Images

Sandbars in Grand Canyon are influenced by the amount of sand avaiable to build sandbars and the flow of the river, both of which are affected by Glen Canyon Dam.

View of reattachment sandbar located near the Carbon Creek drainage on Colorado River (River Mile 65).  Photo is from the long-term sandbar monitoring remote camera time-series archives, and shows the sandbar two months after the 2008 Spring High Flow Event.

Baldcypress trees line the Medina River, as well as other rivers in the Texas Hill Country.  Many trees get uprooted or broken off from periodic catastrophic floods.  Photo taken in Bandera Park. 

Scientists enter abandoned mine where bats hibernate in NY.

Scientists enter abandoned mine where bats hibernate in New York.

Orange seashell of a Giant lions-paw (Nodipecten subnodosus). Species identification is tentative.

Ornamented seashell of a fluted Tridacna. Tentatively identified as Tridacna squamosa.

Orange seashell of a Giant lions-paw (Nodipecten subnodosus). Species identification is tentative.

USGS scientists dig soil pits in Nevada's Amargosa Desert to study the distribution of natural perchlorate and to determine the atmospheric-soil-plant interactions that affected perchlorate's cycling in a terrestrial ecosystem.


Amargosa Desert, Nevada

~17 km south of Beatty; ~20 km east of Death Valley National Park.

Red-spotted newt in the leaf litter along a trail in Big South Fork National River and Recreation Area.

USGS scientist Karyn Rode takes a blood sample from a polar bear to estimate the diets of wild bears.

USGS scientist Karyn Rode takes a blood sample from a polar bear to estimate the diets of wild bears.

A Fence Lizard (tentative identification) on the side of a tree trunk near the Potomac River.

Rocks uncovered by a drought and a lower level of the Potamac River, at the Chesapeake and Ohio Canal National Historical Park, Maryland. The holes in the center rock are caused by circulating water holding a smaller rock or pebble up against the large rock, and the resulting friction eroding a "pothole," into the larger rock.

Rocks uncovered by a drought and a lower level of the Potomac River on Olmsted Island at the Chesapeake and Ohio Canal National Historical Park, Maryland. The holes in the center rock are caused by circulating water holding a smaller rock or pebble up against the large rock, and the resulting friction eroding a "pothole," into the larger rock.

Dr. David Blehert working in his laboratory at the USGS National Wildlife Health Center.

Dr. David Blehert working in his laboratory at the USGS National Wildlife Health Center.

USGS wildlife disease specialist Kim Miller outside of an abandoned mine where bats hibernate in NY.

USGS wildlife disease specialist Kim Miller outside of an abandoned mine where bats hibernate in New York.

Kim Miller collecting environmental samples in an abandoned mine where bats hibernate in NY

Affected WNS bats in MA mine 2008.