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Stratigraphic Framework of Cambrian and Ordovician

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U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATIONS SERIES MAP I-2200 WOOSTER ARCH UNNAMED HINGE ZONE SE NORTHEASTERN END OF ROME TROUGH (MAIN BRANCH) ROME TROUGH (MINOR BRANCH) ALLEGHENY STRUCTURAL B' OHIO-WEST VIRGINIA HINGE ZONE 9t 11t FRONT Shell Oil Company California Company 10t No. 1 Snyder No. 1 Shade Mountain NW Deep Rock Oil Corporation Juniata Co., Pa. 8 Lycoming Co., Pa. No. A-1 Walizer B Texaco Incorporated and Marathon Oil Company No. 1 (Restored about 40 mi (64 km) southeastward to prethrusting A-A' Clinton Co., Pa. position using section C-C' from Berg and others (1980); bed Pennsylvania State Forest Tract 285 Composite outcrop section above drill hole Thrust faults showing about from Rones (1969) and Faill and Wells (1977) Composite outcrop section above drill hole thicknesses corrected for 45˚ dip above 4540 ft; gamma-ray Clinton Co., Pa 8 mi (12.9 km) shortening log above 4540 ft has not been corrected for dip) (Restored about 10 mi (16 km) southeastward from Thompson (1963), Rones (1969), Faill (Berg and others, 1980) Tie with to prethrusting position using section from Faill and Wells (1977), and Cotter (1982) Thrust faults showing about and Wells (1977); dip approximately horizontal, (Restored about 19 mi (30.6 km) southeast- LOWER (R.T. Ryder, unpub. data) unpub. Ryder, (R.T. FEET 8.5 mi (13.7 km) shortening thus, bed thickness correction unnecessary) ward to prethrusting position using section SILURIAN 7 10,000 from Faill and Wells (1977); bed thicknesses 1 (Faill and Wells, 1977) 2 4 Consolidated Gas Supply Corporation No. N-972 not corrected for dip) Calhio Chemicals Incorporated Pennsylvania Department of Forest and Water Tract 129 Quaker State Oil and Refining Corporation Benedum and Arkansas-Louisiana Gas Company 5 6 No. 1 Calhio Chemicals Incorporated No. 1 Kemmer Biery and Johnson Company Potter Co., Pa. Thrust faults showing about Tuscarora R Lake Co., Ohio No. 1 Kardosh Minard Run Oil Company Ashtabula Co., Ohio Crawford Co., Pa. No. 1 Shaw 18 mi (29 km) shortening Sandstone No. 1 Minard Run FEET (Faill and Wells, 1977) FEET Warren Co., Pa. McKean Co., Pa. 10,000 1000 R Tusc R arora Sandstone andstone Composite outcrop section R ? 11,000 Tuscarora S above drill hole from Conlin R R ? R R and Hoskins (1962) and FEET FEET FEET R Horowitz (1965) 2000 R 3000 5000 FEET 6000 Juniata Juniata R Juniata R ? R Formation R R ? 2000 R R 11,000 Formation R R Formation ? R R R R Reynales Dolomite of Piotrowski (1981) R R R UPPER OHIO 12,000 R R r 7 R R Lost Run Membe ORDOVICIAN and Berg and others (1983) Tuscarora Sandstone R kins (1962) Clinton Group R R R of Conlin and Hos 3000 6000 Packer shell of Pepper PENNSYLVANIA 4000 Medina Group R R ? Bald Eagle LOWER R R ? Bald Eagle and others (1953) 7 7000 Bald Eagle Formation Formation FEET SILURIAN Cabot Head Shale Whirlpool Sandstone R Formation 0 "Clinton" sandstone and shale of Janssens (1977) Grimsby Sandstone R 12,000 3000 Medina Group Juniata Formation R R ? Queenston R 13,000 ? Shale R R unnamed siltstone R R R R Reedsville Shale Reedsville and limestone 4000 5000 7000 R Shale 1000 UPPER R Bald Eagle Formation 8000 2000 ORDOVICIAN Reedsville Shale 13,000 3000 4000 Reedsville ? Shale Reedsville Shale 1 1 14,000 Antes Shale Antes Shale Antes Shale1 Trenton Group Trenton Group ? 