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Mapping Potential Geologic Hazards For DEPARTMENT OF CONSERVATION AND NATURAL RESOURCES COMMONWEALTH OF PENNSYLVANIA BUREAU OF TOPOGRAPHIC AND GEOLOGIC SURVEY Michael DiBerardinis, Secretary Edward G. Rendell, Governor Jay B. Parrish, Director Geologic map of the Route 15, Section C41 area showing bedrock geology, fold axes, Wisconsinan glacial extent, and mapped landslide locations. 80° 79° 78° 77° 76° 75° e ak n L ter 42° 42° as E Glaciated High Plateau Glaciated MAPPING POTENTIAL Northwestern Low Plateau High Glaciated Plateau Plateau D e e pVa y lle GEOLOGIC HAZARDS a l l V e e y it s c ra th S LYCOMING COUNTY n AU A Glaciated FOR PROPOSED HIGHWAY E Pocono T a Plateau 41° A ann 41° L queh us and P S l ain Pittsburgh Low and p l Mount CONSTRUCTION PROJECTS Low Plateau n U ley Mb l te lue Va ai ci B t nt Y a ea N u E thr Gr o L An A M L I ong t A Pr Mb Mb n V ing IN PENNSYLVANIA: H o ad e r n R Gettysburg- F D C i a N Newark Lowland A ch A y Waynesburg L alle IN y ala V Piedmont T A p E PL MDhm A Allegheny n p t N L ROUTE 15 IN Hills ea Lowland A A G Gr th O T 40° P ou in S 40° Mountain ghe S ta A D un M O P le I o Piedmont C l M D IC A Upland T MDhm A R E N I A TL LYCOMING COUNTY P A 80° 79° 78° 77° 76° 75° Location of road project area (shown in red) in the Deep Valleys section of the Appalachian Plateaus physiographic province, Lycoming County, Pennsylvania. BEDROCK GEOLOGY MDh Other Symbols Wisconsinan glacial extent. USGS GWSI water well Pp Pp, Pottsville Formation Teeth point toward ice. anticline Highway realignment Section C41 Mmc Mmc, Mauch Chunk Formation syncline Mapped landslides Mb Mb, Burgoon Formation n e l i i c MDhm MDhm, Huntley Mountain Formation ant Dck e Dck Dck, Catskill Formation u s H o Dck Geologic contact (with approximate scale error in light gray) n Photo site 3 -- Merged photos looking south to west over Route 15; timber has been cut in preparation for road realignment on southbound a g o C MDhm MDhm 4 Mb 3 Photo site 1 -- Scenery approaching Trout Run from the south. Photo site 2 -- Springs along northbound Route 15. Photo site 4 -- Vertical jointing in Catskill sandstone. ENVIRONMENTAL CHARACTERISTICS Delano and Wilshusen (1999) classified the area as a "high-susceptibility" zone of Mb landslide occurrence. Saturated shales and mudstones sequences on steep slopes Description and Potential Geologic Hazards have the potential to form landslides. Instability in the colluvium also may occur. Historic landslides on the route typically occurred on north-facing slopes. MDhm Mb The C41 section is almost entirely underlain by the Upper Devonian Catskill Formation. These rocks are dominated by interbedded and alternating red and gray Steep valley slopes with high vertical relief have the potential to form rock fall areas sandstones, siltstones, shales, and mudstones. The rocks are arranged in fining- where interbedded sandstones create ledges in relief to underlying mudstones and upward cycles from gray sandstones through red mudstones. shales. Fracturing perpendicular to bedding can enhance this potential. Mb Rocks are slightly folded; folds are broad and dips rarely exceed 15 degrees. Most Relatively high groundwater levels might be encountered in the valley areas. If 2 fracturing is steeply dipping (70 degrees or more) and parallel or perpendicular to sulfides associated with uranium deposits described previously are in a reduced state bedding. from a high groundwater