Images

A USGS South Dakota Water Science Center streamgage was dedicated by Congressional and city officials on September 3 in Rapid City.

A USGS South Dakota Water Science Center streamgage was dedicated by Congressional and city officials on September 3 in Rapid City.

A USGS South Dakota Water Science Center streamgage was dedicated by Congressional and city officials on September 3 in Rapid City.

A USGS South Dakota Water Science Center streamgage was dedicated by Congressional and city officials on September 3 in Rapid City.

A USGS South Dakota Water Science Center streamgage was dedicated by Congressional and city officials on September 3 in Rapid City.

The USGS South Dakota Water Science Center is located in Rapid City, SD.

The stairs ascending Mound A from the east. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. The stairs climb from the legs and tail of the bird toward its head.

View of the primary mound, Mound A, looking north. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird.

A view from the crest of Mound A to the south. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. This view is of its left wing, looking towards Mound E, which can be seen at the edge of the green field.

Grizzly bear hair on barbed wire at a hair corral.  Bears climb over or under the corral and the hair collected provides information for genetic analysis.

The stairs descending Mound A to the east. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. Mound A is at the apex of a series of 6 concentric rings of raised earthworks. The rings were believed to have been the site of dwellings.

A panorama of the stairs descending Mound A to the east. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. Mound A is at the apex of a series of 6 concentric rings of raised earthworks. The rings were believed to have been the site of dwellings.

View of the primary mound, Mound A, looking northwest. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird.

The stairs ascending Mound A from the east. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. The stairs climb from the legs and tail of the bird toward its head.

A panorama of the stairs ascending Mound A from the east. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. The stairs climb from the legs and tail of the bird toward its head.

A view from the crest of Mound A of the stairs descending to the east. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. Mound A is at the apex of a series of 6 concentric rings of raised earthworks. The rings were believed to have been the site of dwellings.

Panorama of the primary mound, Mound A, looking north. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird.

A view from the crest of Mound A to the north. Mound A is also known as the "Bird Mound," because its original shape is believed to have been that of a bird. This view is of its right wing, looking towards Mound B, which is obscured in the trees.

Vegetation grows on an east-facing cliff along Bull Run near Sudley Springs in Manassas National Battlefield Park, Virginia. The cliffs are islands of specialized habitat; they support plant species found nowhere else in the park, including locally uncommon or rare species.

Left-stepping en echelon fractures characteristic of right-lateral fault displacement at the ground surface. Total fault slip measured near this location was 40-46 cm. Photo taken on main rupture strand near Buhman Rd.

Right-lateral offset of vineyard row of nearly 40 cm. Photo taken on the main fault rupture near Buhman Rd.