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Stratigraphy

This gallery is devoted to stratigraphic features
Angular unconformity with Quaternary travertine overlying tilted Mesozoic sandstones and shales, Cody, WY
Angular unconformity with Quaternary travertine overlying tilted Mesozoic sandstones and shales, Cody, WY
Disconformity between massive Coconino Sandstone and thinner bedded Hermit Shale, Grand Canyon National Park, AZ
Disconformity between massive Coconino Sandstone and thinner bedded Hermit Shale, Grand Canyon National Park, AZ
Grand Canyon Series overlies the Vishnu Group in a non-conformity relationship, Grand Canyon National Park, AZ
Grand Canyon Series overlies the Vishnu Group in a non-conformity relationship, Grand Canyon National Park, AZ
(STRA4) Nonconformity between Cambrian Potsdam Fm. and Proterozoic Gneiss, Alexandria Bay, NY
(STRA4) Nonconformity between Cambrian Potsdam Fm. and Proterozoic Gneiss, Alexandria Bay, NY
Petrified Wood Petrified Forest National Park, AZ
Petrified Wood Petrified Forest National Park, AZ
Petrified wood weathers out of the Triassic Chinle Fm., Petrified Forest National Park, AZ
Petrified wood weathers out of the Triassic Chinle Fm., Petrified Forest National Park, AZ
(STRA7) Mudcracks in the Proterozoic Snowslip Fm., Logan Pass, Glacier National Park, MT
(STRA7) Mudcracks in the Proterozoic Snowslip Fm., Logan Pass, Glacier National Park, MT
(STRA8) Archean pillow lavas tilted on end with the top to the left, Shebondawan, Ontario, Canada
(STRA8) Archean pillow lavas tilted on end with the top to the left, Shebondawan, Ontario, Canada
(STRA9) Non-conformity between Pennsylvanian Fountain Fm. and underlying Proterozoic metamorphic rocks, Red Rocks Park, CO
(STRA9) Non-conformity between Pennsylvanian Fountain Fm. and underlying Proterozoic metamorphic rocks, Red Rocks Park, CO
(STRA10) Top view mudcracks.
(STRA10) Top view mudcracks.
(STRA11) Cross section of same mudcracks
(STRA11) Cross section of same mudcracks
(STRA12) Load casts, flute marks, and drag grooves, Normanskill Shale, Greene County, NY
(STRA12) Load casts, flute marks, and drag grooves, Normanskill Shale, Greene County, NY
(STRA13) Raindrop imprints and mudcracks in the Proterozoic Appekunney Fm., Glacier National Park, MT
(STRA13) Raindrop imprints and mudcracks in the Proterozoic Appekunney Fm., Glacier National Park, MT
(STRA14) Recent mudcracks and mud curls, IL
(STRA14) Recent mudcracks and mud curls, IL
(STRA15) Mudchips in Proterozoic Grinnell Fm., Glacier National Park, MT
(STRA15) Mudchips in Proterozoic Grinnell Fm., Glacier National Park, MT
(STRA16) Mudcracks in the Proterozoic Grinnell Fm., Glacier National Park, MT
(STRA16) Mudcracks in the Proterozoic Grinnell Fm., Glacier National Park, MT
(STRA17)  Asymmetrical ripple marks in the Proterozoic Snowslip Fm., Glacier National Park, MT
(STRA17) Asymmetrical ripple marks in the Proterozoic Snowslip Fm., Glacier National Park, MT
(STRA18) Symmetrical ripple marks in the Proterozoic Lorrain Fm., Desbarats, Ontario, Canada
(STRA18) Symmetrical ripple marks in the Proterozoic Lorrain Fm., Desbarats, Ontario, Canada
(STRA19) Asymmetrical ripple marks in sand caused by the current of the Colorado River, Lees Ferry, AZ
(STRA19) Asymmetrical ripple marks in sand caused by the current of the Colorado River, Lees Ferry, AZ
(STRA20) Asymmetrical ripple marks with current from left to right.
(STRA20) Asymmetrical ripple marks with current from left to right.
