![](../../pictures/archives/compress/2008/666/jpeg/06t.jpg) 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
![](../../pictures/archives/compress/2008/666/jpeg/05t.jpg) 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
![](../../pictures/archives/compress/2008/666/jpeg/03t.jpg) Old suspension bridge over a tributary of Lampasas River at the head of Stillhouse Hollow Nature Trail in Chalk Ridge Falls Park. Belton - Killeen, Texas, August 17, 2008
![](../../pictures/archives/compress/2009/749/jpeg/06t.jpg) Pretty sneezeweed (Helenium elegans) with down-flexed ray flowers near Lampasas River in Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, May 17, 2009
![](../../pictures/archives/compress/2008/666/jpeg/01t.jpg) Waterfall of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
![](../../pictures/archives/compress/2008/666/jpeg/04t.jpg) Waterfall and a pond of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
![](../../pictures/archives/compress/2008/666/jpeg/02t.jpg) Steel cable suspension bridge downstream from the falls in Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
![](../../pictures/archives/compress/2009/749/jpeg/04t.jpg) Waterfall of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, May 17, 2009
![](../../pictures/archives/compress/2009/749/jpeg/05t.jpg) A spring with maiden ferns of a small creek in Chalk Ridge Falls Park. Belton - Killeen, Texas, May 17, 2009
![](../../pictures/archives/compress/2001/199/jpeg/16t.jpg) Tributary of Nahal Darokh river going through chalk hills 4 miles east from Sde Boker, view from lower site. The Middle East, April 9, 2001
![](../../pictures/archives/compress/2001/187/jpeg/16t.jpg) A dry riverbed at spring of a tributary of Nahal Revivim descending from a mountain ridge near Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2001/187/jpeg/17t.jpg) Spring flowers in a riverbed of a tributary of Nahal Revivim descending from a mountain ridge near Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2008/692/jpeg/05t.jpg) Rocks and a cave near Pedernales Falls. Johnson City, Texas, November 29, 2008
![](../../pictures/archives/compress/2008/692/jpeg/04t.jpg) Cave on private property near Pedernales Falls. Johnson City, Texas, November 29, 2008
![](../../pictures/archives/compress/2019/2428/jpeg/25t.jpg) Some whitish lichen on a limestone rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/04t.jpg) Button lichen (Buellia) on limestone near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/03t.jpg) Button lichen (Buellia) on limestone rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2008/683/jpeg/17t.jpg) Lake below the falls in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2019/2429/jpeg/15t.jpg) Some dark-green crustose lichen on a limestone rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2428/jpeg/07t.jpg) Limestone rocks near the falls in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2428/jpeg/21t.jpg) Bordered scale lichen (Psora pseudorussellii) on a limestone conglomerate rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2001/179/jpeg/06t.jpg) A cave at the entrance to a canyon of Bokek River. Ein Bokek, the Middle East, February 22, 2001
![](../../pictures/archives/compress/1999/109/jpeg/07t.jpg) Limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
![](../../pictures/archives/compress/1999/109/jpeg/08t.jpg) Mushroom-like limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
![](../../pictures/archives/compress/2005/465/jpeg/25t.jpg) Cave deposits in Cathedral Cave in Onondaga Cave State Park. Leasburg, Missouri, September 24, 2005
![](../../pictures/archives/compress/2019/2428/jpeg/24t.jpg) Chiseled sunken disk lichen (Circinaria contorta, Aspicilia contorta) on limestone near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2428/jpeg/23t.jpg) Firedot lichen Caloplaca subsoluta (Squamulea subsoluta, Caloplaca irrubescens) on limestone near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2008/683/jpeg/20t.jpg) River downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/684/jpeg/08t.jpg) River flats in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/684/jpeg/16t.jpg) Cypresses on a river island in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/684/jpeg/21t.jpg) Rusty cypress foliage on a river in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/683/jpeg/22t.jpg) Opposite side of the river downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/666/jpeg/15t.jpg) Accumulation of long-legged harvestmen (Daddy longlegs) spiders in Tonkawa Indian Cave in Mother Neff State Park. Moody, Texas, August 23, 2008
