Bulletin of the Geological Society of America, Volume 12, Parts 1-128Geological Society of America, 1900 - Geology |
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15 feet basin biotite channel clay cleavage cliffs color crystals decayed decomposition deposits depth drainage east epidote eroded erosion eruption esker extinction angles feet deep feet in diameter feldspar flowing formed GEOL Georgia giants glacial drift glacial lakes Glacial period glacial potholes glacier gneiss gorges granite gravel groundmass hornblende Ice age ice-lobe ice-sheet interglacial interglacial stage Interstate park kame lake Saint Croix lake Superior lava localities Lower Dalles magnetite Mauna miles long minerals Minnesota Minnesota Geological Survey minutes Mississippi modified drift moraine moulin torrent mountain mouth nearly northeast northern northward o'clock observed outlet phenocrysts plagioclase porphyritic preglacial present probably Professor quarry rock kettle Saint Croix Dalles Saint Croix Falls Saint Croix river Saint Croix valley sand side slope square miles subglacial stream surface Taylors Falls terraces Tertiary twins Upper Dalles vertical WARREN UPHAM waterworn Western Superior Wisconsin