Figure 3 - uploaded by Ronald Sloto
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Context 1
... Big Elk Creek Basin in the study area is underlain almost entirely by crystalline rocks of the Piedmont Physiographic Province ( fig. 3). Most of these rocks have undergone more than one epi- sode of deformation, and almost all exhibit compo- sitional alteration. The lowermost part of the study area and almost all of the Big Elk Creek Basin south of the study area is underlain by unconsoli- dated Coastal Plain sediments of the Potomac Group ( fig. 3). The geologic ...
Context 2
... Physiographic Province ( fig. 3). Most of these rocks have undergone more than one epi- sode of deformation, and almost all exhibit compo- sitional alteration. The lowermost part of the study area and almost all of the Big Elk Creek Basin south of the study area is underlain by unconsoli- dated Coastal Plain sediments of the Potomac Group ( fig. 3). The geologic units range in age from Lower Paleozoic to Cretaceous (table 1). Most of the Big Elk Creek Basin in Pennsylva- nia is underlain by Wissahickon Schist. The Wissa- hickon Schist consists of metasediments metamor- phosed to amphibolite grade. The Wissahickon is a light to medium gray, fine-to medium-grained, ...
Context 3
... James Run Formation, which is undivided on figure 3, is an interlayered quartz amphibolite and biotite-quartz-plagioclase gneiss of probable volcanic and volcaniclastic origin. The James Run Formation is divided into seven formally named members described by Higgins and Conant (1990, p. 21-37). ...
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