Oredezh River near red sandstone cliffs. Siverskaya south from Saint Petersburg, Russia, July 20, 2015
Red sandstone cliff at a bend of Oredezh River. Siverskaya south from Saint Petersburg, Russia, July 20, 2015
Sunken rim-lichen (Lecanora oreinoides) or may be Aspicilia on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Gorchakovshchina (Gorchakovsky) Waterfall and red sandstone cliffs near Volkhov. Leningrad Region, Russia, August 6, 2016
View of red sandstone cliffs of Oredezh River. Siverskaya south from Saint Petersburg, Russia, July 20, 2015
Red sandstone formations of Nahal Amir wadi, 5 miles north from Eilat. The Middle East, March 25, 2002
Red sandstone cliff facing Oredezh River. Siverskaya south from Saint Petersburg, Russia, July 20, 2015
Red sandstone cliff of Oredezh River in Siverskaya, 50 miles south from Saint Petersburg. Russia, July 13, 2017
Red sandstone at Gaye Avud near Mount Shehoret, 3 miles north from Eilat. The Middle East, March 14, 2002
Red sandstone on steep bank of Oredezh River in Siverskaya, 45 miles south from Saint Petersburg. Russia, August 16, 2018
Duck-like red sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Copper oxides in red sandstone of Mount Amir near the site of ancient copper mining, 5 miles north from Eilat. The Middle East, March 25, 2002
Morel-like red sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Red sandstone at Gaye Avud, 3 miles north from Eilat. The Middle East, March 14, 2002
Red sandstone of Nahal Amir wadi, 5 miles north from Eilat. The Middle East, March 25, 2002
Red sandstone of Griaznovka River springs in Rozhdestveno Village. Gatchina District of Leningrad Region, Russia, January 6, 2016
Red sandstone of Nahal Amir wadi, 5 miles north from Eilat. The Middle East, March 25, 2002
Red sandstone with fossils at Brazos River near Whiskey Bridge, on Highway 21 west from Bryan. Texas, August 9, 2013
Red sandstone with fossilized sea shells at Brazos River near Whiskey Bridge, on Highway 21 west from Bryan. Texas, August 9, 2013
Red sandstone with many sea fossils at Brazos River near Whiskey Bridge, on Highway 21 west from Bryan. Texas, August 9, 2013
Red sandstone with sea fossils at Brazos River near Whiskey Bridge, on Highway 21 west from Bryan. Texas, August 9, 2013
Red sandstone with fossilized shells at Brazos River near Whiskey Bridge, on Highway 21 west from Bryan. Texas, August 9, 2013
Buellia or may be Lecidella lichen on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Peppered rock-shield lichen Xanthoparmelia conspersa on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Black dotted lichen Buellia or may be Lecidella on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Peppered rock-shield lichen Xanthoparmelia conspersa with soredia on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Peppered rock-shield lichen Xanthoparmelia conspersa on sandstone in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Peppered rock-shield lichen Xanthoparmelia conspersa covering sandstone in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Black dots of a lichen Buellia or may be Lecidella on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Yellow cobblestone lichen Acarospora socialis on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Firedot lichen Squamulea squamosa (Caloplaca squamosa) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Firedot lichen Squamulea squamosa (Caloplaca squamosa) and other lichens on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
White crust of sunken rim-lichen (Lecanora oreinoides) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Pattern of white crust of sunken rim-lichen (Lecanora oreinoides) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Sunken rim-lichen (Lecanora oreinoides) and peppered rock-shield lichen (Xanthoparmelia conspersa) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Dust lichen (Lepraria) in shady spot on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Dust lichen (Lepraria) in shady spot on sandstone in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Buellia or may be Lecidella lichen on sandstone in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Rough speckled shield lichen (Punctelia rudecta) on sandstone in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Red sandstone with fossilized sea shells near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Red sandstone with fossils near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Red sandstone with many sea fossils near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Red sandstone with sea fossils near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Layer of fossilized sea shells in red sandstone near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Red sandstone cliff near Oredezh River. Siverskaya south from Saint Petersburg, Russia, July 20, 2015
Red sandstone near Oredezh River in Siverskaya, 45 miles south from Saint Petersburg. Russia, August 16, 2018
Red sandstone reflected in Oredezh River in Siverskaya, 45 miles south from Saint Petersburg. Russia, August 16, 2018
Chiseled sunken disk lichen (Circinaria contorta, Aspicilia contorta) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Crust of firedot lichen Squamulea squamosa (Caloplaca squamosa) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Texture of sunken rim-lichen (Lecanora oreinoides) on sandstone outcrops in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Deposits of fossilized sea shells in red sandstone near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Potato-like stones and fossilized sea shells in red sandstone near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Pattern of fossilized sea shells in red sandstone near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Peppered rock-shield lichen Xanthoparmelia conspersa under oaks and red cedar on sandstone rocks at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, February 24, 2021