(STRA22) Asymmetrical ripple marks (current from top to bottom) on sandstone tilted on end, Ontario, Canada
(STRA22) Asymmetrical ripple marks (current from top to bottom) on sandstone tilted on end, Ontario, Canada
Stylolites in oolitic limestone, IA
Stylolites in oolitic limestone, IA
(STRA24) Channel cut and fill in Triassic Moenkopi Fm, near Holbrook, AZ
(STRA24) Channel cut and fill in Triassic Moenkopi Fm, near Holbrook, AZ
(STRA25) Graded bedding (turbidites) allows determination of top of folded beds, Proterozoic Vermillion Lake FM., Tower, MN
(STRA25) Graded bedding (turbidites) allows determination of top of folded beds, Proterozoic Vermillion Lake FM., Tower, MN
(STRA26) Graded bedding (top to upper left) in  vertically dipping Proterozoic turbidites of the Lake Vermillion Fm, Tower, MN
(STRA26) Graded bedding (top to upper left) in vertically dipping Proterozoic turbidites of the Lake Vermillion Fm, Tower, MN
(STRA27) Close-up of graded bedding in the Proterozoic Vermillion Lakes Fm., Tower, MN
(STRA27) Close-up of graded bedding in the Proterozoic Vermillion Lakes Fm., Tower, MN
(STRA28) Sandstone pinch out in shales in the Jurassic Morrison Fm. near Green River, WY
(STRA28) Sandstone pinch out in shales in the Jurassic Morrison Fm. near Green River, WY
(STRA29) Sandstone with variable concentrations of iron oxides, UT
(STRA29) Sandstone with variable concentrations of iron oxides, UT
 Fluting in soft shales of the Ricardo Fm., Red Rock Canyon State Park, CA
Fluting in soft shales of the Ricardo Fm., Red Rock Canyon State Park, CA
(STRA31) Complex ripples in Proterozoic Snowslip Fm., Glacier National park, MT
(STRA31) Complex ripples in Proterozoic Snowslip Fm., Glacier National park, MT
(STRA32) Continental redbeds underlie gray marine layers of the Devonian Catskill Fm. near Scranton, PA
(STRA32) Continental redbeds underlie gray marine layers of the Devonian Catskill Fm. near Scranton, PA
 Rounded and flattened cobbles along the shoreline of Lake McDonald, Glacier National Park, MT
Rounded and flattened cobbles along the shoreline of Lake McDonald, Glacier National Park, MT
(STRA34) Turbidites in Mississippian Tesnus Fm. near Marathon, TX
(STRA34) Turbidites in Mississippian Tesnus Fm. near Marathon, TX
(STRA35) El Capitan, a Permian reef deposit, Gaudalupe Mountains National Park, TX
(STRA35) El Capitan, a Permian reef deposit, Gaudalupe Mountains National Park, TX
Cross bedding in Jurassic Navajo Sandstone, North Coyote Buttes, AZ
Cross bedding in Jurassic Navajo Sandstone, North Coyote Buttes, AZ
(STRA37) Mudballs in continental redbeds of the Devonian Catskill Fm., Scranton, PA
(STRA37) Mudballs in continental redbeds of the Devonian Catskill Fm., Scranton, PA
(STRA38) Shale and limestone facies in Pennsylvanian rocks at Cagles Mill Dam site, IN
(STRA38) Shale and limestone facies in Pennsylvanian rocks at Cagles Mill Dam site, IN
Navajo Twins show differences in bedding of Jurassic Bluff Ss. (massive) and  Summerville Fm. (thin), Bluff, UT
Navajo Twins show differences in bedding of Jurassic Bluff Ss. (massive) and Summerville Fm. (thin), Bluff, UT
(STRA40) Cross cutting relationships in igneous intrusions.
(STRA40) Cross cutting relationships in igneous intrusions.
(STRA41) Fluvial cross-bedding in the  Cambrian Chapel Rock Fm.,  Pictured Rocks National Lakeshore MI
(STRA41) Fluvial cross-bedding in the Cambrian Chapel Rock Fm., Pictured Rocks National Lakeshore MI
(STRA42) Proterozoic Gunflint Chert contains cyanobacteria 1.9 BY old, Kakabek Falls, Ontario, Canada
(STRA42) Proterozoic Gunflint Chert contains cyanobacteria 1.9 BY old, Kakabek Falls, Ontario, Canada
(STRA43) Debris flow breccia in Mosaic Canyon, Death Valley National Park, CA
(STRA43) Debris flow breccia in Mosaic Canyon, Death Valley National Park, CA
(STRA44) Coal in the Jurassic Fernie Fm., Alberta, Canada
(STRA44) Coal in the Jurassic Fernie Fm., Alberta, Canada
(STRA45) Asymmetrical ripple marks, Monument Valley, AZ
(STRA45) Asymmetrical ripple marks, Monument Valley, AZ
(STRTA46) Well rounded, sorted, and frosted quartz grains, Ordovician St. Peter Sandstone, IL
(STRTA46) Well rounded, sorted, and frosted quartz grains, Ordovician St. Peter Sandstone, IL
(STRA47) Quartz pebbles with mostly  high roundness and moderate sphericity, Pennsylvanian Potsville Conglomerate, Scranton, PA
(STRA47) Quartz pebbles with mostly high roundness and moderate sphericity, Pennsylvanian Potsville Conglomerate, Scranton, PA
Asymmetrical ripple marks in the  Moenkopi Fm., Capitol Reef National Park, UT
Asymmetrical ripple marks in the Moenkopi Fm., Capitol Reef National Park, UT
Checkerboard Mesa cross-bedding, Zion National Park, UT
Checkerboard Mesa cross-bedding, Zion National Park, UT
Geologist at Checkerboard Mesa, Zion National Park, UT
Geologist at Checkerboard Mesa, Zion National Park, UT
Coal Mine Canyon cut and fill. AZ
Coal Mine Canyon cut and fill. AZ
Chalk deposits at Monument Rocks National Natural Landmark, KS
Chalk deposits at Monument Rocks National Natural Landmark, KS
White River Formation, Badlands National Park, SD
White River Formation, Badlands National Park, SD
Wet beach cobbles, Lake McDonald, Glacier National Park, MT
Wet beach cobbles, Lake McDonald, Glacier National Park, MT
Cross-section of debris flows and angular unconformity, Phoenix, AZ
Cross-section of debris flows and angular unconformity, Phoenix, AZ