Florence Bascom Geoscience Center

Publications

Filter Total Items: 548
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Year Published: 2017

Surficial geologic map of Berrien County, Michigan, and the adjacent offshore area of Lake Michigan

The surficial geologic map of Berrien County, southwestern Michigan (sheet 1), shows the distribution of glacial and postglacial deposits at the land surface and in the adjacent offshore area of Lake Michigan. The geologic map differentiates surficial materials of Quaternary age on the basis of their lithologic characteristics, stratigraphic...

Stone, Byron D.; Kincare, Kevin A.; O'Leary, Dennis W.; Newell, Wayne L.; Taylor, Emily M.; Williams, Van S.; Lundstrom, Scott C.; Abraham, Jared E.; Powers, Michael H.
Stone, B.D., Kincare, K.A., O'Leary, D.W., Newell, W.L., Taylor, E.M., Williams, V.S., Lundstrom, S.C., Abraham, J.E., and Powers, M.H., 2017, Surficial geologic map of Berrien County, Michigan, and the adjacent offshore area of Lake Michigan: U.S. Geological Survey Scientific Investigations Map 3383, 2 sheets, scale 1:50,000, and 49-p. pamphlet, https://doi.org/10.3133/sim3383.

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Year Published: 2017

Enhanced Arctic amplification began at the Mid-Brunhes Event 430,000 years ago

Arctic Ocean temperatures influence ecosystems, sea ice, species diversity, biogeochemical cycling, seafloor methane stability, deep-sea circulation, and CO2 cycling. Today's Arctic Ocean and surrounding regions are undergoing climatic changes often attributed to "Arctic amplification" - that is, amplified warming in Arctic regions due to sea...

Cronin, Thomas M.; Dwyer, Gary S.; Caverly, Emma; Farmer, Jesse; DeNinno, Lauren H.; Rodriguez-Lazaro, Julio; Gemery, Laura

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Year Published: 2017

Multi-scale 46-year remote sensing change detection of diamond mining and land cover in a conflict and post-conflict setting

The town of Tortiya was created in the rural northern region of Côte d′Ivoire in the late 1940s to house workers for a new diamond mine. Nearly three decades later, the closure of the industrial-scale diamond mine in 1975 did not diminish the importance of diamond profits to the region's economy, and resulted in the growth of artisanal and small-...

Dewitt, Jessica D.; Chirico, Peter G.; Bergstresser, Sarah E.; Warner, Timothy A.
DeWitt, Jessica D., Chirico, Peter G., Bergstresser, Sarah E., and Timothy A. Warner, 2017, Multi-scale 46-year remote sensing change detection of diamond mining and land cover in a conflict and post-conflict setting, Remote Sensing Applications: Society and Environment, 8, 126-139.

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Year Published: 2017

Central Arctic Ocean paleoceanography from  ∼50 ka to present, on the basis of ostracode faunal assemblages from the SWERUS 2014 expedition

Late Quaternary paleoceanographic changes at the Lomonosov Ridge, central Arctic Ocean, were reconstructed from a multicore and gravity core recovered during the 2014 SWERUS-C3 Expedition. Ostracode assemblages dated by accelerator mass spectrometry (AMS) indicate changing sea-ice conditions and warm Atlantic Water (AW)inflow to the Arctic Ocean...

Gemery, Laura; Cronin, Thomas M.; Poirier, Robert K.; Pearce, Christof; Barrientos, Natalia; O'Regan, Matt; Johansson, Carina; Koshurnikov, Andrey; Jakobsson, Martin
Gemery, L., Cronin, T. M., Poirier, R. K., Pearce, C., Barrientos, N., O’Regan, M., … Jakobsson, M. (2017). Central Arctic Ocean paleoceanography from ~ 50 ka to present, on the basis of ostracode faunal assemblages from SWERUS 2014 expedition. Climate of the Past Discussions, 1–28.

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Year Published: 2017

Increased hurricane frequency near Florida during Younger Dryas Atlantic Meridional Overturning Circulation slowdown

The risk posed by intensification of North Atlantic hurricane activity remains controversial, in part due to a lack of available storm proxy records that extend beyond the relatively stable climates of the late Holocene. Here we present a record of storm-triggered turbidite deposition offshore the Dry Tortugas, south Florida, USA, that spans...

Toomey, Michael; Korty, Robert L.; Donnelly, Jeffrey P.; van Hengstum, Peter J.; Curry, William B.
Michael R. Toomey, Robert L. Korty, Jeffrey P. Donnelly, Peter J. van Hengstum, William B. Curry; Increased hurricane frequency near Florida during Younger Dryas Atlantic Meridional Overturning Circulation slowdown. Geology ; 45 (11): 1047–1050. doi: https://doi.org/10.1130/G39270.1

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Year Published: 2017

Rapid exhumation of Cretaceous arc-rocks along the Blue Mountains restraining bend of the Enriquillo-Plantain Garden fault, Jamaica, using thermochronometry from multiple closure systems

The effect of rapid erosion on kinematic partitioning along transpressional plate margins is not well understood, particularly in highly erosive climates. The Blue Mountains restraining bend (BMRB) of eastern Jamaica, bound to the south by the left-lateral Enriquillo-Plantain Garden fault (EPGF), offers an opportunity to test the effects of highly...