table and are encountered and oxidized (change in Mb Mb groundwater table), they have the potential to produce some acid runoff. Mmc MDhm In the Catskill Formation of north-central Pennsylvania, localized enrichments of Mb copper and uranium in paleochannel lag deposits may exist. Such lag deposits also Wisconsinan glaciation penetrated the valleys of both the southern and northern Dck may contain elevated concentrations of trace elements of arsenic, lead, and silver, portions of the C41 section. Till deposits, if excavated, could be unstable with respect and may contain pyrite nodules (Smith and Hoff, 1984). to engineering characteristics. e i n Mmc c l MAP LAYERS n Bedrock geology units slightly modified from Miles, C. E., and Whitfield, T. G., sy compilers, 2001, Bedrock geology of Pennsylvania: Pennsylvania Geological Survey, 4th ser., dataset, scale 1:250,000 [www.dcnr.state.pa.us/topogeo/ Mmc map1/bedmap.aspx] (Geologic unit contacts were widened to reflect the coarser precision at 1:24,000.) Glacial boundary from Pennsylvania Geological Survey, 1995, Late Wisconsinan glacial border 1:100,000, digital dataset, URL address: [http://www.pasda.psu.edu/summary.cgi/dcnr/pags/ Mb pags_glacier1k.xml]. o e h Shaded relief and 3D imagery derived from 10-meter Digital Elevation Model (DEM) Mmc S data for the Cogan Station, Salladasburg, Trout Run, and White Pine 7.5-minute quadrangles, U. S. Geological Survey, 2000. Pp Base maps from digital raster graphics for the Cogan Station, Salladasburg, Trout Run, and White Pine 7.5-minute quadrangles, U. S. Geological Survey, 1996. Location of highway route by Gannett Fleming, Inc. for the Pennsylvania w Department of Transportation, 2007. n o S Mb REFERENCES Pp Mmc Berg, T.M. and Dodge, C.M., 1981, Atlas of preliminary geologic quadrangle maps of Pennsylvania: Pennsylvania Geological Survey, 4th Ser., Map 61, scale 1:62,500. MDhm Berg, T. M., Edmunds, W. E., Geyer, A. R., and others, compilers, 1980, Geologic WHITE PINE TROUT RUN map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, scale 1:250,000, 3 sheets. SALLADASBURG COGAN STATION Dck Crowl, G.H. and Sevon, W.D., 1980, Glacial border deposits of the late Wisconsinan age in northeastern Pennsylvania: Pennsylvania Geological Survey, 4th Ser., Pp General Geology Report 71, 68 p. 1 Delano, H.L. and Wilshusen, J.P., 1999, Landslide susceptibility in the Williamsport 1- by 2-degree quadrangle, Pennsylvania: Pennsylvania Geological Survey, 4th Ser., Environmental Geology Report 9, 192 p. Faill, R. T., 2007, unpublished dataset, Pennsylvania Geological Survey. 00.51MIWorkshop on Digital Mapping Techniques McCauley, J. F., 1961, Uranium in Pennsylvania: Pennsylvania Geological Survey, May 20 - 23, 2007 4th Ser., Mineral Resource Report 43, 71 p. Columbia, South Carolina Stuart Reese Smith, R.C., II and Hoff, D.T., 1984, Geology and mineralogy of copper-uranium 00.511.52KM occurrences in the Picture Rocks and Sonestown quadrangles, Lycoming and Pennsylvania Geological Survey Three-dimensional representation of local topography based on 10-meter DEM data. View is to the northwest; vertical exaggeration is 2X. State Plane Pennsylvania North (feet) Sullivan Counties, Pennsylvania: Pennsylvania Geological Survey, 4th Ser., Mineral North American Datum 1983 Wisconsinan glacial extent is shown in light blue. Fold axes are shown in green (Faill, 2007). Resource Report 80, 271 p. Original map scale 1:24,000.
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