Images

USGS researchers collect samples of dust from a sealcoated parking lot for analysis of polycyclic aromatic hydrocarbons (PAHs).  PAH concentrations in dust swept from coal-tar-sealcoated parking lots are 100s to 1000s of times higher than those swept from parking lots with other types of surfaces.

The flower, leaves, and seed pods of a tiny but aggressive vine (Centrosema virginianum) growing beside a path in a central Florida woodland. (Scanned From Negative)

Cory Emerson taking dissolved oxygen, temperature, and salinity readings from a potential relocation site for tidewater gobies in the Point Reyes National Seashore, CA.

Erythrina shows a cluster of its black seed pods with bright scarlet mature seeds lined up within. (Scanned From Negative)

Erythrina shows a cluster of its black seed pods with bright scarlet mature seeds lined up within. (Scanned From Negative)

Erythrina shows a cluster of its black seed pods with bright scarlet mature seeds lined up within. (Scanned From Negative)

The distinctive leaves of a Cardinal bean plant (Erythrina sp.) which aid in identifying the plant when the flowers or bean pods are not present.

The flower, leaves, and seed pods of a tiny but aggressive vine (Centrosema virginianum) growing beside a path in a central Florida woodland. (Scanned From Negative)

Erythrina shows a cluster of its black seed pods with bright scarlet mature seeds lined up within. (Scanned From Negative)

The distinctive leaves of a Cardinal bean plant (Erythrina sp.) which aid in identifying the plant when the flowers or bean pods are not present.

Erythrina shows a cluster of its black seed pods with bright scarlet mature seeds lined up within. (Scanned From Negative)

Hydrologic measurements in rice fields consisted of continuous measurements using pressure transducers calibrated with manual readings of staff gauges.

Delaney Creek, Yosemite National Park

Despite the haze of smoke from wildfires, visitors enjoy the beach in Santa Barbara, California.

USGS test well 10 34h363 in the East River, Brunswick, Ga. The U.S. Geological Survey drilled this test well in the early 1970's and at the time it was on the edge of the marsh at Andrews Island. It is now only accessible by boat or canoe at high tide. Despite being surrounded by saltwater the artesian well flows very fresh water from the Upper Floridan Aquifer.

Digital still photograph offshore of Half Moon Bay, California, showing a kelp greenling, encrusting sponges, red algae, cup coral, in mixed gravel, cobbles, and rugose rock outcrop with scattered shells at a depth of 9 meters.

Driveways in an upscale residential subdivision in Lake in the Hills, Ill., are coated with black coal-tar-based sealcoat, contrasting with the white cement sidewalk.

Sealcoat particles abraded from a parking lot with coal-tar-based sealcoat collect by the curbside.  Also shown is a storm drain, half coated with sealcoat, down which the loose particles will be washed by runoff.

A driveway in an upscale residential community in the Lake in the Hills, Ill, is coated with coal-tar-based sealcoat.  The driveway has a basketball hoop and a skateboard ramp.

Solar-powered streamage on Lackawaxen River, PA supports Lake Wallenpaupack hydropower facility.

USGS researcher sampling sediment from flooded rice fields after 1 month of growth. The caged fish 'Hg bioaccumulation' experiment can be seen in the foreground.