Cochran, William J.; Spotila, James A.; Prince, Philip S.; McAleer, Ryan J.
Cochran, W. J., Spotila, J. A., Prince, P.S., and McAleer R.J., 2017, Rapid exhumation of Cretaceous arc-rocks along the Blue Mountains restraining bend of the Enriquillo-Plantain Garden fault, Jamaica, using thermochronometry from multiple closure systems, Tectonophysics, https://doi.org/10.1016/j.tecto.2017.09.021;

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Year Published: 2017

Deglacial sea level history of the East Siberian Sea and Chukchi Sea margins

Deglacial (12.8–10.7 ka) sea level history on the East Siberian continental shelf and upper continental slope was reconstructed using new geophysical records and sediment cores taken during Leg 2 of the 2014 SWERUS-C3 expedition. The focus of this study is two cores from Herald Canyon, piston core SWERUS-L2-4-PC1 (4-PC1) and multicore SWERUS-L2-4-...

Cronin, Thomas M.; O'Regan, Matt; Pearce, Christof; Gemery, Laura; Toomey, Michael; Semiletov, Igor
Cronin, T. M., O'Regan, M., Pearce, C., Gemery, L., Toomey, M., Semiletov, I., and Jakobsson, M.: Deglacial sea-level history of the East Siberian Sea Margin, Clim. Past Discuss.,in review, 2017.

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Year Published: 2017

Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus

Biostratigraphic and morphometric analyses of calcareous nannofossil assemblages from one outcrop and two cored sections of lower Eocene sediments reveal the presence of two new species: Tribrachiatus lunatus sp. nov., and Tribrachiatus absidatus sp. nov. Differences between the new species and Tribrachiatus orthostylus are discussed. The first...

Self-Trail, Jean M.; Seefelt, Ellen L.; Shepherd, Claire L.; Martin, Victoria A.
Self-Trail, J.M., Seefelt, E.L., Shepherd, C. L., and Martin, V.A., 2017. Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus: Journal of Nannoplankton Research, v. 37 (2-3), p. 177-188.

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Year Published: 2017

Geologic map of the Dusar area, Herat Province, Afghanistan; Modified from the 1973 original map compilations of V.I. Tarasenko and others

The geologic maps and cross sections presented in this report are redrafted and modified versions of the Geologic map and map of useful minerals of the Dusar area (scale 1:50,000) and Geologic sketch map of the Dusar and Namak-sory ore occurrences (scale 1:10,000), located in the Herat Province, Afghanistan. The original maps and cross sections...

Tucker, Robert D.; Stettner, Will R.; Masonic, Linda M.; Bogdanow, Anya K.
Tucker, R.D., Stettner, W.R., Masonic, L.M., and Bogdanow, A.K., comps., 2017, Geologic map of the Dusar area, Herat Province, Afghanistan; Modified from the 1973 original map compilations of V.I. Tarasenko and others: U.S. Geological Survey Open-File Report 2017–1126, 1 sheet, scales 1:50,000 and 1:10,000, https://doi.org/10.3133/ofr20171126.

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Year Published: 2017

Application of paleoecology to ecosystem restoration: A case study from south Florida’s estuaries

Paleoecological analyses of biotic assemblages from cores collected throughout south Florida’s estuaries indicate gradually increasing salinities over approximately the last 2000 years, consistent with rising sea level. Around the beginning of the twentieth century these gradual patterns of change began to shift, corresponding to the beginning of...

Weckström, Kaarina; Saunders, Krystyna M.; Gell, Peter A.; Skilbeck, C. Gregory; Wingard, G. Lynn

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Year Published: 2017

A transect through Vermont’s most famous volcano – Mount Ascutney: GSNH Summer 2017 Field Trip

No abstract available.

Walsh, Gregory
Walsh, G.J., 2017, A transect through Vermont’s most famous volcano – Mount Ascutney: Geological Survey of New Hampshire, Granite State Geologist, September 2017, no. 98, 4 p.,http://www.gsnh.org/uploads/9/2/8/6/92861090/gsnh_mnt_ascutney_summer_2017_field_trip_guidebook.pdf

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Year Published: 2017

Hypogene caves of the central Appalachian Shenandoah Valley in Virginia

Several caves in the Shenandoah Valley in Virginia show evidence for early hypogenic conduit development with later-enhanced solution under partly confined phreatic conditions guided by geologic structures. Many (but not all) of these caves have been subsequently invaded by surface waters as a result of erosion and exhumation. Those not so...

Doctor, Daniel H.; Orndorff, Wil
Doctor, D.H. and Orndorff, W. (2017) Hypogene Caves of the Central Appalachian Shenandoah Valley in Virginia, in: Klimchouk, A., Palmer, A., De Waele, J., Auler, A., and Audra, P., eds., Hypogene Karst Regions and Caves of the World: New York, Springer, ISBN: 978-319-53347-6, doi: 10.1007/978-3-319-53348-3