. Baltimore county. Geology; Mines and mineral resources; Physical geography; Forests and forestry. Maryland Geological Survey 103 and Peters Creek formations make up what is here termed the Glenarm series. Because of relations established by the writers along the Susque- hanna River in Pennsylvania, the albite-chlorite schist is regarded as a i Peters Creek formation. schist quartzite and gneiss £ mica gneiss and schist IT on southeast * albite gneiss and schist on northeast coarse white dolomite marble quartzite, gneiss and schist UNCONFORMITY — Baltimore Gneiss biotite gneiss, including hor
. Baltimore county. Geology; Mines and mineral resources; Physical geography; Forests and forestry. Maryland Geological Survey 103 and Peters Creek formations make up what is here termed the Glenarm series. Because of relations established by the writers along the Susque- hanna River in Pennsylvania, the albite-chlorite schist is regarded as a i Peters Creek formation. schist quartzite and gneiss £ mica gneiss and schist IT on southeast * albite gneiss and schist on northeast coarse white dolomite marble quartzite, gneiss and schist UNCONFORMITY — Baltimore Gneiss biotite gneiss, including hornblende gneiss and banded injection gneiss Fig. 12.—Columnar Section of Rocks of Baltimore County. Igneous rocks:— 1. Hartley augen gneiss. 2. Port Deposit gneiss (granodiorite) and Relay quartz diorite. 3. Gabbro and serpentine (peridotite and pyroxenite). 4. Gunpowder granite. 5. Woodstock granite and associated pegmatites. 6. Diabase (Triassic). contemporaneous facies and the northern equivalent of the Wissahickon oligoclase-mica schist. The Baltimore gneiss had been intruded by gabbro and by granite. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Maryland Geological Survey; Berry, Edward Wilber, 1875-1945; Knopf, Eleanora Frances Bliss, 1883-; Jonas, Anna I. (Anna Isabel), 1881-; Mathews, Edward Bennett, 1869-; Watson, Edward Hahn, 1902-; Carter, William T. (William Thomas), 1877-; Snyder, Joseph M. , 1889-; Bruce, Oscar Clayton, 1891-; Nunn, Roscoe; Bauer, L. A. (Louis Agricola), 1865-1932; Besley, F. W. (Fred Wilson), 1872-1960. Baltimore, The Johns Hopkins press
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