English: Brallier shale, these thick beds are thinly laminated and break down into thin chips on weathering. Cut on Pennsylvania railroad about half a mile east of Huntingdon, looking north. Huntingdon County, Pennsylvania. 1924. Plate 20 in U.S. Geological Survey. Folio 227. 1945.
The text of the report refers to this plate as follows:
The Brallier is predominantly a pale greenish-gray micaceous, sandy, and slaty shale, generally cleaving easily into thin laminae, but there are thin layers of coarser texture and less perfect cleavage. In railroad cuts half a mile east of Huntingdon very evenly bedded layers 1 to 2 feet thick appear, in their unweathered condition, to be fine-grained compact sandstone (pl. 20), but on weathering these beds reveal their thin lamination cleavage and ultimately break down to small, thin plates. The rock is really a stiff sandy shale.