Images

USGS scientists collect data for a landscape genetics study in the sagebrush of the Great Basin.

USGS Pacific Coastal and Marine Science Center’s research vessel R/V Parke Snavely motors on the Nisqually Reach of Puget Sound.

Eruptions in the Cascade Range during the past 4000 years. USGS GIP 64

Sunrise on Pompey Peak, Washington.

Specific Pathogen-Free (SPF) Pacific herring reared in the wet laboratory at the Marrowstone Marine Field Station.

Adult Oregon spotted frog at Dilman Meadows, near Wickiup Reservoir, OR

Aerial view of a USGS dye tracer study done on the Kootenai River in Idaho.

Panoramic photograph of Hailey, Idaho, looking southeast from Carbonate Mountain. 

A landscape photograph of a valley with a mountain in the background. The valley consists of forests and residential housing.

A pine forest with a dirt road running through it in Oregon. Photo taken as a part of field work during the Land Cover Trends project.

Gary Barton (USGS) collects particle size analysis samples of the surface riverbed material of the Kootenai River about three miles upstream from Bonners Ferry, ID.

Radially dipping strata of the cone include subequal proportions of lava flows and flow breccias and of proximal agglutinate and scoria falls, nearly all having 54 to 56 percent SiO2. Numerous mafic dikes and sills intrude the cone, and an apron of compositionally similar mafic lavas extends far outward from the cone.

Subalpine meadow near Deer Park campground on the Olympic Peninsula in Washington.

USGS scientist observing Mount St. Helens' crater and dome from the Brutus Camera station.

Typical clinical signs of SVC disease, exopthalmia and abdominal distension with hemorrhaging seen in a virus-exposed fathead minnow.

Mount Adams western profile as seen from Mount St. Helens.

Figure 1. Appearance of descaling site exposed to fast green FCF dye six hours after intentional descaling injury, showing loss of scales and presence of fast green staining. Areas of unintentional integumental injury are also stained (arrows).

Related image Figure 2.

Figure 2. Scanning electron micrograph of descaling area delimited by box in Figure 1 showing epidermal disruption, empty scale pockets and an exposed scale with visible concentric ridges (upper right). Scale bar = 500 µm.

Figure 3. Appearance of descaling site exposed to fast green FCF dye 96 hours after intentional descaling injury, showing lack of scales, presence of fast green staining in areas of epidermal disruption and absence of staining in areas where migrating epidermal cells have closed the wound.

Figure 4.  Scanning electron micrograph of descaling area delimited by box in Figure 3 showing epidermal disruption (arrows), empty scale pockets and restoration of epidermal integrity (asterisk). An exposed scale with visible concentric ridges is visible at the lower center. Scale bar = 500 µm.