Results 141 to 150 of about 69,654 (263)

Late Holocene moisture variability in Arctic Alaska from chitin δ18O

Boreas, EarlyView.
Amplified warming in the Arctic has resulted in reduced sea‐ice extent, which can impact regional climate dynamics. Elucidating past moisture variability in response to changing temperatures and sea‐ice conditions can offer insight into how anthropogenic climate change may impact Arctic areas such as the Alaskan North Slope in the future. We contribute
Briana A. Edgerton, Melissa L. Chipman
wiley   +1 more source

Constructing deposition chronologies for peat deposits using radiocarbon dating [PDF]

Mires and Peat, 2011
Radiocarbon dating is one of the main methods used to establish peat chronologies. This article reviews the basis of the method and its application to dating of peat deposits.
N. Piotrowska, M. Blaauw, D. Mauquoy, F.M. Chambers   +3 more
doaj  

Droughts and human impact in the ancient Uaymil region of the Maya lowlands inferred from a 2800‐year sedimentary archive at Lake Kaná, Mexico

Boreas, EarlyView.
The relationship between the climate and societal transformation in Maya lowlands has long been debated, particularly the role of drought in shaping the civilization trajectory during the Classic Period. A high‐resolution, multi‐proxy, geochemical record from Lake Kaná, located in the underexplored Uaymil region of the Yucatán Peninsula in Mexico ...
Haydar B. Martinez‐Dyrzo, Priyadarsi D. Roy, Benjamin Gwinneth, Irma G. Vargas‐Martinez, Alejandro A. Aragon‐Moreno, Roger Medina‐Gonzales   +5 more
wiley   +1 more source

Bomb radiocarbon determines absolute age of adult fin whales, and validates use of earplug growth bands for age determination

Frontiers in Marine Science
Baleen whales are one of the few vertebrate taxa for which there are no confirmed estimates of longevity or methods of age determination. Lamina counts in the waxy earplug are assumed to represent age, but ageing accuracy is completely unknown.
Steven E. Campana, Sigríður Vala Finnsdóttir, Guðjón Már Sigurðsson   +2 more
doaj   +1 more source

Thorncliffe Formation: A proglacial to subglacial lacustrine basin sequence, Greater Toronto Region, Canada

Boreas, EarlyView.
Map of Lower sediment (LS) thickness is a surrogate for the distribution of Thorncliffe Formation (TF) and ~75% of TF thickness from the slope of Niagara Escarpment east to Brighton. Inset images show the LS sequence at the Don Valleys brickyards (DVBY) and undeformed TF sand and gravel (~15 m) below Newmarket Till (NT) at sites L and Co.
David R. Sharpe, Charles E. Logan, Ross D. Knight, Andre J.‐M. Pugin   +3 more
wiley   +1 more source

Luminescence dating of coastal deposits from the Chanthaburi Plain, Thailand

Boreas, EarlyView.
The ongoing global sea‐level rise urges us to better understand the dynamics of coastal processes for predicting future changes. Sedimentary deposits reflect past coastal environments but require precise chronological data to place evidence into a temporal context.
Margarita Nuss, Sakonvan Chawchai, Savanna Kager, Smith Leknettip, Yunyi Li, Kannika Wangritthikraikul, Frank Preusser   +6 more
wiley   +1 more source

Reservoirs and radiocarbon: ¹⁴C dating problems in Myvatnssveit, Northern Iceland [PDF]

, 2007
This paper examines 2 potential sources of the radiocarbon offset between human and terrestrial mammal (horse) bones recovered from Norse (~AD 870–1000) pagan graves in Mývatnssveit, north Iceland.
Ascough, P.L., Church, M.J., Cook, G.T., Dugmore, A.J., Dunbar, E., Einarsson, E., Frioriksson, A., Gestsdottir, H., McGovern, T.G.   +8 more
core  

Radiocarbon dating coming of age [PDF]

Proceedings of 50th International Winter Meeting on Nuclear Physics — PoS(Bormio2012), 2012
openaire   +2 more sources

Imaging Point Source Groundwater Discharges in a Confined Coastal Aquifer Using Electrical Resistivity

Groundwater, EarlyView.
Marine electrical resistivity tomography (ERT) is applied to characterize point‐source submarine groundwater discharge (PSGD) along NW Yucatán. ERT observations and forward modeling constrain conduit detectability under varying hydrogeological conditions.
Mariana Gómez‐Nicolás, Armando Huitzilt‐Rodriguez, Enrique Iñiguez, Roger Pacheco‐Castro, Marco Pérez‐Flores, Paulo Salles, Fiona Whitaker   +6 more
wiley   +1 more source

New Radiocarbon Dates from Four East Texas Caddo Sites [PDF]

, 2016
The East Texas Radiocarbon Database is an important and relatively new database concerning one key aspect of the archaeological record of the Caddo peoples that lived in East Texas from as early as ca. A.D. 800/850.
Perttula, Timothy K.
core   +1 more source