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Geologic Map of the Osage SW 7.5ʹ Quadrangle, Newton, Madison, And

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Geologic Map of the Osage SW 7.5ʹ Quadrangle, Newton, Madison, And U.S. Department of the Interior Scientific Investigations Map 3416 U.S. Geological Survey Prepared in cooperation with the National Park Service A B hc however, where overlain by Pitkin Limestone, Fayetteville Shale varies in thickness from 1550 Mbv CORRELATION OF MAP UNITS Cane Hill Member—Interbedded sequence of shale, siltstone, and REFERENCES CITED Mb 4 6 4 1605 1900 Mf sandstone. Upper part composed of fissile to ripple-laminated, dark-gray METERS FEET 170 ft in the southwest to about 60 ft in the northwest. Thinning of the Fayetteville Shale 1970 1950 Angelier, J., 1990, Inversion of field data in fault tectonics to obtain the regional stress, 3 1,500 in the northwest part of the map could be explained by either a local erosional event that 1550 shale and siltstone underlain by 15- to 30-ft-thick middle interval of EXPLANATION Provincial Series 4 Qto Qty PERIOD EPOCH III, A new rapid direct inversion method by analytical means: Geophysical Journal 7 occurred prior to deposition of the Pitkin Limestone, or, alternatively, significantly less 4 Qc QUATERNARY ripple-laminated to thin-bedded, very fine grained sandstone; middle International, v. 103, p. 363–376. 3 Qto Sandstone 1570 2 interval also may contain channels of massive cross-bedded, fine- to Atoka accumulation of the shale in the northwest part of the map. Hudson and Turner (2014b) hc bu 2 1960 3 1850 Qty 1610 3 1,400 report variations in Upper Mississippian strata in the Buffalo River area, which they Craig, W.W., 1975, Stratigraphy and conodont faunas of the Cason Shale and Kimmswick 3 1910 medium-grained sandstone that locally has shale and siltstone ripup Formation Cross-bedded sandstone 2 Unconformity Middle and Fernvale Limestones of northern Arkansas, in Wise, O.A., and Hendricks, K., 1550 3 A Atokan (a) 1600 hc 1950 clasts and wood casts (fig. 3 ). Lower part of unit includes gray shale Ripple-bedded sandstone suggest could be related to tectonism. 6 Pennsylvanian bl hg a eds., Contributions to the Geology of the Ozarks, v. 2: Arkansas Geological Qty Atokan Middle Pennsylvanain and siltstone underlain by a 5- to 15-ft-thick, pale-orange, very fine to Mf Mf 6 400 Calcareous sandstone Regression of the sea in Late Mississippian resulted in a major unconformity eroded Commission, p. 61–95. Mp 1925 1925 2 fine- grained, calcite-cemented sandstone that is often punky and friable 1,300 3 bu bu Dolomitic sandstone into Upper Mississippian strata (Sutherland, 1988; Manger and Sutherland, 1992). This 1565 1590 due to partial leaching of calcite. Sandstone at base of unit locally Craig, W.W., Wise, O.A., and McFarland, J.D., III, 1984, Stratigraphy and depositional Mbv Mf 3 1550 1615 1600 1910 3 period of erosion is supported by the pinchout of the Pitkin Limestone, thinning of the 5 Unconformity overlies conglomerate lenses as thick as 3 ft that contain quartz pebbles Limestone environments of Silurian strata, north central Arkansas, in Craig, W.W., Wise, O.A., 5 Upper Fayetteville Shale, and the presence of Archimedes-bearing Pitkin Limestone clasts in Mb 2 and subangular to subrounded clasts of sandstone, siltstone, shale, and 1,200 Dolostone and McFarland, J.D., III, eds., A guidebook to the post-St. Peter Ordovician and the Mf 1900 1900 part 1900 bu bl PENNSYLVANIAN basal conglomerate lenses of the Cane Hill Member of the Lower Pennsylvanian Hale 2 3 limestone. Sandstone beds throughout unit locally display slumps and Silurian and Devonian rocks of north-central Arkansas: Arkansas Geological 1925 Morrowan Lower Pennsylvanian (bu) Shale Formation (hc), which were deposited above the unconformity (for example, Purdue 3 1580 7 1600 PICKLE 1600 hg folds attributed to soft-sediment deformation. Unit unconformably Commission Guidebook GB–84–1, p. 14–19. 