William A. Thomas
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View article: Lower Mississippi River, Tarbert Landing to East Jetty Sedimentation Study: Numerical Model Investigation
Lower Mississippi River, Tarbert Landing to East Jetty Sedimentation Study: Numerical Model Investigation Open
A one-dimensional numerical model (TABS-1) of the Mississippi River between Tarbert Landing, at river mile 306, and East Jetty, at river mile -20, was developed. The model was used to evaluate long-term aggradation and degradation trends, …
View article: Photoreceptor disc incisures form as an adaptive mechanism ensuring the completion of disc enclosure
Photoreceptor disc incisures form as an adaptive mechanism ensuring the completion of disc enclosure Open
The first steps of vision take place within a stack of tightly packed disc-shaped membranes, or ‘discs’, located in the outer segment compartment of photoreceptor cells. In rod photoreceptors, discs are enclosed inside the outer segment an…
View article: Author response: Photoreceptor disc incisures form as an adaptive mechanism ensuring the completion of disc enclosure
Author response: Photoreceptor disc incisures form as an adaptive mechanism ensuring the completion of disc enclosure Open
Full text Figures and data Side by side Abstract Editor's evaluation Introduction Results Discussion Materials and methods Data availability References Decision letter Author response Article and author information Metrics Abstract The fir…
View article: Photoreceptor disc incisures form as an adaptive mechanism ensuring the completion of disc enclosure
Photoreceptor disc incisures form as an adaptive mechanism ensuring the completion of disc enclosure Open
The first steps of vision take place within a stack of tightly packed disc-shaped membranes, or “discs”, located in the outer segment compartment of photoreceptor cells. In rod photoreceptors, discs are enclosed inside the outer segment an…
View article: Red fish, blue fish, native fish, new fish: eDNA as a tool to monitor fish in estuarine systems
Red fish, blue fish, native fish, new fish: eDNA as a tool to monitor fish in estuarine systems Open
Environmental DNA (eDNA) is emerging as a potentially powerful tool to assess aquatic ecosystems, and to monitor fish assemblages. We conducted a pilot eDNA water sampling program at 5 Reserves within the National Estuarine Research Reserv…
View article: Reckoning with Enslavement
Reckoning with Enslavement Open
For over seventy years, the enslaved families of Prince George's County, Maryland, filed hundreds of suits for their freedom against a powerful circle of slaveholders, taking their cause all the way to the Supreme Court. In this excerpt fr…
View article: Detrital-zircon analyses, provenance, and late Paleozoic sediment dispersal in the context of tectonic evolution of the Ouachita orogen
Detrital-zircon analyses, provenance, and late Paleozoic sediment dispersal in the context of tectonic evolution of the Ouachita orogen Open
New analyses for U-Pb ages and εHft values, along with previously published U-Pb ages, from Mississippian–Permian sandstones in synorogenic clastic wedges of the Ouachita foreland and nearby intracratonic basins support new interpretations…
View article: Detrital zircons and sediment dispersal in the eastern Midcontinent of North America
Detrital zircons and sediment dispersal in the eastern Midcontinent of North America Open
Results of detrital-zircon analyses (U-Pb ages and initial Hf values, εHft) of Mississippian–Pennsylvanian sandstones in the Michigan, Illinois, and Forest City basins are remarkably similar to data for coeval sandstones in the Appalachian…
View article: Supplemental Material: Detrital zircons and sediment dispersal from the Coahuila terrane of northern Mexico into the Marathon foreland of the southern Midcontinent
Supplemental Material: Detrital zircons and sediment dispersal from the Coahuila terrane of northern Mexico into the Marathon foreland of the southern Midcontinent Open
Geosphere, August 2019, v. 15, no. 4, 1102–1127, doi:10.1130/GES02033.1, Supplemental Table S1. U-Pb geochronologic analyses, Marathon foreland.
Detrital zircons and sediment dispersal from the Coahuila terrane of northern Mexico into the Marathon foreland of the southern Midcontinent Open
New analyses of U-Pb ages along with previously published analyses of detrital zircons from sandstones in the foreland of the Marathon orogen in west Texas have significant implications regarding provenance. The most prominent concentratio…
View article: Necessary Conditions for Intraplate Seismic Zones in North America
Necessary Conditions for Intraplate Seismic Zones in North America Open
The cause of intraplate seismic zones persists as an important scientific and societal question. Most intraplate earthquakes are concentrated in specific seismic zones along or adjacent to large‐scale basement structures (e.g., rifts or su…
View article: Detrital zircons and sediment dispersal in the Appalachian foreland
Detrital zircons and sediment dispersal in the Appalachian foreland Open
Seven new detrital-zircon U-Pb age analyses along with a compilation of previously published data from Mississippian-Permian sandstones in the Appalachian foreland (total n = 3564) define the provenance of Alleghanian synorogenic clastic w…
View article: Medical Evaluation Board for Mental Health Condition: U.S. Army Officer Medical Evaluation Board Data by Branch and Component
Medical Evaluation Board for Mental Health Condition: U.S. Army Officer Medical Evaluation Board Data by Branch and Component Open
Frequency of Army Officer MEBs and/or MH-MEBs were variable and career field dependent; the underlying causes of these variations warrant further research. The use of the Electronic Disability Evaluation System database for the Integrated …
View article: Detrital zircons from crystalline rocks along the Southern Oklahoma fault system, Wichita and Arbuckle Mountains, USA
Detrital zircons from crystalline rocks along the Southern Oklahoma fault system, Wichita and Arbuckle Mountains, USA Open
Detrital zircons with ages of 535 ± 10 Ma in many North American Midcontinent sandstones are commonly attributed to sources in Cambrian synrift igneous rocks along the Southern Oklahoma fault system. New analyses are designed to test the c…
View article: Evaluation of bank erosion potential, Clifton, Arizona : numerical model investigation
Evaluation of bank erosion potential, Clifton, Arizona : numerical model investigation Open
A sediment impact assessment study was conducted to evaluate the potential for bank erosion adjacent to a proposed levee along the San Francisco River in Clifton, AZ. Degradation potential was evaluated using a one- dimensional numerical s…
View article: Supplemental material: Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane
Supplemental material: Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane Open
Geosphere, December 2015, v. 11, p. 1749-1769, doi:10.1130/GES01212.1, Supplemental File - Geochronologic methods and data.
View article: Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane
Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane Open
The Precordillera terrane in northwestern Argentina is interpreted to be an exotic (Laurentian) continental fragment that was accreted to western Gondwana during the Ordovician. One prominent manifestation of the subduction and collision p…