Florence Bascom Geoscience Center

Publications

Filter Total Items: 388
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Year Published: 2017

The 3.6 ka Aniakchak tephra in the Arctic Ocean: A constraint on the Holocene radiocarbon reservoir age in the Chukchi Sea

The caldera-forming eruption of the Aniakchak volcano in the Aleutian Range on the Alaskan Peninsula at 3.6 cal kyr BP was one of the largest Holocene eruptions worldwide. The resulting ash is found as a visible sediment layer in several Alaskan sites and as a cryptotephra on Newfoundland and Greenland. This large geographic distribution, combined...

Pearce, Christof; Varhelyi, Aron; Wastegård, Stefan; Muschitiello, Francesco; Barrientos Macho, Natalia; O'Regan, Matt; Cronin, Thomas M.; Gemery, Laura; Semiletov, Igor; Backman, Jan; Jakobsson, Martin
Pearce, C., Varhelyi, A., Wastegård, S., Muschitiello, F., Barrientos, N., O'Regan, M., Cronin, T. M., Gemery, L., Semiletov, I., Backman, J., and Jakobsson, M.: The 3.6 ka Aniakchak tephra in the Arctic Ocean: a constraint on the Holocene radiocarbon reservoir age in the Chukchi Sea, Clim. Past, 13, 303-316, 2017.

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Year Published: 2017

Creating high-resolution bare-earth digital elevation models (DEMs) from stereo imagery in an area of densely vegetated deciduous forest using combinations of procedures designed for lidar point cloud filtering

For areas of the world that do not have access to lidar, fine-scale digital elevation models (DEMs) can be photogrammetrically created using globally available high-spatial resolution stereo satellite imagery. The resultant DEM is best termed a digital surface model (DSM) because it includes heights of surface features. In densely vegetated...

DeWitt, Jessica D.; Warner, Timothy A.; Chirico, Peter G.; Bergstresser, Sarah E.
Jessica D. DeWitt, Timothy A. Warner, Peter G. Chirico & Sarah E.Bergstresser (2017) Creating high-resolution bare-earth digital elevation models (DEMs) fromstereo imagery in an area of densely vegetated deciduous forest using combinations of proceduresdesigned for lidar point cloud filtering, GIScience & Remote Sensing, 54:4, 552-572

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Year Published: 2017

Extended late Holocene relative sea-level histories for North Carolina, USA

We produced ∼3000-year long relative sea-level (RSL) histories for two sites in North Carolina (USA) using foraminifera preserved in new and existing cores of dated salt-marsh sediment. At Cedar Island, RSL rose by ∼2.4 m during the past ∼3000 years compared to ∼3.3 m at Roanoke Island. This spatial difference arises primarily from...

Kemp, Andrew C.; Kegel, Jessica J.; Culver, Stephen J.; Barber, Donald C.; Mallinson, David J.; Leorri, Eduardo; Bernhardt, Christopher E.; Cahill, Niamh; Riggs, Stanley R.; Woodson, Anna L.; Mulligan, Ryan P.; Horton, Benjamin P.
Kemp A.C., Kegel J.J., Culver S.J., Barber D.C., Mallinson D.J., Leorri E., Bernhardt C.E., Cahill N., Riggs S.R., Woodson A.L., Mulligan R.P., Horton B.P. Extended late Holocene relative sea-level histories for North Carolina, USA Quaternary Science Reviews, Volume 160, p. 13-30.

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Year Published: 2017

Rapid carbon loss and slow recovery following permafrost thaw in boreal peatlands

Permafrost peatlands store one-third of the total carbon (C) in the atmosphere and are increasingly vulnerable to thaw as high-latitude temperatures warm. Large uncertainties remain about C dynamics following permafrost thaw in boreal peatlands. We used a chronosequence approach to measure C stocks in forested permafrost plateaus (forest) and...

Jones, Miriam C.; Harden, Jennifer W.; O'Donnell, Jonathan A.; Manies, Kristen L.; Jorgenson, Torre; Treat, Claire C.; Ewing, Stephanie

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Year Published: 2017

Reply to: Terry, J. and Goff, J. comment on “Late Cenozoic sea level and the rise of modern rimmed atolls” by Toomey et al. (2016), Palaeogeography, Palaeoclimatology, Palaeoecology 4 51: 73–83.

We appreciate Terry and Goff's thoughtful comment in response to our proposed atoll development model. Flank collapse of reef-built slopes likely does affect plan-form atoll morphology in some locations and potentially poses a tsunami hazard to low-lying Pacific islands (Terry and Goff, 2013). However, given the often rapid rates of lagoon infill...

Toomey, Michael; Ashton, Andrew; Raymo, Maureen E.; Perron, J. Taylor
Michael R. Toomey, Andrew D. Ashton, Maureen E. Raymo, J. Taylor Perron, Reply to: Terry, J. and Goff, J. comment on “Late Cenozoic sea level and the rise of modern rimmed atolls” by Toomey et al. (2016), Palaeogeography, Palaeoclimatology, Palaeoecology 4 51: 73–83., Palaeogeography, Palaeoclimatology, Palaeoecology, Volume 469, 1 March 2017, Pages 159-160, ISSN 0031-0182

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Year Published: 2017

Book review: Karst without boundaries

No abstract available.

