Bulletin C.

abundant Allentown average beds Beekmantown belt BETHLEHEM AND VICINITY Bushkill Byram calcite Cambrian cement rock Chestnut Hill clay conglomerate contains crystals Delaware River Delaware Water Gap deposits described dolomitic east Easton erosion fault feet folding formation formed furnaces Geol Geological glacial gneiss grains granitic Hardyston Hellertown hornblende igneous inches Indian iron Jacksonburg Jersey Kittatinny Blue Kittatinny Mountain Lehigh County Lehigh Gap Lehigh River Lehigh Valley lime limestone limonite localities lower Martinsburg material mile minerals mines Monocacy Creek moraine Moravian Heights Nazareth Northampton County numerous occur origin outcrops Paleozoic pegmatitic peneplane Pennsylvania places Pochuck gneiss Portland Cement pre-Cambrian precipitation present probably pyrite quarry quartz quartzite region ridge sand sandstone Saucon Valley sedimentary sericite serpentine shale Shawangunk side siliceous SiO2 slate slope soils South Mountain southeast specimens stone strata streams structure surface Survey temperature thickness tion Tomstown Township weathered Wind Gap