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Differential erosion, Kansas
Differential erosion between sandstone concretion and poorly cemented sandstone of the Cretaceous Dakota Formation, Mushroom Rocks State Park, Kansas. (251014-40)
Download ImageDifferential erosion, Kansas
Differential erosion between sandstone concretion and poorly cemented sandstone of the Cretaceous Dakota Formation, Mushroom Rocks State Park, Kansas. (251014-37)
Download ImageDifferential erosion, Kansas
Differential erosion between sandstone concretion and poorly cemented sandstone of the Cretaceous Dakota Formation, Mushroom Rocks State Park, Kansas.(251014-10)
Download ImageHorizontal Permian strata, Kansas
Permian Chase Group, tan limestone over green and red shale and siltstone. Near Manhattan, Kansas. (251014-6)
Download ImageHorizontal Permian strata, Kansas
Permian Chase Group, tan limestone over green and red shale and siltstone. Near Manhattan, Kansas. (251014-4)
Download ImageDifferential erosion, Kansas
Undercutting of resistant sandstone beds by erosion of softer shale, Permian Chase Group, Kansas (251014-2)
Download ImageLimestone bluffs on Missouri River
Bluffs of Mississippian Burlington Limestone along the Missouri River, near Columbia, Missouri (251013-28)
Download ImageCave entrance, Missouri
Cave entrance in Mississippian Burlington Limestone. Rockbridge State Park, Columbia, Missouri (251013-47)
Download ImageCave entrance, Missouri
Cave entrance in Mississippian Burlington Limestone. Rockbridge State Park, Columbia, Missouri (251013-34)
Download ImageLimestone bluffs on Missouri River
Bluffs of Mississippian Burlington Limestone along the Missouri River, near Columbia, Missouri (251013-28)
Download ImageCave entrance, Missouri
Cave entrance in Mississippian Burlington Limestone. Rockbridge State Park, Columbia, Missouri (251013-9)
Download ImageCave entrance, Missouri
Short cave in Mississippian Burlington Limestone. Rockbridge State Park, Columbia, Missouri (251013-7)
Download ImageMississippian Limestone, Illinois
Mississippian Salem Limestone and overlying St. Louis Limestone, western Illinois (251012-39)
Download ImageMississippian Limestone, Illinois
Mississippian Salem Limestone and overlying St. Louis Limestone, western Illinois (251012-38)
Download ImageUnderground limestone quarry, Illinois
Underground quarry in Mississippian Salem and overlying St. Louis Limestone, western Illinois (251012-34)
Download ImageUnderground limestone quarry, Illinois
Underground quarry in Mississippian Salem and overlying St. Louis Limestone, western Illinois (251012-30)
Download ImageDevonian siltstone, Pennsylvania
Devonian siltstone of the Brallier Formation, near Schellsburg, Pennsylvania (251011-15)
Download ImageDevonian siltstone, Pennsylvania
Devonian siltstone of the Brallier Formation, near Schellsburg, Pennsylvania (251011-13)
Download ImageJurassic basalt and redbeds, Connecticut
Early Jurassic, rift-related Hampton Basalt overlying red beds of the East Berlin Formation, Berlin, Connecticut (250923-41)
Download ImageJurassic basalt and redbeds, Connecticut
Early Jurassic Hampton Basalt overlying red beds of the East Berlin Formation, Berlin, Connecticut (250923-40)
Download ImageTriassic Palisades sill, New Jersey
Cliff of Triassic diabase making up the Palisades Sill, New Jersey, (250923-36) intrusion, igneous
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