1540 1565 7 4 1900 Siltstone and shale and Miser, 1916; Hudson and Turner, 2016). 1845 5 1,100 1900 overlies Pitkin Limestone (Mp) and Fayetteville Shale (Mf). Thickness is Bloyd Formation 2 1545 3 1890 2 Unconformity Frezon, S.E., and Glick, E.E., 1959, Pre-Atoka rocks of northern Arkansas, chap. H of 4 3 Mbv Mf 1890 "Middle Bloyd sandstone" Chert 1560 100–180 ft Sandstone and siltstone channels of the Cane Hill Member (hc) vary laterally and 2 1575 1600 3 (not mapped separately) Shorter contributions to general geology: U.S. Geological Survey Professional Paper 3 1890 hc Mp Phosphate nodules stratigraphically and are interpreted as tidally influenced successions with lenses of 1550 3 HOLLOW 1550 Pitkin Limestone (Upper Mississippian, Chesterian)—Medium- to Lower 314, p. 171–189, 12 pl. [Also available at bu 12 FAULT 4 9 part 7 6 5 1,000 (bl) Oolites storm-deposited calcareous sandstones (Manger and Sutherland, 1992). Following a 1540 Morrowan 8 1595 3 1870 1710 Unconformity dark-gray fetid limestone. Limestone varies from micrite at base to 300 Brentwood Limestone Member https://pubs.er.usgs.gov/publication/pp314H.] 7 2 period of erosion, alternating thick sand-rich bioclastic facies and thin shales of the 1850 2 Prairie (not mapped separately) Unconformity 1600 1730 coarse grained and locally oolitic near top. Limestone beds locally Grove in 2 1450 4 hg Glick, E.E., 1979, Arkansas, Craig, L.C., and Conner, C.C., eds, Paleotectonic 2 1575 1510 5 Mp Archimedes Lower Pennsylvanian Member Prairie Grove Member of the Hale Formation ( ) represent deposition in a shelf 4 3 6 6 4 4 contain abundant crinoids, brachipods, corals, and bryzoan Bryozoans bl 2 2 (hg) environment in a series of rapidly alternating transgressive pulses (Sutherland, 1988). investigations of the Mississippian System in the United States, Part 1: U.S. 1760 1880 (fig. 3B). Basal contact with the Fayetteville Shale (Mf) is conformable. 900 1550 hg 4 4 bl Mf Chesterian Upper Mississippian Geological Survey Professional Paper 1010, p. 125–145. [Also available at 4 8 Pitkin generally crops out as a prominent ledge or cliff. Only present in The Brentwood Limestone Member of the Bloyd Formation, included here in what 1750 Mbv https://pubs.er.usgs.gov/publication/pp1010.] 2 1500 1850 the southwest and northwest parts of the map area. Thickness 0–40 ft Cane Hill we refer to as the lower part of the Bloyd Formation (bl), is gradational with the 1580 bl 7 Member 1530 800 Hale Formation 3 4 (hc) Handford, C.R., 1986, Facies and bedding sequences in shelf-storm-deposited 3 Unconformity MISSISSIPPIAN Mf Fayetteville Shale (Upper Mississippian, Chesterian)—Black shale with underlying Prairie Grove Member of the Hale Formation. The presence of limestone 3 1570 4 carbonates—Fayetteville Shale and Pitkin Limestone (Mississippian), Arkansas: Mf 1900 2 1850 a conglomerate with sandstone and siltstone clasts and fossil fragments indicates a high- 3 1800 1830 1850 interbeds of dark-gray to