Geology of the "Martic Overthrust" and the Glenarm Series in Pennsylvania and Maryland |
Other editions - View all
Common terms and phrases
abundant albite albite porphyroblasts analysis Antietam quartzite Antietam schist axis biotite Burnt Mills calcite Cambrian cent chlorite chloritoid chloritoid schists cleavage planes Cloos Conestoga limestone Creek crinkled crystallization deformation degrees epidote exposures fabric feldspar FIGURE flow cleavage fold axes formation fracture cleavage Frederick County garnet Glenarm Glenarm series gneiss Hietanen inclusions indicate intrusions Knopf and Jonas Lancaster County lineation localities main maximum Martic Forge Martic overthrust Maryland megascopic mica diagrams mica flakes mica orientation microcline microscopic mile mineral muscovite occur Octoraro schist Paleozoic parallel pegmatites Pequea Pequea Creek petrofabric phlogopite phyllite point maxima poles porphyroblasts pre-Cambrian pyrite quarry quartz quartz grains quartz maxima quartz orientation quartzite recrystallization Refton rock types rotation S-planes S₁ Safe Harbor schist facies sequence shale Shenks Ferry South Mountain southern Lancaster County specimen staurolite structures thin sections tion tourmaline transects Unconformity Vintage dolomite Wissahickon schist zone