ABSTRACT Lumsdenite (IMA 2018–092), ideally NaCa3Mg2(As3+V4+2V5+10As5+6O51)·45H2O, is a rare new polyoxometalate mineral from the Packrat mine, Gateway district, Mesa County, Colorado, USA. Crystals of lumsdenite occur as blades up to 0.2 mm in length, commonly growing in sprays. The crystals are da

Abstract Mountains create and enhance their own clouds, which both scatter and absorb shortwave radiation from the sun and absorb and re‐emit land surface and atmospheric longwave radiation. However, the impacts of clouds on the surface radiation balance in high elevation snowy mountain terrain are

The 1922 Colorado River Compact ignored available science and overallocated the river’s water, a decision whose effects reverberate today. Now there’s an opportunity to get things right.

Comparison of arctic ground squirrel hemoglobin α-chain with the amino-terminal 25 residues of the marmot shows one amino acid difference at position 13, which is similar to that of other rodent α-chains.

When the editor-in-chief solicited historical perspective pieces based on old articles from The American Naturalist, the choice became easy because it let me focus on two 1970s articles that transformed the field I work in, realigned my own thinking, and showed me the direction of the next 30 years

Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsTom RosemeyerTom Rosemeyer is the owner of Red Mountain Exploration and has mined and collected minerals in the San Juan Mountains for the last twenty years.

Yellow-bellied marmots, Marmota flaviventer , are facultatively social and may form multigenerational societies, which are characterized by individuals sharing and defending space, possessing the ability to distinguish group members from outsiders and potentially persisting for many generations. I r

The persistence of quaking aspen (Populus tremuloides Michx.) is of significant importance to land managers in the Rocky Mountain region. Fire suppression in the past century has been im- plicated as a mechanism influencing aspen population dynamics, as aspen are generally consi- dered an early sera

Detailed topographic map evidence and a new Cenozoic geologic and glacial history paradigm are used to determine the previously unexplained Yampa River-Colorado River drainage divide origin. The Yampa River now flows in a north direction away from the Colorado River (between the Park Range to the ea

Abstract Atmospheric nitrogen (N) deposition is driving changes in plant assemblages worldwide, but animal responses are not well understood, especially in relation to current widespread rates of low-level N deposition. Big sagebrush (Artemisia tridentata) is a foundation species in steppe ecosystem

Abstract The Colorado River, the largest river system in the western United States stretches from the headwaters in Rocky Mountain National Park in Colorado to Mexico. This mighty river evokes strong feelings and images to many people. Rich in history, it offers a haven for outdoor enthusiasts as we

AbstractThe North Fork of Clear Creek (NFCC), Colorado, is an acid‐mine‐drainage‐impacted stream typical of many mountain surface waters affected by historic metal mining in the western United States. The stream is devoid of fish primarily because of high metal concentrations in the water (e.g., cop