tan sandstone. Upper part of unit is usually 1850 1820 3 1550 Middle Mississippian Journal of Sedimentary Petrology, v. 56, p. 123–137. Mb Meramecian- energy marine environment during deposition of part of the lower part of the Bloyd 3 absent, but where present in southwestern part of map, includes a tan, Pitkin Mp 3 Osagean 700 Limestone ( ) 5 1550 calcite-cemented sandstone as thick as 12 ft, representing the Wedington Mp Formation. Sandstone and shale of the upper part of the Bloyd Formation were originally Handford, C.R., 1995, Baselap patterns and the recognition of lowstand exposure and 1550 Osagean- Mbs Lower Mississippian 200 Wedington Sandstone Member called Winslow Formation by Purdue and Miser (1916), and the prominent cliff-forming drowning—A Mississippian-ramp example and its seismic signature: Journal of 5 7 3 Kinderhookian Sandstone Member (Purdue and Miser, 1916). Sandstone is very fine 1565 hc (not mapped separately) 2 1580 1930 1850 Fayetteville cross-bedded sandstone was correlated with the basal Greenland Sandstone Member of Sedimentary Research, v. B65, p. 323–337. Mbv 5 1580 grained, and medium to thin, planar to ripple bedded with internal 2 Unconformity 600 Shale 4 parallel laminations. Main body of unit is black, fissile shale that the Atoka Formation (Henbest, 1953). However, Zachry (1977) concluded that the Heckel, P.H., and Clayton, G., 2006, The Carboniferous System—Use of the new official 10 1920 (Mf) 4 Of generally forms gentle slopes. Lower part of the Fayetteville may contain Chesterian cliff-forming sandstone was a time-equivalent unit with the Woolsey Member of the names for the subsystems, series, and stages: Geologica Acta, v. 4, no. 3, 14 1600 Upper Ordovician 3 1905 Mb medium- to light-gray, fetid septarian concretions as large as 2 ft in Bloyd Formation, farther west. The sandstone, informally designated the “middle Bloyd p. 403–407. 2 3 7 500 Upper Mississippian Batesville 1540 2 1900 1645 4 1900 Unconformity bu 1880 1855 diameter. Fayetteville Shale is susceptible to landslides. Unit is Ss (Mbv) Hindsville Limestone Member sandstone,” is interpreted as a braided river deposit (Zachry, 1977). The “middle Bloyd 2 4 1900 1920 2 (not mapped separately) Henbest, L.G., 1953, Morrow Group and lower Atoka Formation of Arkansas: American 2 1660 4 3 1950 Oeu Middle Ordovician conformable with underlying Batesville Sandstone. Where overlain by sandstone” is the basal interval of the upper part of the Bloyd Formation map unit (bu) 3 4 1650 1910 ORDOVICIAN Association of Petroleum Geologists Bulletin, v. 37, p. 1935–1953. 5 Pitkin Limestone, Fayetteville Shale is as thin as 60 ft in the northwest as used here. Overlying the “middle Bloyd sandstone,” the unit consists of siltstone and 3 400 3 1630 1920 3 Unconformity Horner, G.J., and Craig, W.W., 1984, The Sylamore Sandstone of north-central Arkansas, 1930 3 5 1600 part of the map but as thick as 170 ft in the southwest part of the map Meramecian shale mixed with fine to coarse sandstones that record deposition in a marine 3 1900 3 5 1590 Middle in Mbv 1920 1630 6 with emphasis on the origin of its phosphate, McFarland, J.D., III, ed., Mf 2 2000 Ou Lower Ordovician Mbv environment consistent with correlative deposits of the Dye Shale Member farther to the 1610 Batesville Sandstone (Upper Mississippian, Chesterian)—Very fine to Boone Mississippian 100 Mississippian Pennsylvanian (part) 4 2 2 west (Zarchary, 1977).
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