Mushroom-like limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
Erosion forms of limestone in a rock shelter at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Erosion forms of limestone on a rock shelter at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Tree roots and erosion forms on a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Creeping fern among dry leaves and needles on Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
Erosion of a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Erosion of limestone near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
Limestone rocks, view from Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
A.S. on Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
A.S. on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
View from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Forest near Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
A small maple on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Pine forest on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
Mushrooms in moss at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
A tree with very big leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Oak forest near Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
Flowers on a stone at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
Multicolor maple leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Bottom of a canyon, view from Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
Blueberry and rhododendron bushes on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
Unknown dwarf berries on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
View of a canyon from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
Rhododendron in a canyon, view from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
A fungus (?) on a birch, Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
Bamboo brushes on the bottom of a canyon near Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
View of canyon walls at evening from Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
Forest below Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
Rhododendron, fir and maples near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
Gray s Arch with rhododendron on foreground. Red River Gorge, Kentucky, November 6, 1999.
Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
View of rock shelters from the top of Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
Gray s Arch, view from rock shelters. Red River Gorge, Kentucky, November 6, 1999.
Gray s Arch, view from rock shelters. Red River Gorge, Kentucky, November 6, 1999.
Tobacco farm near Slade, Kentucky, November 5, 1999.
View of limestone erosion from a trail along a western slope of Mount Yoash, 4 miles north-west from Eilat. The Middle East, January 17, 2002
Limestone erosion in Harrarah (Al Kharrarah). Southern Qatar, March 27, 2015
Erosion of soft limestone in Harrarah (Al Kharrarah). Southern Qatar, March 27, 2015
Erosion of limestone slabs in Harrarah (Al Kharrarah). Southern Qatar, March 27, 2015
Erosion of limestone rocks in Harrarah (Al Kharrarah). Southern Qatar, March 27, 2015
Limestone cave with a spring of a tributary of Lampasas River near the entrance of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
Erosion of limestone near Salwa Road in area of Rawdat Ekdaim. Southern Qatar, April 11, 2015
Wind erosion of limestone cliffs in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, May 20, 2016
Erosion of beach limestone in Purple Island (Jazirat Bin Ghanim). Al Khor, Qatar, February 14, 2015
Erosion of limestone cliffs in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, April 1, 2016
View of Wabash River from a trail to Fort Ouiatenon. Indiana, November 13, 1999
Wind erosion of limestone cliffs in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, June 25, 2016
Erosion of the edge of limestone cliffs in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, April 1, 2016
Erosion of an orange limestone formation in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, April 1, 2016
Limestone wind erosion on the tabletop hill in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, April 29, 2016
Soil erosion in Happy Hollow Park. West Lafayette, Indiana, October 27, 1999.
Erosion of a limestone formation on a plateau of a tabletop mountain in Maszhabiya (Al Mashabiya) Reserve near Abu Samra. Southern Qatar, April 1, 2016
Limestone with fossils near Whiskey Bridge of Brazos River, on Highway 21 west from Bryan. Texas, November 29, 2019
Potholes Park, Fall Creek Gorge. The trip was organized by Purdue University International Center. Near Pine Village, Indiana, June 5, 1999.
Inspecting a creek in Potholes Park (Fall Creek Gorge) by international students of Purdue University. Near Pine Village, Indiana, June 5, 1999.
Overcoming a tub in a creek in Potholes Park (Fall Creek Gorge) by an international student of Purdue University. Near Pine Village, Indiana, June 5, 1999.
Cracked limestone of rocky ridge of Jebel Fuwairit. Qatar, January 31, 2015
Forest of Enfield gorge, from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
International students of Purdue University walking over rapids and tubs of a creek in Potholes Park (Fall Creek Gorge) near Pine Village. Indiana, June 5, 1999.
Limestone cliffs rocks of rocky ridge of Jebel Fuwairit. Northern Qatar, December 12, 2014
Fallen sycamore tree in snow near Gorge Trail in Taughannock Falls State Park. New York, November 23, 2005
Fossilized oyster sea shells Ostrea latimarginata(?) in a limestone layer (Dukhan Limestone Member) of Dammam Formation in Jaow Al Hamar depression south from Trainah. Southern Qatar, November 6, 2015
Bush of Lotus garcinii on limestone on a rocky ridge of Jebel Fuwairit. Northern Qatar, March 12, 2016
Fall colors of Enfield gorge, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
Andrachne telephioides growing from crack in limestone on a rocky ridge of Jebel Fuwairit. Northern Qatar, March 12, 2016
Entrance to Nahal Tseelim River Gorge, 2 miles north from Masada. The Middle East, January 20, 2001
River bed of a tributary of Lampasas River near the entrance of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
Fall colors of Enfield gorge, zoomed, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
Drying forest at Heritage Trail along Wabash River north from Lafayette. Indiana, September 11, 1999.
QNHG (Qatar Natural History Group) exploring fossils in limestone layer (Dukhan Limestone Member) of Dammam Formation in Jaow Al Hamar depression south from Trainah. Southern Qatar, November 6, 2015
A trail along Wabash River at Ross Hills Park 5 miles west from Lafayette. Indiana, October 30, 1999.
Plant of sea lavender (Qetaif, Limonium axillare) growing on limestone near a rocky ridge in Jabal Al Jassasiya, on north-eastern coast. Qatar, March 26, 2016
Seedling of Egyptian Fig-marigold (slenderleaf ice plant, Mesembryanthemum nodiflorum) growing on limestone on a rocky ridge of Jebel Fuwairit. Northern Qatar, March 12, 2016
Wabash Street Bridge across Chicago River. Sun-Times Daily News, Wrigley and Equitable Buildings are behind the bridge. Chicago, November 22, 1999
A.S. at entrance to Nahal Tseelim River Gorge from Dead Sea, 2 miles north from Masada, view from a parking place. The Middle East, January 20, 2001
Entrance to Nahal Tseelim River Gorge from Dead Sea, 2 miles north from Masada, view from a parking place. The Middle East, January 20, 2001
Sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Duck-like red sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Morel-like red sandstone erosion below western cliffs in Timna Park, 13 miles north from Eilat. The Middle East, November 7, 2002
Kathy Trail along Missouri River near Columbia, Missouri. October 23, 1999.
Kathy Trail along Missouri River near Columbia, Missouri. October 23, 1999.
Rocks along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
Rocks and bushes along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
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