Publications
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Neoproterozoic tectonic evolution of the Jebel Saghro and Bou Azzer - El Graara inliers, eastern and central Anti-Atlas, Morocco Neoproterozoic tectonic evolution of the Jebel Saghro and Bou Azzer - El Graara inliers, eastern and central Anti-Atlas, Morocco
New mapping, geochemistry, and 17 U–Pb SHRIMP zircon ages from rocks of the Sirwa, Bou Azzer–El Graara, and Jebel Saghro inliers constrain the Neoproterozoic evolution of the eastern Anti-Atlas during Pan-African orogenesis. In the Sirwa inlier, Tonian quartzite from the pre Pan-African passive margin deposits of the Mimount Formation contains detrital zircon derived entirely from the...
Authors
Gregory J. Walsh, John N. Aleinikoff, Richard W. Harrison, William C. Burton, James E. Quick, Foudad Benziane, Abdelaziz Yazidi, Abderrahim Saadane
Biostratigraphy and chronostratigraphy of the Cambrian-Ordovician great American carbonate bank Biostratigraphy and chronostratigraphy of the Cambrian-Ordovician great American carbonate bank
The carbonate strata of the great American carbonate bank (GACB) have been subdivided and correlated with ever-increasing precision and accuracy during the past half century through use of the dominant organisms that evolved on the Laurentian platform through the Cambrian and the Ordovician. Trilobites and conodonts remain the primary groups used for this purpose, although brachiopods...
Authors
John F. Taylor, John E. Repetski, James D. Loch, Stephen A. Leslie
A transect across the basement massifs of the central Green Mountains, Vermont A transect across the basement massifs of the central Green Mountains, Vermont
No abstract available.
Authors
Gregory J. Walsh, Nicholas M. Ratcliffe, Michael J. Kunk
The role of backbarrier infilling in the formation of barrier island systems The role of backbarrier infilling in the formation of barrier island systems
Barrier islands develop through a variety of processes, including spit accretion, barrier elongation, and inlet filling. New geophysical and sedimentological data provide a means of documenting the presence of a paleoinlet within a barrier lithosome in the western Gulf of Maine, illuminating the process of backbarrier infilling and its effect on barrier and tidal inlet morphodynamics...
Authors
Christopher J. Hein, Duncan M. FitzGerald, Emily A. Carruthers, Byron D. Stone, Allen M. Gontz
Traverse of the major fault systems of the Taconian deformational front, the Vermont Valley and core of the Green Mountain massif, southern Vermont Traverse of the major fault systems of the Taconian deformational front, the Vermont Valley and core of the Green Mountain massif, southern Vermont
No abstract available.
Authors
Nicholas M. Ratcliffe, Michael J. Kunk, William C. Burton, Gregory J. Walsh
Was pre–twentieth century sea level stable? Was pre–twentieth century sea level stable?
Sea level rise (SLR) ranks high on the list of climate change issues because the expected acceleration from the current rate (about 3.1 millimeters per year) poses threats to coastal regions. Tide gauge, salt marsh, and archaeological records, and modeling of glacioisostatic adjustment (GIA) have led to the widely accepted idea that late Holocene (the past ∼2000 years) sea level was...
Authors
Thomas M. Cronin
Neither a year nor an annus can be a derived unit in the SI Neither a year nor an annus can be a derived unit in the SI
The year is not a unit of the SI. The only SI unit of measurement for time is the second. The word “annus” or “annum” does not appear anywhere in the current SI document. The word “year” is not in the table of “Non-SI units accepted for use with the International System of Units,” nor in the table of “Non-SI units whose values in SI units must be obtained experimentally,” nor even in the...
Authors
Lucy E. Edwards
Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan
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Authors
Robert D. Tucker, Harvey E. Belkin, Klaus J. Schulz, Stephen G. Peters, Kim P. Buttleman
The Holocene history of Nares Strait: Transition from glacial bay to Arctic-Atlantic throughflow The Holocene history of Nares Strait: Transition from glacial bay to Arctic-Atlantic throughflow
Retreat of glacier ice from Nares Strait and other straits in the Canadian Arctic Archipelago after the end of the last Ice Age initiated an important connection between the Arctic and the North Atlantic Oceans, allowing development of modern ocean circulation in Baffin Bay and the Labrador Sea. As low-salinity, nutrient-rich Arctic Water began to enter Baffin Bay, it contributed to the...
Authors
Anne E. Jennings, Christina Sheldon, Thomas M. Cronin, Pierre Francus, Joseph Stoner, John Andrews
Surficial geologic map of the Elizabethtown 30' x 60' quadrangle, North Carolina Surficial geologic map of the Elizabethtown 30' x 60' quadrangle, North Carolina
The Elizabethtown 30' x 60' quadrangle is located in southeastern North Carolina between Fayetteville and Wilmington. Most of the area is flat to gently rolling, although steep slopes occur locally along some of the larger streams. Total relief in the area is slightly over 210 feet (ft), with elevations ranging from slightly less than 10 ft above sea level along the Black River (east of...
Authors
Robert E. Weems, William C. Lewis, E. Allen Crider
Detailed sections from auger holes in the Elizabethtown 1:100,000-scale quadrangle, North Carolina Detailed sections from auger holes in the Elizabethtown 1:100,000-scale quadrangle, North Carolina
The Elizabethtown 1:100,000 quadrangle is in the west-central part of the Coastal Plain of southeastern North Carolina. The Coastal Plain, in this region, consists mostly of unlithified sediments that range in age from Late Cretaceous to Holocene. These sediments lie with profound unconformity on complexly deformed metamorphic and igneous rocks similar to rocks found immediately to the...
Authors
Robert E. Weems, William C. Lewis, Joseph H. Murray, David B. Queen, Jeffrey B. Grey, Benjamin D. DeJong
A loess–paleosol record of climate and glacial history over the past two glacial–interglacial cycles (~ 150 ka), southern Jackson Hole, Wyoming A loess–paleosol record of climate and glacial history over the past two glacial–interglacial cycles (~ 150 ka), southern Jackson Hole, Wyoming
Loess accumulated on a Bull Lake outwash terrace of Marine Oxygen Isotope Stage 6 (MIS 6) age in southern Jackson Hole, Wyoming. The 9 m section displays eight intervals of loess deposition (Loess 1 to Loess 8, oldest), each followed by soil development. Our age-depth model is constrained by thermoluminescence, meteoric 10Be accumulation in soils, and cosmogenic 10Be surface exposure...
Authors
Kenneth L. Pierce, Daniel R. Muhs, Maynard A. Fosberg, Shannon A. Mahan, Joseph G. Rosenbaum, Joseph M. Licciardi, Milan J. Pavich