![](../../pictures/archives/compress/2008/683/jpeg/23t.jpg) View from opposite side of the river downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/683/jpeg/18t.jpg) Cypress Pool below the falls in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/681/jpeg/09t.jpg) Creek and a cypress in McKinney Falls State Park, near Upper falls. Austin, Texas, October 26, 2008
![](../../pictures/archives/compress/2008/684/jpeg/10t.jpg) Pedernales River in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/684/jpeg/07t.jpg) Shores of Pedernales River below bluffs in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2008/692/jpeg/10t.jpg) Pedernales River in Beach Area in Pedernales Falls State Park. Johnson City, Texas, November 29, 2008
![](../../pictures/archives/compress/2002/304/jpeg/25t.jpg) Limestone and chalk cliffs from Maale Gishron ascent 3 miles west from Eilat. The Middle East, October 17, 2002
![](../../pictures/archives/compress/2002/247/jpeg/27t.jpg) Limestone and chalk cliffs from Maale Gishron ascent 3 miles west from Eilat. The Middle East, January 17, 2002
![](../../pictures/archives/compress/2002/304/jpeg/30t.jpg) Limestone and chalk cliffs from Maale Gishron ascent 3 miles west from Eilat. The Middle East, October 17, 2002
![](../../pictures/archives/compress/2008/681/jpeg/19t.jpg) Indian mallow (Abutilon fruticosa) near a parking of Upper falls in McKinney Falls State Park. Austin, Texas, October 26, 2008
![](../../pictures/archives/compress/2001/187/jpeg/08t.jpg) A tributary of Nahal Revivim descending from a mountain ridge near Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2001/187/jpeg/12t.jpg) A tributary of Nahal Revivim descending from a mountain ridge near Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2013/1132/jpeg/14t.jpg) Hollow part of a cypress tree in Pedernales Falls State Park. Johnson City, Texas, January 12, 2013
![](../../pictures/archives/compress/2008/684/jpeg/06t.jpg) Cypress trees lining Pedernales River below bluffs in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2013/1132/jpeg/18t.jpg) Hollow part of a cypress tree at sunset in Pedernales Falls State Park. Johnson City, Texas, January 12, 2013
![](../../pictures/archives/compress/2001/208/jpeg/27t.jpg) View of Nahal Tseelim canyon from a southern tributary with En Aneva spring 2.5 miles north from Masada. The Middle East, May 17, 2001
![](../../pictures/archives/compress/2008/683/jpeg/25t.jpg) Blue flowers of mealy sage (Salvia farinacea) on opposite side of the river downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
![](../../pictures/archives/compress/2001/187/jpeg/32t.jpg) Red anemones in a riverbed of a tributary of Nahal Revivim descending from a mountain ridge to Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2007/581/jpeg/01t.jpg) A forest near Devil s Cave near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
![](../../pictures/archives/compress/2001/187/jpeg/19t.jpg) Common flowers in a riverbed of a tributary of Nahal Revivim descending from a mountain ridge near Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2001/187/jpeg/31t.jpg) Garlic-like flowers in a riverbed of a tributary of Nahal Revivim descending from a mountain ridge to Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2007/581/jpeg/02t.jpg) Boulder field near Devil s Cave near northern entrance of John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
![](../../pictures/archives/compress/2001/187/jpeg/18t.jpg) Blue pimpernel flowers in a riverbed of a tributary of Nahal Revivim descending from a mountain ridge near Yeroham reservoir. The Middle East, March 8, 2001
![](../../pictures/archives/compress/2007/585/jpeg/07t.jpg) Dark Hollow Falls near Skyline Drive. The Meadow, Virginia, May 16, 2007
![](../../pictures/archives/compress/2008/681/jpeg/18t.jpg) Texas aster with variegated fritillary(?) butterfly near a pond of Upper falls in McKinney Falls State Park. Austin, Texas, October 26, 2008
![](../../pictures/archives/compress/2016/1848/jpeg/04t.jpg) Underground river Poneretka emerging from a cave and meeting Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
![](../../pictures/archives/compress/2016/1848/jpeg/07t.jpg) Stream of underground river Poneretka emerging from a cave and meeting Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
![](../../pictures/archives/compress/2016/1848/jpeg/05t.jpg) Mouth of underground river Poneretka emerging from a cave and meeting Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
![](../../pictures/archives/compress/2016/1848/jpeg/06t.jpg) Underground river Poneretka emerging from a cave and meeting whitewater area of Msta River near Borovichi. Novgorod Region, Russia, July 3, 2016
