. Bulletin of the Geological Society of America. Geology. 1:90 T. C. HOPKINS—CAMBRO-SILURIAN LIMONITE ORES The possible sources of the iron in the Cambro-Ordovician limonite ores are I 1) the Lower Cambrian slates, where it occurs both as pyrite and silicate; (2) the Cambro-Ordovician limestones and included slates, where it exists as diffused carbonate, sulphide, and silicate; (3) theover-. Jv\g*6«gHudson ftiverS/afes "\Cimbro-Ordovician Limestones. o ,co?le °ffeet 6foo lilMUI) Cambrian Quartzi+e. $£A£&Arc/rean Scn/stS. Figure 6.—Map of Portion of Great Valley Region, western Part of
. Bulletin of the Geological Society of America. Geology. 1:90 T. C. HOPKINS—CAMBRO-SILURIAN LIMONITE ORES The possible sources of the iron in the Cambro-Ordovician limonite ores are I 1) the Lower Cambrian slates, where it occurs both as pyrite and silicate; (2) the Cambro-Ordovician limestones and included slates, where it exists as diffused carbonate, sulphide, and silicate; (3) theover-. Jv\g*6«gHudson ftiverS/afes "\Cimbro-Ordovician Limestones. o ,co?le °ffeet 6foo lilMUI) Cambrian Quartzi+e. $£A£&Arc/rean Scn/stS. Figure 6.—Map of Portion of Great Valley Region, western Part of Lehigh Count}/, Pennsylvania. Showing distribution of the limonite ore pits. Reduced from map in Report 1> I), Second Geolog- ical Survey of Pennsylvania. lying Ordovician and Silurian shales and sandstones, where it occurs as carbonate, sulphide, and hydrous oxide. Tt is well known that all strata contain more'or less iron, and those in and bordering the limestone valleys of Pennsylvania are no 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 Geological Society of America. [New York : The Society]
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