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Photo ID: h0wm7p	Subject: Structure	Description
	Arcuate Structure; Colorado Plateau; Erosional Feature; Geomorphology; Salt Canyon	Angel Arch in Canyonlands National Park is a typical product of differential stream and wind erosion in sandstone and shale sequences.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Utah; Canyonlands National Park
Photo Quality \| Large

Photo ID: h0wm9w	Subject: Dunes	Description
	Arcuate Structure; Colorado Plateau; Erosional Feature; Geomorphology; Slick Rock Member	Sand dune arch exhibiting how differential erosion has removed slightly less resistant material, leaving the more resistant rock standing in relief.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Utah; Arches National Park
Photo Quality \| Large

Photo ID: h0wmbo	Subject: Sedimentary Rocks	Description
	Arcuate Structure; Colorado Plateau; Erosion; Geomorphology	Stream and wind erosion have differentially removed the less resistant portion under, over and beside this natural bridge, leaving it standing in relief.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Utah; Rainbow Bridge National Monument
Photo Quality \| Large

Photo ID: h0wmdj	Subject: Sedimentary Rocks	Description
	Cedar Mesa Sandstone; Colorado Plateau; Erosional Features; Geomorphology	Monument Basin from the air, looking north to Junction Butte and Grand View Point. The spires result from wind and stream erosion removing the surrounding, less resistant rock. Jointing within the formation aids in the erosion process.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Utah; Canyonlands National Park
Photo Quality \| Large

Photo ID: h0wmh5	Subject: Sedimentary Rocks	Description
	Colorado Plateau; Geomorphology	Upper Elephant Canyon in Canyonlands National Park shows how wind and water have eroded the canyon into the sandstone and shale bedrock.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	North America; United States; Utah; Canyonlands National Park
Photo Quality \| Large	Available for Commercial Use

Photo ID: h0wmse	Subject: Structure	Description
	Colorado Plateau; Cross-Bedding; Cross-Stratification; Eolian Environment; Grand Canyon National Park; Lamination; Planar Bedding Structures; Sedimentary Structures	Compound cross-stratification (cross-bedding) in Esplanade Sandstone. Man at right gives scale to these complexly developed beds, which have been produced by stream or wind currents blowing sand across a surface on which sand was accumulating. Scouring of the stream floor by turbulent flowing water may create small depressions in the channel deposits, which later will be refilled by inclined beds.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Arizona; Grand Canyon National Park
Photo Quality \| Large

Photo ID: h0wmuf	Subject: Structure	Description
	Bedding Plane Irregularities; Geomorphology; Modern Mudcracks; Sedimentary Structures; Shrinkage Cracks	Mud cracks form by desiccation and shrinkage of silt or clay. The cracks outline roughly polygonal areas that make this honeycombed surface.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Arizona; Grand Canyon National Park
Photo Quality \| Large

Photo ID: h0wmwk	Subject: Structure	Description
	Bedding Plane Irregularities; Carboniferous; Geomorphology; Mud cracks; Pacacho Butte; Sedimentary Structures; Shrinkage cracks; Watahomigi Formation	Ancient mudcracks (shrinkage cracks) preserved in red-brown mudstone near the base of the Watahomigi Formation. Pencil is for scale. View Geological Time Scale for this image.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Arizona; Pacacho Butte
Photo Quality \| Large

Photo ID: h0wmyl	Subject: Glaciers	Description
	Glacial Features; Glacial Lake; Granadier Range; Moraine; Rocky Mountains; San Juan Mountains	Glacial moraine holding lake at the base of the Granadier Range. Large blocks of glacially derived material were dumped at the down-valley side of the glacier when it was active. The moraine dammed melt waters from the receding glacier to form a lake.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Colorado; San Juan Mountains
Photo Quality \| Large

Photo ID: h0wn0f	Subject: Glaciers	Description
	Bedding Plane Irregularities; Erosion; Glacial Features; Glacier National Park; Grooves; Sperry Glacier; Striations	Glacial striations on bedrock. Rocks embedded in the bottom of the glacier served as "tools" that scratched the bedrock over which the glacier moved. These features are useful indicators both of the former presence of glaciers and of the direction in which the glacier moved.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Montana; Glacier National Park
Photo Quality \| Large

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