Images

Three SCREE hikers traversing a thin hiking trail to the saddle that separates the two arms of the Green River that defines the Bowknot Bend at Mile 63.

Sections of a zircon crystal, only 100 micrometers across, showing stages of the crystal's growth. Upper panel shows the outer surface of the crystal, which is 131,000 years old based on 238U-230Th dating. This is when the crystal stopped growing. Lower panel shows the interior of the same zircon crystal.

Schematic diagram of Yellowstone's current magmatic system. A silicic crystal-mush (gray region with white crystals) is thought to underlie the caldera at a depth of ~5 km to 15 km, with more mafic basalt (in black) underneath.

Taken from the saddle, a panoramic view of the Bowknot Bend of the Green River. The Bowknot Bend is 7 river miles around. Erosion will eventually shorten the river course considerably.

The California Aqueduct flowing near Huron, CA in the San Joaquin Valley.  This spot is near one of several USGS land subsidence monitoring stations in the San Joaquin Valley.

On behalf of the Hawaiian Volcano Observatory, Carolyn Donlin, Chief of the USGS Menlo Park Publishing Service Center, accepted an award from the National Association of Government Communicators recognizing HVO's weekly "Volcano Watch" articles as excellent communication products.

Four recently hatched piping plover chicks huddle in the nest bowl on the Garrison Reach of the Missouri River, North Dakota

Sampling Big Sandy River below Farson, WY

USGS technicians collect water samples for eDNA analysis to estimate foothill yellow-legged frog (Rana boylii) presence at historically occupied sites throughout Oregon. These data are important for assessing the species' status and conservation needs. 

This image from a viewpoint at Dead Horse State Park in Utah shows horizontal Mesozoic sedimentary rocks characteristic of the Colorado Plateau. The Colorado River can be seen from this vantage point and this state park is located between Canyonlands National Park to the southwest and Arches National Park to the northeast.

At about Mile 102 you can see Dellenbaugh Butte, which is also known as The Anvil, or Inkwell Butte. Powell camped here July 14, 1869. The majority of the butte is composed of the Summerville Formation.

Female Southwestern Willow Flycatcher with colorful bands in 2019 on the upper San Luis Rey River. The bird was originally banded as a nestling by USGS biologist Scarlett Howell on the upper San Luis Rey River in July 2017.

Qu'est-ce que le cycle de l'eau?

This was the morning view from my tent at our camp (Mile 90) at Trin-Alcove Bend.

Chemicals can take a long time to appear in groundwater

USGS worked with regional partners to provide Ohio K-12 teachers educational resources to teach about watersheds in their classrooms. 

Details of Crystal Geyser can be found at https://geology.utah.gov/map-pub/survey-notes/geosights/crystal-geyser/ Photo shows tufa deposits at the geyser deposited by disolved calcium carbonate.

SCREE film maker, Ben Kraushaar, passes under I-70 at Green River, UT. The next time he will see a bridge over his boat will be 166 river miles away, on the Colorado River, at Hite, UT.

Two red sea urchins (Mesocentrotus franciscanus) sit on the deck of the R/V Falkor. These sea urchins were collected during the #HuntingBubbles research cruise led by the USGS and Schmidt Ocean Institute, which focused on exploring and understanding methane seeps and the communities that depend on them along the Cascadia Margin.

Delicate Arch in Arches National Park, Utah. https://www.usgs.gov/nationalparks Photo by Annie Scott, USGS

BsalSwabbing - The rough-skinned newt (Taricha granulosa) is a native western species susceptible to the salamander chytrid fungus, Batrachochytrium salamandrivorans (Bsal), in laboratory studies.