterozoic(?). 15,700–15,800….. 10751–CO 1 P (dichognathiform) element of Phragmodus do. 5 81° B Bedford Formation e X Thorn Hill Bl Blair No. 3 Murray (MM). Columbiana County, Ohio. sp. indet. or Plectodina sp. indet. m RLAND outc ? o CUMBE rop C Centre 4 ………….. Humble No. 1 Clay District, Hancock 80 GSLC 10,387 Late Ordovician (part of Beek- d TEAU sectio 1 M element, unassigned. e PLA n F Franklin 36° ill Minesinger (HM). County, W. Va. mantown Group). r

T H Huntingdon Trenton and Black River Groups e v THRUS 36° Tomstown h LT 5 ………….. Amoco No. 1 Svetz (AS) Middle Creek Township, 45 GSLC 21,460 Late Cambrian s FAU 82° L Lycoming w Formation a 15,800–15,900….. 10752–CO 1 P (dichognathiform) element of Phragmodus do. 5 . o N Y Me Mercer Somerset County, Pa. (Gatesburg Formation). p E G L L A 0 25 50 75 100 MILES So sp. indet. or Plectodina sp. indet. L Somerset e G 83° 6 ………….. Kerr-McGee No. 1 Napier Township, 34 GSLC 11,850 Late Cambrian A T e V T O L L 0 50 100 150 KILOMETERS w Loysburg Formation o IE U O U Schellsburg (KMS). Bedford County, Pa. (Gatesburg Formation). A MARYLAND h A N l

H i F A F C h T T T T W Washington 16,500–16,600….. 10753–CO 1 M element, unassigned. do. 5

7 ………….. Kerr-McGee No. 1 Harrison Township, 13 GSLC, W 3,000–3,027; Beekman- 6,676 Early and Middle Ordovician C A S T S U U A U ? ? ? Q R H R Martin (KMM). Bedford County, Pa. town Group. (Beekmantown Group) 1 indeterminate fragment. E H C H 570 S T 35° T 5,002–5,025; Beekman- thrust over Early Middle 16,600–16,700….. 10754–CO 1 robust hyaline ramiform fragment. do. 5 Catoctin Formation 35°

86° e

16,900–17,000….. 10755–CO do. do. 5 t 85° 84° town Group. and Late Ordovician (Beek- c i

EXPLANATION a o

6,671–6,676; Juniata For- mantown Group, Reedsville Beekmantown Group L z

Axis of arch 17,000–17,100….. 10756–CO 1 Pb element of Curtognathus sp. indet. do. 5 o

mation. Shale, Bald Eagle Forma- 900 r e e l Structural front tion, and Juniata Forma- 17,100–17,200….. 10757–CO 1 Pb element of Curtognathus sp. indet. do. 5 t d Present location of drill hole used to construct sections o

Thrust fault—Sawteeth on upper plate r 4 1 robust hyaline ramiform fragment. d E–E' (Ryder, 1992), D–D' (Ryder, 1991), C–C' (Ryder and tion). i Metamorphic and igneous rocks of Normal fault—Bar and ball on relative downthrown side P others, 1992), and A–A' (R.T. Ryder, unpub. data). 8 ………….. Arco No. 1 Steele (ARS) Snake Spring Township, 009–20060 GSLC 15,500 Early(?) and Middle Cambrian 17,700–17,800….. 10758–CO 1 indeterminate fragment. do. 5 M Grenville orogenic belt Transverse fault Number, where shown, refers to drill hole as described in table 1 Bedford County, Pa. (Waynesboro Formation) 17,800–17,900….. 10759–CO 1 M element of Phragmodus sp. indet. Middle Ordovician, interval of P. 5 Proterozoic basement rocks at surface thrust over Middle and Late Location of drill hole restored along the dashed line to 1 fragment of Multioistodus ? sp. tangshanensis Zone–Cahabagnathus EXPLANATION Line of section (R.T. Ryder, unpub. data) 9t A–A' approximately original position prior to westward tectonic Cambrian and Early and 7 indeterminate fragments. friendsvillensis Zone. C–C' Line of section (Ryder and others, 1992) transport. These projected positions are shown in early Middle Ordovician Metabentonite Hiatus sections C–C', D–D', and E–E'. Number, where shown, refers 18,000–18,100….. 10759–CO 1 indeterminate fragment. do. 5 D–D' Line of section (Ryder, 1991) (Warrior Formation, Gates- to drill hole as described in table 1. 18,100–18,200….. 10760–CO 1 P (dichognathiform) element of Phragmodus do. 5 E–E' Line of section (Ryder, 1992) burg Formation, and Beek- Figure 2.—Correlation chart of Middle Proterozoic, Cambrian, and Ordovician rocks along mantown Group). sp. indet. section C-C' and in the adjoining Franklin County, Pa. Absolute age (in Ma) is taken from the geologic time scale compiled by Palmer (1983). The time scale is nonlinear. North Figure 1. Tectonics of Ohio, Pennsylvania, West Virginia, and adjoining States showing the Appalachian basin, section 9 ………….. Shell Oil No. 1 Springfield District, 12 GSLC, W 10,522–10,528; 13,999 Middle and Late Cambrian 18,200–18,300….. 10760–CO 2 indeterminate fragments. do. 5 C–C', selected drill holes, and selected counties. Lines of sections E–E' and D–D' (Ryder, 1992, 1991) and A–A' (R.T. Ryder, Duckworth (SD). Hampshire County, Beekmantown Group. (Elbrook Formation). 18,400–18,500….. 10760–CO 1 indeterminate hyaline fragment. do. 5 American chronostratigraphic units are modified after Barnes and others (1981), Ross and unpub. data) are also identified on the map. Base from Wallace and de Witt (1975). Major tectonic and geologic features others (1982), and Palmer (1983). Series and Stage names: BR, Blackriveran; Ca, Canadian; are from Cooper (1945), Calver and Hobbs (1963), Swingle and others (1966), Rodgers (1970), Wallace and de Witt (1975), W. Va. 13,958–13,999; 19,900–20,000….. 10760–CO 1 poorly preserved panderodontacean? ele- Middle(?) Ordovician, probably down- 5 C, Chazyan; E, Edenian; Ga, Gamachian; K, Kirkfieldian; M, Maysvillian; R, Rocklandian; Ri, Root and Hoskins (1977), Berg and others (1980), Shumaker and others (1985), and Coogan and Maki (1988a). Recent Elbrook Formation ment. hole contamination. studies (for example, Wickstrom, 1990) indicate that the structure of the Cincinnati and Findlay arches is more complex Richmondian; S, Shermanian; WR, Whiterockian. Group name: BRG, Black River Group. than shown in this figure and by Wallace and de Witt (1975). Numbered drill holes in section C–C' are identified in table 1. 1Lithologic logs from Geological Sample Log Company (GSLC) Pittsburgh, Pa., Janssens (1973) (J), and Wagner (1966) (W). 1 hyaline coniform fragment. Formation names: LF, Loysburg Formation; LHL, Linden Hall Limestone; SL, Snyder Limestone.

RESTORED STRATIGRAPHIC SECTION C-C' FROM MEDINA COUNTY, OHIO, THROUGH SOUTHWESTERN AND SOUTH-CENTRAL PENNSYLVANIA TO HAMPSHIRE COUNTY, WEST VIRGINIA, SHOWING THE CAMBRIAN AND ORDOVICIAN SEQUENCE By Robert T. Ryder, Anita G. Harris, and John E. Repetski 1992

Revised and Digitized By Robert D. Crangle, Jr. 2002