4 of Kay (1944a, b)4 3 of Kay (1944a, b) 5000 Utica Shale Utica Shale3 8000 1 Trenton Group Coburn Limestone B 6000 3 Antes Shale B )4 bentonite R ofB T B Coburn Limestone 4000 B B B B B B B Trenton Utica Shale Antes Shale1 1 Trenton Group 9000 B B B B B of Kay (1944a, b hompson (1963)B B B MIDDLE B Antes Shale B B B B Coburn, Salona, and Nealmont B B B B B B B B B B B B B B B B B B B B B B B B B Salona Limestone B Limestone B B B B B B B Limestones, undivided B B B B F1 B ORDOVICIAN Trenton Limestone B B B B B B B B BBB B B Salona Limestone Coburn and Salona 14,000 B B B B Nealmont Limestone B Salona B 5000 B B B B B B B B B B Limestone Black River Limestone ß marker of Stith (1979) Limestones, undivided Linden Hall Limestone b Black River Group Black River Group marker of ? ? ? Black River Group entonite No. ß Stith (1979) ? Snyder Limestone of T 0 Nealmont Limestone 15,000 hompson (1963) F DATUM Wells Creek Formation Gull River Formation Black River Group Black River Group ? 2 Linden Hall Knox Dolomite Hatter Limestone Limestone Rose Run Loysburg ? Snyder Limestone 5000 Sandstone Member 6000 B Shadow Lake Formation DATUM Loysburg Hatter Limestone UPPER zone of Calvert (1964 7000 upper sandy member Loysburg Formation 9000 Formation ? ? Loysburg ? ) Gatesburg Formation Loysburg Formation 10,000 Formation CAMBRIAN middle dolomite member of Wagner (1966) Knox unconformity DATUM Krysik sandstone Beekmantown Group ? FEET Formation of driller's usage Rome Formation ? ? 0 6000 of Janssens (1973) ? ? 15,000 FEET MIDDLE Mount Simon S TD 6440 Warrior Formation of Wagner (1966) ? TD 9398 ? andstone ? ? ? 0 ORDOVICIAN TD 6076 lower sandy member of Wagner (1966) MIDDL Bellefonte MIDDLE ? ? ? Beekmantown 16,000 E ORDOVICIAN TD = Total Depth. Potsdam Sandstone6 ? Gatesburg LOWER ? Dolomite PROTEROZOIC TD 6670 ? ? Formation Group ORDO ? uppe VICIAN ? 6000 3 8000 ? r sand ? y mem Projected from U.S. Gas and Oil Company TD 8031 ? 11,000 ber Beekmantown No. 1 Roulston ? ? middle dolo Group ? mite Ashtabula Co., Ohio member 16,000 1000 ? ? Warrior For 7000 mation lower sandy memb ? 1000 ? ? of Wagner (1966) ? 1 er upper 17,000 The Antes Shale was originally named in central Pennsylvania by Kay (1944a,b) and assigned a ? Potsdam B G sandy ? Sandstone B atesburg Fo membe Axemann Middle Ordovician age. Conodont studies by Valek (1982) and Sweet (1984) support a Middle r Limestone Ordovician (late Shermanian) age for the Antes Shale throughout most of Pennsylvania. However, ? B rmation ? TD 11,878 B middle d along the Rome trough segment of section C-C' (Ryder and others, 1992) (fig. 1), the Antes Shale B olo B me mite ? ? thickens at the expense of the overlying Reedsville Shale and very likely contains rocks of early B mber Beekmantown SEDIMENTARY ROCKS EXPLANATION ? B 2000 Group Edenian age. Therefore, the Antes Shale is generally late Shermanian in age, as suggested in cross B 17,000 section B-B', but, locally, may be as young as early Edenian. The early Edenian age previously Dominant Lithology B ? Nittany 8000 B ? Dolo 2000 assigned to the entire Antes Shale by Sweet and Bergström (1976) in central Pennsylvania and by lo mite wer sandy B ? 18,000 Ryder (1991, 1992) in northern West Virginia is considered here to be invalid. ? mem B ? Sandstone Anhydritic ber B Lark 2 DISCUSSION B e D The Reedsville Shale is extended into the subsurface of Ohio by Calvert (1963, 1964), Ryder (1991, B Gate olo B sb mite 1992), and Ryder and others (1992). B For urg INTRODUCTION W mation Mines Sandstone, red Oolitic arrio Dolo LOWER r For Me mite 3 ? m 18,000 unnamed mbe 3000 The Utica Shale is extended into the subsurface of Ohio by Fettke (1960), Calvert (1963, 1964), and ation shale r ORDOVICIAN Cross section B-B' is the fourth in a series of restored stratigraphic cross sections drawn by the Kane arch (defined by Kane gravity B member upp 9000 Ryder (1991, 1992) and into the subsurface of northwestern Pennsylvania by Berg and others (1983). Cherty er 3000 These authors