![](../../pictures/archives/compress/2008/681/jpeg/17t.jpg) Dwarf yellow butterfly (Dainty Sulphur, Nathalis iole) on Texas aster near a pond of Upper falls in McKinney Falls State Park. Austin, Texas, October 26, 2008
![](../../pictures/archives/compress/2005/465/jpeg/26t.jpg) In Cathedral Cave in Onondaga Cave State Park. Leasburg, Missouri, September 24, 2005
![](../../pictures/archives/compress/2005/465/jpeg/24t.jpg) Cathedral Cave in Onondaga Cave State Park. Leasburg, Missouri, September 24, 2005
![](../../pictures/archives/compress/2000/138/jpeg/26t.jpg) A cave at the entrance to Ein Bokek Canyon. The Middle East, March 3, 2000
![](../../pictures/archives/compress/2019/2428/jpeg/18t.jpg) Cracked limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2016/1889/jpeg/13t.jpg) A cave near Linnalampi Lake. Southern Finland, August 27, 2016
![](../../pictures/archives/compress/2013/1265/jpeg/09t.jpg) Entrance of granite hollow of old powder bunker in north-west area of Monrepo (Mon Repos) Park. Vyborg, Russia, September 14, 2013
![](../../pictures/archives/compress/2019/2429/jpeg/11t.jpg) Various crustose lichens on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2428/jpeg/15t.jpg) Black limestone rocks in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/13t.jpg) Crustose lichens of different colors on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2428/jpeg/26t.jpg) Leather lichen (Dermatocarpon) on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/07t.jpg) Grey crustose lichen on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/08t.jpg) Leather lichen (Dermatocarpon) on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/09t.jpg) Black lichen Verrucaria on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/27t.jpg) Buellia and other lichens on a limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/29t.jpg) Lichens and sorrel on shady limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2008/681/jpeg/20t.jpg) Texas aster (Aster texanus) near a pond of Upper falls in McKinney Falls State Park. Austin, Texas, October 26, 2008
![](../../pictures/archives/compress/2002/247/jpeg/28t.jpg) Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, January 17, 2002
![](../../pictures/archives/compress/2002/304/jpeg/27t.jpg) Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, October 17, 2002
![](../../pictures/archives/compress/2002/304/jpeg/24t.jpg) Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, October 17, 2002
![](../../pictures/archives/compress/2002/304/jpeg/32t.jpg) Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, October 17, 2002
![](../../pictures/archives/compress/2011/978/jpeg/03t.jpg) Limestone with fossils at Brazos River near Whiskey Bridge, on Highway 21 west from Bryan. Texas, August 7, 2011
![](../../pictures/archives/compress/2019/2429/jpeg/02t.jpg) Tar-jelly lichen (Collema) on limestone conglomerate in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2428/jpeg/08t.jpg) Smooth limestone rocks near the water stream in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/12t.jpg) Dark-green crustose lichen on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/26t.jpg) Button lichen (Buellia) on a limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/05t.jpg) Button lichen (Buellia) on a limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/14t.jpg) Brown and orange crustose lichens on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/25t.jpg) Leather lichen (Dermatocarpon) on limestone in a forest in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2001/207/jpeg/32t.jpg) Northern tributary of Tseelim River, view from Roman road from Masada. The Middle East, May 17, 2001
![](../../pictures/archives/compress/2019/2429/jpeg/19t.jpg) Dust lichen (Lepraria) on limestone in shade of cliffs in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/22t.jpg) Ruffle lichen (Parmotrema) on a mossy limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/06t.jpg) Patches of button lichen (Buellia) on a limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/28t.jpg) Button lichen (Buellia) on a mossy limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/10t.jpg) Close up of black and green lichen Verrucaria on limestone in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/34t.jpg) Green Cladonia lichen on sandstone or limestone in a forest in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
![](../../pictures/archives/compress/2019/2429/jpeg/32t.jpg) White patch of Aspicilia lichen on a limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
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