Doctor, Daniel H.
Doctor, D.H., 2016, Karst without boundaries, Groundwater, Vol.54, Issue 6, pp.6-7,

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Year Published: 2017

Confirmation of the southwest continuation of the Cat Square terrane, southern Appalachian Inner Piedmont, with implications for middle Paleozoic collisional orogenesis

Detailed geologic mapping, U-Pb zircon geochronology and whole-rock geochemical analyses were conducted to test the hypothesis that the southwestern extent of the Cat Square terrane continues from the northern Inner Piedmont (western Carolinas) into central Georgia. Geologic mapping revealed the Jackson Lake fault, a ∼15 m-thick, steeply dipping...

Huebner, Matthew T.; Hatcher, Robert D.; Merschat, Arthur J.
Huebner, M.T., Hatcher, R.D., Jr., and Merschat, A.J., 2017, Confirmation of the southwest continuation of the Cat Square terrane, southern Appalachian Inner Piedmont, with implications for middle Paleozoic collisional orogenesis: American Journal of Science, v. 317, p. 95-176.

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Year Published: 2017

Quaternary displacement rates on the Meeman‐Shelby fault and Joiner ridge horst, eastern Arkansas: Results from coring Mississippi River alluvium

This research used coring and optically stimulated luminescence (OSL) dating of displaced, deeply buried Quaternary alluvium to determine vertical displacement rates for the Meeman‐Shelby fault and the Joiner ridge horst, two structures in northeastern Arkansas that have no modern seismicity associated with them. We drilled continuous cores of the...

Ward, Alex; Counts, Ronald C.; Van Arsdale, Roy; Larsen, Daniel; Mahan, Shannon A.
Alex Ward, Ronald Counts, Roy Van Arsdale, Daniel Larsen, and Shannon Mahan Quaternary Displacement Rates on the Meeman-Shelby Fault and Joiner Ridge Horst, Eastern Arkansas: Results from Coring Mississippi River Alluvium Seismological Research Letters Volume 88, Number 2A March/April 2017, p. 442-455.

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Year Published: 2017

Geology along the Blue Ridge Parkway in Virginia

Detailed geologic mapping and new SHRIMP (sensitive high-resolution ion microprobe) U-Pb zircon, Ar/Ar, Lu-Hf, 14C, luminescence (optically stimulated), thermochronology (fission-track), and palynology reveal the complex Mesoproterozoic to Quaternary geology along the ~350 km length of the Blue Ridge Parkway in Virginia. Traversing the...

Carter, Mark W.; Southworth, C. Scott; Tollo, Richard P.; Merschat, Arthur J.; Wagner, Sara; Lazor, Ava; Aleinikoff, John N.
Carter, M.W., Southworth, S., Tollo, R.P., Merschat, A.J., Wagner, S., Lazor, A., and Aleinikoff, J.N., 2017, Geology along the Blue Ridge Parkway in Virginia, in Bailey, C.M., and Jaye, S., eds., From the Blue Ridge to the Beach: Geological Field Excursions across Virginia: Geological Society of America Field Guide 47, p. 1–58, doi:10.1130/2017.0047(01).

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Year Published: 2017

Geology and biostratigraphy of the Potomac River cliffs at Stratford Hall, Westmoreland County, Virginia

The cliffs along the Potomac River at Stratford Hall display extensive exposures of Miocene marine strata that belong successively to the Calvert, Choptank, St. Marys, and Eastover Formations. Within the lower part of this sequence, in the Calvert and Choptank Formations, there is well-developed cyclic stratigraphy. Above the Miocene units lies...

Weems, Robert E.; Edwards, Lucy E.; Landacre, Bryan D.
Robert E. Weems, Lucy E. Edwards and Bryan Landacre Geology and biostratigraphy of the Potomac River cliffs at Stratford Hall, Westmoreland County, Virginia GSA Field Guides 2017, v. 47, p. 125-152

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Year Published: 2017

Geology of the Petersburg batholith, eastern Piedmont, Virginia

The 295-300 Ma Petersburg batholith in east-central Virginia forms one of the largest and northernmost of the Alleghanian plutonic complexes in the southern Appalachian Piedmont. The batholith is primarily composed of granite including massive and foliated (both magmatic and solid-state fabrics) varieties. The plutonic complex intruded medium-...

Owens, Brent E.; Carter, Mark W.; Bailey, Christopher M.
Owens, B.E., Carter, M., and Bailey, C.M., 2017, Geology of the Petersburg batholith, eastern Piedmont, Virginia, in Bailey, C.M., and Jaye, S., eds., From the Blue Ridge to the Beach: Geological Field Excursions across Virginia: Geological Society of America Field Guide 47, p. 153–162

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Year Published: 2017

Post-rift magmatic evolution of the eastern North American “passive-aggressive” margin

Understanding the evolution of passive margins requires knowledge of temporal and chemical constraints on magmatism following the transition from supercontinent to rifting, to post-rifting evolution. The Eastern North American Margin (ENAM) is an ideal study location as several magmatic pulses occurred in the 200 My following rifting. In...

Mazza, Sarah E.; Gazel, Esteban; Johnson, Elizabeth A.; Bizmis, Michael; McAleer, Ryan J.; Biryol, C. Berk
Mazza, S. E., E. Gazel, E. A. Johnson, M. Bizimis, R. McAleer, and C. B. Biryol (2017), Post-rift magmatic evolution of the eastern North American “passive-aggressive” margin, Geochem. Geophys. Geosyst., 18, 3–22