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bogyawn: 81st Unnamed Cave, coal sediment deposits, Alabama 27
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bogyawn: 81st Unnamed Cave, coal sediment deposits, Alabama 28
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 1
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 2
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 3
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 4
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 5
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 7
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bogyawn: Allegheny Formation, Pennsylvanian age, Gettamy Rockhouse, Fayette County, Pennsylvania 8
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bogyawn: Arkose Sandstone Conglomerate, Gordo Formation, Fall Line Pine Hills, Roberta Case Pine Hills Preserve, The Nature Conservancy of Alabama, Autauga County, Alabama
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bogyawn: Arkose Sandstone Conglomerate, Gordo Formation, Fall Line Pine Hills, Roberta Case Pine Hills Preserve, The Nature Conservancy of Alabama, Autauga County, Alabama
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bogyawn: Chalybeate Spring, Frankfort Mineral Springs Falls, Raccoon Creek State Park, Beaver County, Pennsylvania 5
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bogyawn: Chattanooga Shale (Devonian), Fort Payne Chert (Mississippian), Contact, Duck River Gorge, Old Stone Fort State Park, Coffee County, Tennessee
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bogyawn: Chattanooga Shale (Devonian), Fort Payne Chert (Mississippian), Contact, Duck River Gorge, Old Stone Fort State Park, Coffee County, Tennessee 2
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bogyawn: Chewacla Creek, Hollis Quartzite Outcrop, Chewacla State Park, Lee County, Alabama
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bogyawn: Chrysotile (possible identification), in Metabasalt, Catoctin Formation, Precambrian age, Franklin County, Pennsylvania
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bogyawn: Coal seams, Cumberland Plateau, Alabama 1
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bogyawn: Coal seams, Cumberland Plateau, Alabama 2
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bogyawn: Colluvium erosional patterns, Erie Bluffs, Erie County, Pennsylvania 2
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bogyawn: Colluvium erosional patterns, Erie Bluffs, Erie County, Pennsylvania 3
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bogyawn: Colluvium erosional patterns, Erie Bluffs, Erie County, Pennsylvania 4
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bogyawn: Columnar Jointed Metarhyolite, Catoctin Formation, Precambrian Age, Adams County, Pennsylvania 1
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bogyawn: Columnar Jointed Metarhyolite, Catoctin Formation, Precambrian Age, Adams County, Pennsylvania 2
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bogyawn: Columnar Jointed Metarhyolite, Catoctin Formation, Precambrian Age, Adams County, Pennsylvania 3
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bogyawn: Columnar Jointed Metarhyolite, Catoctin Formation, Precambrian Age, Adams County, Pennsylvania 4
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bogyawn: Columnar Jointed Metarhyolite, Catoctin Formation, Precambrian Age, Adams County, Pennsylvania 5
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bogyawn: Diabase (weathered surface), Triassic age, Devil's Den Area, Gettysburg National Military Park, Adams County, Pennsylvania 1
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bogyawn: Diabase (weathered surface), Triassic age, Devil's Den Area, Gettysburg National Military Park, Adams County, Pennsylvania 2
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bogyawn: Diabase (weathered surface), Triassic age, Devil's Den Area, Gettysburg National Military Park, Adams County, Pennsylvania 3
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bogyawn: Diabase (weathered surface), Triassic age, Devil's Den Area, Gettysburg National Military Park, Adams County, Pennsylvania 4