Scholarly Work - Earth Sciences
Recent Submissions
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Paleoecological implications of two closely associated egg types from the Upper Cretaceous St. Mary River Formation, Montana
(2017-11)Two closely associated egg types occur at the same locality in the Upper Cretaceous (Maastrichtian) St. Mary River Formation in north central Montana. These specimens represent the first fossil eggs described from this ... -
A Geospatial Approach for Identifying and Exploring Potential NaturalWater Storage Sites
(2017-08)Across the globe, climate change is projected to affect the quantity, quality, and timing of freshwater availability. In western North America, there has been a shift toward earlier spring runoff and more winter precipitation ... -
Quantifying nutrient uptake as driver of rock weathering in forest ecosystems by magnesium stable isotopes
(2017-06)Plants and soil microbiota play an active role in rock weathering and potentially couple weathering at depth with erosion at the soil surface. The nature of this coupling is still unresolved because we lacked means to ... -
A new Late Cretaceous iguanomorph from North America and the origin of New World Pleurodonta (Squamata, Iguania)
(2017-01)Iguanomorpha (stem + crown Iguania) is a diverse squamate clade with members that predominate many modern American lizard ecosystems. However, the temporal and palaeobiogeographic origins of its constituent crown clades ... -
Live birth in an archosauromorph reptile
(2017-02)Live birth has evolved many times independently in vertebrates, such as mammals and diverse groups of lizards and snakes. However, live birth is unknown in the major clade Archosauromorpha, a group that first evolved some ... -
Pinus contorta invasions increase wildfire fuel loads and may create a positive feedback with fire
(2017-03)Invasive plant species that have the potential to alter fire regimes have significant impacts on native ecosystems. Concern that pine invasions in the Southern Hemisphere will increase fire activity and severity and ... -
A Laurentian record of the earliest fossil eukaryotes
(2017-05)The oldest evidence of eukaryotes in the fossil record comes from a recurrent assemblage of morphologically differentiated late Paleoproterozoic to early Mesoproterozoic microfossils. Although widely distributed, the ... -
Climate driven thresholds for chemical weathering in post-glacial soils of New Zealand
(2016-09)Chemical weathering in soils dissolves and alters minerals, mobilizes metals, liberates nutrients to terrestrial and aquatic ecosystems, and may modulate Earth's climate over geologic time scales. Climate-weathering ... -
Parent material and pedogenic thresholds: observations and a simple model
(2016-10)Pedogenic thresholds, where multiple soil properties vary substantially and coherently in a narrow portion of a broad environmental gradient, are well-described on basaltic soils in Hawaii. One such threshold occurs along ... -
Reproduction in Mesozoic birds and evolution of the modern avian reproductive mode
(2016-10)The reproductive biology of living birds differs dramatically from that of other extant vertebrates. Although some attributes of modern avian reproduction had their origin within theropod dinosaurs like oviraptors and ... -
An accumulation of turtle eggs with embryos from the Campanian (Upper Cretaceous) Judith River Formation of Montana
(2017-01)A weathered accumulation of turtle eggs, interpreted as remnants of a single clutch composed of at least 16 turtle eggs (MOR 710) from the Campanian (Upper Cretaceous) Judith River Formation of north-central Montana, USA, ... -
Approaches and mechanisms for ecologically based pest management across multiple scales
(2016-08)The past 50 years have seen substantial change of agroecosystems in the world, including an intensified use of agrochemicals and expansion of cropland, resulting in a rapid loss of biodiversity and a reduction of ecosystem ... -
Trust matters: Why augmenting water supplies via desalination may not overcome perceptual water scarcity
(2016-11-16)Historically, water scarcity has been understood to result from unfavorable climatological and hydrological factors. From this perspective, infrastructural solutions that augment water supplies, such as desalination, are ... -
Testing soil fertility of Prehispanic terraces at Viejo Sangayaico in the upper Ica catchment of south-central highland Peru
(Elsevier, 2016-07)This study presents a pilot geoarchaeological investigation of terraced agricultural systems near San Francisco de Sangayaico, in the upper Ica catchment of the Southern Peruvian Andes. It aims to assess the evidence for ... -
Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica
(2016-05)Subglacial Lake Whillans (SLW), West Antarctica, is an active component of the subglacial hydrological network located beneath 800 m of ice. The fill and drain behavior of SLW leads to long (years to decades) water residence ... -
Aerobic and Anaerobic Thiosulfate Oxidation by a Cold-Adapted, Subglacial Chemoautotroph
(2015-12)Geochemical data indicate that protons released during pyrite (FeS2) oxidation are important drivers of mineral weathering in oxic and anoxic zones of many aquatic environments including those beneath glaciers. Oxidation ... -
A new brachylophosaurin hadrosaur (Dinosauria: Ornithischia) with an intermediate nasal crest from the Campanian Judith River Formation of northcentral Montana
(2015-11)Background: Brachylophosaurini is a clade of hadrosaurine dinosaurs currently known from the Campanian (Late Cretaceous) of North America. Its members include: Acristavus gagslarsoni, which lacks a nasal crest; Brachylophosaurus ... -
Spatial Extended Column Test Results on Slopes Across Southwest Montana [dataset]
(Montana State University ScholarWorks, 2014-03)This dataset contains 23 files. Each file is a spatial dataset of Extended Column Test results. This data was collected during Ian Hoyer's thesis work across southwest Montana during the 2012-2013 and 2013-2014 winter ... -
Can the Adoption of Desalination Technology Lead to Aquifer Preservation? A Case Study of a Sociotechnical Water System in Baja California Sur, Mexico
(2015-09)There is growing concern about the sustainability of groundwater supplies worldwide. In many regions, desalination—the conversion of saline water to freshwater—is viewed as a way to increase water supplies and reduce ... -
Sedimentological Analyses of Eggshell Transport & Deposition: Implication and Application to Eggshell Taphonomy
(2015-06)The interpretation of fossil eggshells can be problematic because eggshells may be transported by hydraulic flow in floodplains, making it difficult to interpret the reproductive behavior and ecology of parent animals. A ...
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