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1/2 mile east abundant Alpena bands barite basalt beaches Bluff brachiopods Brown bryzoans calcite celestite cephalopods chalcedony chert chlorastrolite clubs coal collecting areas collectors colors concretions County Creek crinoids cutting materials datolite deposits Devonian diamonds dolomite dumps epidote excavations exposed exposures fern field trips flint fluorite fossil corals fossil plants fossils fossils are found galena gastropods geodes glacial goethite gold granite gravel pits green gypsum Harbor hematite Highway hobbyists iron ranges jasper Keweenaw Lake Superior agates lapidary lapidary materials look marcasite marine fossils Midwest miles north miles south miles west mineral and fossil mines Minnesota Mississippi museums native copper nodules northeast northern Wisconsin Ohio Ordovician Ordovician fossils outcrops Park pelecypods Pennsylvanian Petoskey stones pink Pipestone plant fossils polish prehnite produced pyrite quartz quartz crystals quartzite railroad River road cuts rock sandstone selenite shale siderite Silurian southeast southern Illinois species specimens sphalerite streams thomsonite trilobites Wausau