Images

This report includes five chapters. Chapter A (Mason, Knight, and others, 2020) is a summary of this multichapter volume and briefly describes the study area. Chapter B (Mason, Bills, and Macy, 2020) describes the geology and hydrology of the Truxton basin and Hualapai Plateau.

Lahontan cutthroat trout (Oncorhynchus clarkii henshawi) is a federally listed threatened species. Ninety-seven percent of their range are small headwater streams in the Great Basin of North America.

A USGS scientist holds an invasive brown treesnake.

USGS technicians at the USGS Gulf Coast #4 Bonham borehole in preparation for geophysical logging of the Austin Chalk Group and the Eagle Ford Group mudstones, Fannin County, Texas.

Bedding features in the core from the USGS Gulf Coast #4 Bonham borehole, in the Eagle Ford Group mudstones from a depth of about 401 feet, Fannin County, Texas. The Eagle Ford Group lies underneath the Austin Chalk and serves as the source rock for much of the Austin Chalk's petroleum.

Looking upstream on the San Miguel River in Colorado in fall 2020 when baseflow (groundwater flowing to streams) is the primary contributor to streamflow.

Researchers instruct volunteers on how to collect dragonfly larvae in Glacier NP as a part of the Dragonfly Mercury Project.

3D geologic framework model from west-central New Mexico; graphic shows stratigraphic units in the model being sequentially removed to reveal the deeper units. Faults used in the model appear as vertical “ribbons” as geologic layers are removed.

Map showing ice cover in the Yellowstone region. Light shaded areas bounded by black and red lines indicate areas covered during the Pinedale (about 20,000-15,000 years ago) and Bull Lake (about 150,000 years ago) glaciations, respectively. Blue lines are contours in thousands of feet on the maximum reconstructed Pinedale glacier surface.

Rhyolite lavas in the Yellowstone Caldera younger than 631,000 years

Tyson Hatch and Fletcher Brinkerhoff sampling suspended-sediment concentration upstream of the Buckman Diversion for the city of Santa Fe on the Rio Grande (08313150 Rio Grande above Buckman Diversion, near White Rock, NM)

Photograph taken for a USGS project to collect imagery, topographic, and bathymetric data and sources of water and salts of Zuni Salt Lake in west-central New Mexico, 2019.

RAMPS expands drought adaptation project with national parks in the 4-Corners area. National parks across the desert Southwest are experiencing ecological impacts due to climate change.

Photomicrographs from a Great-Horned Owl showing (A) moderate acute hemorrhage in the right atrial epicardium extending into the myocardium and (B) a focally extensive area of coagulative necrosis of the epidermis and dermis (arrow) consistent with an electrical burn.

RAMPS met with DOI Office of Wildland Fire, US Customs and Border Patrol, and US Fish & Wildlife Service staff at Buenos Aires National Wildlife Refuge in southern AZ last November. The group is developing tools to reduce wildfire risk, conserve wildlife habitat and natural resources, and increase safety and security of border operations.

The USGS and partners study the effects of climate change on the Greater Yellowstone Ecosystem. This sunset image was taken from Steamboat Lake, Wind River Indian Reservation, Wind River Range, Wyoming.

Colorado River with yellow flowers in the foreground and steep canyon walls with visible stratigraphy.

The USGS and partners study the effects of climate change on the Greater Yellowstone Ecosystem. This image shows a research raft on Spider Lake, Wind River Indian Reservation, Wind River Range, Wyoming.

Photo of Kate Wilkins, Hydrologic Technician, floating the Rio Grande in July 2019 during a preliminary sampling trip

Sealing MBARI Environmental Sample Processor into its housing

Sampling Big Sandy River below Farson, WY