Scholarly Works, Department of Geosciences
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Research articles, presentations, and other scholarship
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Geochemical records reveal protracted and differential marine redox change associated with Late Ordovician climate and mass extinctions
(2022-01-10)The Ordovician (Hirnantian; 445 Ma) hosts the second most severe mass extinction in Earth history, coinciding with Gondwanan glaciation and increased geochemical evidence for marine anoxia. It remains unclear whether ... -
Country-wide flood exposure analysis using Sentinel-1 synthetic aperture radar data: Case study of 2019 Iran flood
(2021-11-24)Extreme precipitation and flooding often lead to human and economic losses. However, the high-resolution nationwide flooding exposure data are scarce. Availability of all-weather space-borne SAR satellite data can potentially ... -
Changing impacts of Alaska-Aleutian subduction zone tsunamis in California under future sea-level rise
(Springer Nature, 2021-12-08)The amplification of coastal hazards such as distant-source tsunamis under future relative sea-level rise (RSLR) is poorly constrained. In southern California, the Alaska-Aleutian subduction zone has been identified as an ... -
Evaluating Models for Lithospheric Loss and Intraplate Volcanism Beneath the Central Appalachian Mountains
(2021-10)The eastern margin of North America has been shaped by a series of tectonic events including the Paleozoic Appalachian Orogeny and the breakup of Pangea during the Mesozoic. For the past similar to 200 Ma, eastern North ... -
Osteology and relationships of Revueltosaurus callenderi (Archosauria: Suchia) from the Upper Triassic (Norian) Chinle Formation of Petrified Forest National Park, Arizona, United States
(2021-09-29)Once known solely from dental material and thought to represent an early ornithischian dinosaur, the early-diverging pseudosuchian Revueltosaurus callenderi is described from a minimum of 12 skeletons from a monodominant ... -
Evidence for a change in Milankovitch forcing caused by extraterrestrial events at Massignano, Italy, Eocene-Oligocene boundary GSSP
(2009-04-01)High-resolution spectral analyses of four climate proxies from Massignano, Italy (Eocene-Oligocene boundary global stratotype section and point [GSSP]) indicate that the deposition of this rhythmically bedded sedimentary ... -
Localized management of non-indigenous animal domesticates in Northwestern China during the Bronze Age
(Springer, 2021-08-26)The movements of ancient crop and animal domesticates across prehistoric Eurasia are well-documented in the archaeological record. What is less well understood are the precise mechanisms that farmers and herders employed ... -
New sphenodontian (Reptilia: Lepidosauria) from a novel Late Triassic paleobiota in western North America sheds light on the earliest radiation of herbivorous lepidosaurs
(2021-07)Herbivory is a common ecological function among extant lepidosaurs, but little is known about the origin of this feeding strategy within Lepidosauria. Here we describe a sphenodontian (Lepidosauria) from the Late Triassic ... -
Biogenic formation of amorphous carbon by anaerobic methanotrophs and select methanogens
(AAAS, 2021-10-27)Elemental carbon exists in different structural forms including graphite, diamond, fullerenes, and amorphous carbon. In nature, these materials are produced through abiotic chemical processes under high temperature and ... -
Persistent impact of spring floods on crop loss in U.S. Midwest
(Elsevier, 2021-10-20)Climate extremes threaten global food security, and compound events, such as late spring heavy and warmer rainfall over snow and subsequent flooding, exacerbate this vulnerability. Despite frequent occurrences in recent ... -
Interpretation of Recent Unrest Events (Bradyseism) at Campi Flegrei, Napoli (Italy): Comparison of Models Based on Cyclical Hydrothermal Events versus Shallow Magmatic Intrusive Events
(Hindawi, 2021-10-14)Several recent models that have been put forth to explain bradyseism at Campi Flegrei (CF), Italy, are discussed. Data obtained during long-term monitoring of the CF volcanic district has led to the development of a model ... -
A new method for in situ structural investigations of nano-sized amorphous and crystalline materials using mixed-flow reactors
(International Union of Crystallography, 2019-09-01)Structural investigations of amorphous and nanocrystalline phases forming in solution are historically challenging. Few methods are capable of in situ atomic structural analysis and rigorous control of the system. A ... -
Tectonic Transport Directions, Shear Senses and Deformation Temperatures Indicated by Quartz c-Axis Fabrics and Microstructures in a NW-SE Transect across the Moine and Sgurr Beag Thrust Sheets, Caledonian Orogen of Northern Scotland
(MDPI, 2021-09-30)Moine metasedimentary rocks of northern Scotland are characterized by arcuate map patterns of mineral lineations that swing progressively clockwise from orogen-perpendicular E-trending lineations in greenschist facies ... -
Global marine redox changes drove the rise and fall of the Ediacara biota
(Wiley, 2019-07-28)The role of O2 in the evolution of early animals, as represented by some members of the Ediacara biota, has been heavily debated because current geochemical evidence paints a conflicting picture regarding global marine O2 ... -
Morphology: Too hip for two sacral vertebrae
(eLife, 2019-12-19)A complex pelvic morphology has been discovered in the fossils of one of the largest crocodylians. -
Cranial Musculoskeletal Description of Black-Throated Finch (Aves: Passeriformes: Estrildidae) with DiceCT
(Oxford University Press, 2021)Dietary requirements and acquisition strategies change throughout ontogeny across various clades of tetrapods, including birds. For example, birds hatch with combinations of various behavioral, physiological, and morphological ... -
Preferred orientations of garnet porphyroblasts reveal previously cryptic templating during nucleation
(Nature Research, 2021)Electron back scattered diffraction data of garnet crystals from the Nelson Aureole, British Columbia and the Mosher’s Island formation, Nova Scotia, reveals that 22 garnet crystals are all oriented with one of three crystal ... -
Including Distorted Specimens in Allometric Studies: Linear Mixed Models Account for Deformation
(Oxford Academic, 2021-05-18)Allometry—patterns of relative change in body parts—is a staple for examining how clades exhibit scaling patterns representative of evolutionary constraint on phenotype, or quantifying patterns of ontogenetic growth within ... -
A long-term record of early to mid-Paleozoic marine redox change
(AAAS, 2021-07-01)The extent to which Paleozoic oceans differed from Neoproterozoic oceans and the causal relationship between biological evolution and changing environmental conditions are heavily debated. Here, we report a nearly continuous ...
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