By William E. Edmunds, Jane R. Eggleston(auth.)
About The Product
Published by means of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
within the northern Appalachians, the boundary among the Mississippian and Pennsylvanian structures falls inside a fancy sedimentary series unfold throughout a rapidly-subsiding depositional trough and an adjoining, extra reliable craton margin. Sediment resource parts lie in a more-or-less non-stop semicircle from southeast to north of the basin. moreover, the higher Mississippian-Lower Pennsylvanian series is interrupted by means of vast erosion relating to epeirogenic upwarping of the area. Biostratigraphically, the systemic boundary is put on the first prevalence of the floral shape Neuropteris pocahontas (D. White) of floral area four as outlined by means of learn and Mamay (1964). although, as a result of the common disconformable nature of the touch, the basal Pennsylvanian plant life is frequently more youthful.
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Additional info for Characteristics of the Mid-Carboniferous Boundary and Associated Coal-Bearing Rocks in the Appalachian Basin: Morgantown, West Virginia to Chattanooga, Tennessee, July 19-27, 1989
The depositional environment of strata near the boundary is equally controversial. For example, widespread deposits of orthoquartzite or quartz arenite have been interpreted as offshore bars, tidal channels, and barri e-r-:-bars of a mari ne envi ronment by Englund and Delaney (1966), Englund (1972), Ferm (1974b), Miller (1974), and Cecil and Englund (1985) or as distributary channels, braided streams, or delta lobes of a terrestrial environment (Donaldson and Shumaker, 1979; Houseknecht, 1980).
Bode (1958), Bouroz and others (1978) and Wagner (1982a) all look upon this break as a useful stratigraphic marker throughout the paleoequatorial belt of Carboniferous strata. In northwestern Georgia, compressionimpression floras have been collected at 35 localities from Pennsylvanian strata and at 3 localities from the Upper Mississippian Pennington Formation (Gillespie and Crawford, 1985). The systemic boundary between the Mississippian and Pennsylvanian Systems in Georgia has been placed, in the absence of biostratigraphic data, at the contact between the Pennington Formation and the Raccoon Mountain Member of the Gizzard Formation (Thomas and Cramer, 1979).
Green SHALE, v. dk. ,...... , 'l:t • ' • • co . SANDSTONE, fine grained. ,..... gray o DISCONFORMITY ~ SHALE. reddish ~ brown. -........ '• ';' : :. to fine grained. It. ' • , •• , . ' 1) dd ' ~75 ,. '" •• , SANDSTONE. : ;. gray :::c o J: o::> « # ~ , ' ~90--~~-"'" SHALE. very dk gray . iiiiiii..... COAL ~ CLAYSTONE. ' .. ~'". '.. ' ... edded CALCAREOUS 'SANDSTONE, white, x-bedded & SHALE} reddish brown to • green 65 Reddish gray. red-brown. brown, rea Greenish-gray, gray-green.