By William E. Edmunds, Jane R. Eggleston(auth.)
About The Product
Published by means of the yankee Geophysical Union as a part of the Field journey Guidebooks Series.
within the northern Appalachians, the boundary among the Mississippian and Pennsylvanian platforms 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 via wide erosion with regards to epeirogenic upwarping of the area. Biostratigraphically, the systemic boundary is positioned on the first incidence of the floral shape Neuropteris pocahontas (D. White) of floral region four as outlined by means of learn and Mamay (1964). despite the fact that, as a result of the frequent disconformable nature of the touch, the basal Pennsylvanian flowers is frequently more youthful.
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In regards to the ProductPublished by means of the yankee Geophysical Union as a part of the sector journey Guidebooks sequence. within the northern Appalachians, the boundary among the Mississippian and Pennsylvanian structures falls inside a posh sedimentary series unfold throughout a rapidly-subsiding depositional trough and an adjoining, extra sturdy craton margin.
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Extra 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
In the Pocahontas area of southwestern Virginia and southern West Virginia, the MississippianPennsylvanian boundary, by definition and on the basis of paleontologic data, has been placed at the contact between the Bluestone and Pocahontas Formations (Hennen and Gawthrop, 1915; Cooper, 1961). This longstanding practice is recognized in the Pennsylvanian System stratotype section at the eastern edge of the basin where the Pocahontas attains its maximum thickness. However, some modification of this concept was necessitated by the wedging out to the northwest of the lower sandstone member or basal tongue of the Pocahontas Formation into the upper beds of the Bluestone.
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.
0 Leave from north end of STOP #7, heading south on PA Rte. 403 Turn right across bridge Turn left onto Broad St. on PA Rte. S. Rte. S. Rte. S. Rte. 40 Turn right on Zehner Rd. II sign. Turn right at Keystone Lime Co. office (STOP #8 and LUNCH) STOP 8. , EICHORN QUARRY LOYALHANNA FORMATION AND LOWER MEMBER OF THE MAUCH CHUNK FORMATION The section at the Eichorn 'Quarry covers much of the same stratigraphic sequence of Late Mississippian age strata as the previous stop. However, two new units have appeared in the sequence and some other regional changes can be observed.