The Geology of Lehigh and Northampton Counties

50 feet abandoned quarry Allentown anticlinal axis Bangor Berks county Bethlehem blue bowlders breccia Bushkill Catasauqua Chestnut hill clay colored crest damourite slate decomposed Delaware river deposit Easton exposed exposures feet deep feet thick feldspar feldspathic gneiss granulite flat formation full of water furnace geological gneiss occur gravel gray feldspathic gneiss half a mile Hexenkopf hornblendic Iron Kittatinny mountain Laurentian Lehigh county Lehigh river Lehigh Water Gap lime Limeport limestone limestone belt limonite magnesian magnetite Martin's creek mile east mile north mile south mile west north-east Northampton county northern occur loose outcrop Pennsylvania postage Potsdam quartzite Potsdam sandstone pyroxene quartz quartzite railroad REPORT OF PROGRESS ridge road rock roofing slate sand Saucon creek Saucon Valley seen shale Shimersville slate belt slate quarry slates dip slates show Slatington South mountains south-east stone strata summit surface syenite synclinal thin bedded township Trenton Upper vertical Wind gap Zionsville