Work of the Second Geological Survey of Pennsylvania
The Pocono Series of the Mississippian period entirely surrounds the Broadtop Basin of Huntingdon, Fulton, and Bedford counties of Pennsylvania. The best opportunities for its study are afforded by the gaps in Terrace Mountain northwest of the basin and just southeast of the Raystown Branch of the Juniata River near Saxton, Riddlesburg, and Hopewell, where the exposures are almost as perfect as could be desired; and in Sideling Hill, southeast of the basin and east of Robertsdale. Of these two regions the outcrops of Terrace Mountain are much the better. The Second Geological Survey of Pennsylvania long ago studied these terranes, the Pocono of Sideling Hill being exhibited in the well-known and much-discussed section of Ashburner,3 and that of Terrace Mountain in the equally known and more satisfactory sections of White.4 Stevenson5 also studied the Pocono in Bedford and Fulton counties, but . . .