assigned a Late Ordovician age to the Utica Shale. As discussed in Ryder and others Siltstone author to show the stratigraphic framework of Cambrian and Ordovician rocks in the Appalachian high of Diment and others, 1980, m sandy B 19,000 embe (1992) and shown by the thickening of the Utica Shale at the expense of the overlying Reedsville basin from Pennsylvania to Tennessee. In addition to providing stratigraphic and lithologic details of and Parrish and Lavin, 1982) Potsdam unnamed dolomitic r SandstoneB sandstone Shale in drill hole no. 4 in this study, the age of the Utica Shale in northeastern Ohio and Conglomeratic Cambrian and Ordovician strata, these cross sections also help to define and delineate the structure member Siltstone, red 6 northwestern Pennsylvania should be revised to Middle and Late Ordovician (late Shermanian and of the block-faulted Proterozoic basement rocks beneath the Appalachian basin. Previously ? B Mines Dolomite early Edenian). ? ? TD 19,360 completed cross sections in this series are cross section E-E' (Ryder, 1992), cross section D-D' (Ryder, Ore Hill Gatesb Member Shale, red ? unna Mem Form urg 4 1991), and cross section C-C' (Ryder and others, 1992) (fig. 1). ? 4000 ber (?) ati The Trenton Group of Kay (1944a,b) shown here differs slightly from Kay's original definition. The TD 18,834 med limestone on upp ? IGNEOUS AND METAMORPHIC ROCKS Section B-B' is about 290 mi (467 km) long. This section is constructed on the basis of eleven drill low er sandy 10,000 difference results because I follow Rones (1969) who moved the base of the Trenton Group of Kay ? er member holes that are from 13 to 52 mi (21-84 km) apart and range in depth from 6,076 to 19,360 ft (1,852- W sandy 4000 TD 10,036 (1944a, b), and the associated widespread unconformity, about 30 to 60 ft (9-18 m) upsection from Shale, dark gray and (or) black Fo arrior unna 5,901 m) (fig.
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  • Paleomagnetism of the Upper Ordovician Juniata Formation of the Central Appalachians Revisited Again

    Paleomagnetism of the Upper Ordovician Juniata Formation of the Central Appalachians Revisited Again

    JOURNALOF GEOPHYSICALRESEARCH, VOL. 94, NO. B2, PAGES1843-1849, FEBRUARY10, 1989 PALEOMAGNETISM OF THE UPPER ORDOVICIAN JUNIATA FORMATION OF THE CENTRAL APPALACHIANS REVISITED AGAIN JohnD. Miller1 andDennis V. Kent Lamont-DohertyGeological Observatol 3, and Department of GeologicalSciences, ColumbiaUniversity, Palisades, New York Abstract.Two componentsof magnetizationwere isolated demagnetizationin thestudy of red beds.During this time in theUpper Ordovician Juniata Formation sampled in the area periodall of themajor Appalachian red beds were studied or of the Pennsylvaniasalient. The thermallydistributed, restudiedusing modem paleomagnetic techniques. The revised reversedpolarity B componentwas most likely acquired resultsfrom the Juniatawere reported by Van der Voo and duringAlleghenian deformation, and although it is poorly French[ 1977], andwere incorporatedinto the analysisof grouped,it is similarto otherAppalachian synfolding Schwartzand Van der Voo [ 1983], which concludedthat there magnetizations.The pre-Alleghenianage C magnetizationis was no oroclinal rotation involved in the formation of the entirelyof normalpolarity and showsa differencein Pennsylvaniasalient, a majorstructural feature of thecentral declinationsbetween the meanmagnetizations isolated on the Appalachians. northern and southern limbs of the salient of 24 ø _+23 ø. This Recentcontroversy regarding the Paleozoic reference poles anomalyis consistentwith the senseand magnitude of for North Americaand their tectonic implications [Kent and declinationanomalies observed