Results 21 to 30 of about 14,612,070 (286)

Updated chronologies for North American small mammal fossil localities in the Neotoma Paleoecology Database [PDF]

Scientific Data
Community paleoecology is a powerful approach for analyzing ecological communities during long-term climate shifts like the Pleistocene-Holocene transition, but it depends on accurate estimates of species co-occurrences. The Neotoma Paleoecology Database
Val J. P. Syverson, Simon J. Goring, Nicola Cullen, Marta A. Jarzyna, André M. Bellvé, Andrew Martindale, Jessica L. Blois   +6 more
doaj   +2 more sources

IntCal09 and Marine09 Radiocarbon Age Calibration Curves, 0–50,000 Years cal BP [PDF]

Radiocarbon: An International Journal of Cosmogenic Isotope Research, 2009
Author Posting. © Arizona Board of Regents on behalf of the University of Arizona, 2009. This article is posted here by permission of Dept. of Geosciences, University of Arizona for personal use, not for redistribution.
P. Reimer, M. G. L. Baillie, E. Bard, A. Bayliss, J. Beck, P. G. Blackwell, C. Ramsey, C. Buck, G. Burr, R. L. Edwards, M. Friedrich, P. Grootes, T. Guilderson, I. Hajdas, T. Heaton, A. G. Hogg, K. Hughen, K. Kaiser, B. Kromer, F. G. McCormac, S. W. Manning, R. Reimer, D. A. Richards, J. Southon, S. Talamo, J. van der Plicht, C. Weyhenmeyer   +26 more
semanticscholar   +2 more sources

A Computer Program for Radiocarbon Age Calibration [PDF]

Radiocarbon, 1986
The calibration curves and tables given in this issue of RADIOCARBON form a data base ideally suited for a computerized operation. The program listed below converts a radiocarbon age and its age error os (one standard deviation) into calibrated ages (intercepts with the calibration curve), and ranges of calibrated ages that correspond to the age error.
Minze Stuiver, Paula J Reimer
openaire   +2 more sources

Late Quaternary sedimentological and climate changes at Lake Bosumtwi Ghana: New constraints from laminae analysis and radiocarbon age modeling

Palaeogeography, Palaeoclimatology, Palaeoecology, 2012
The Lake Bosumtwi sediment record represents one of the longest and highest-resolution terrestrial records of paleoclimate change available from sub-Saharan Africa.
Jeffrey Pigati, Timothy Shanahan, Jonathan Overpeck   +2 more
exaly   +2 more sources

A Radiocarbon Age Calculation Program for Windows [PDF]

Radiocarbon, 2002
The management of counting files, the calculation of radiocarbon age, and the creation and maintenance of databases for storage and retrieval of laboratory data are time-consuming and exacting tasks. These routine functions are essential to the successful operation of all 14C dating laboratories.
D Gallagher, E J McGee, P I Mitchell
openaire   +2 more sources

Can We Get a Good Radiocarbon Age from “Bad Bone”? Determining the Reliability of Radiocarbon Age from Bioapatite [PDF]

Radiocarbon, 2009
The study of the radiocarbon age of bone bioapatite was initiated by necessity to date archaeological artifacts, which often contain little or no collagen as a result of poor preservation. Contamination of the organic fraction in the process of the burial or during museum preservation treatment generally prohibits the use of the collagen fraction for ...
Cherkinsky, Alexander
openaire   +2 more sources

Radiocarbon age profiles and size dependency of mixing in Northeast Atlantic sediments [PDF]

, 2001
In recent years, the most common technique for radiocarbon dating of deep-ocean sediments has been accelerator mass spectrometry (AMS) analysis of hand-picked planktonic foraminifera (forams).
MacKenzie, A.B., Cook, G.T., Brown, L., Thomson, J.   +3 more
core   +9 more sources

INTCAL98 Radiocarbon Age Calibration, 24,000–0 cal BP

Radiocarbon: An International Journal of Cosmogenic Isotope Research, 1998
The focus of this paper is the conversion of radiocarbon ages to calibrated (cal) ages for the interval 24,000-0 cal BP (Before Present, 0 cal BP = AD 1950), based upon a sample set of dendrochronologically dated tree rings, uranium-thorium dated corals,
M. Stuiver, P. Reimer, E. Bard, J. Beck, G. Burr, K. Hughen, B. Kromer, G. McCormac, J. Vanderplicht, Marco Spurk   +9 more
semanticscholar   +2 more sources

Data on Holocene Fossil Benthic Foraminifera from Sunda Shelf, Offshore Southeastern Peninsular Malaysia

Open Quaternary, 2021
This paper documents a database of fossil foraminiferal occurrences from a core sample (2 m) retrieved from offshore southeastern Peninsular Malaysia, in 1993, with additional data on their modern distribution from published source. Five sub-samples were
Rokiah Suriadi, Hasrizal Shaari, Suhaimi Suratman, Abdullah Sulaiman   +3 more
doaj   +1 more source

A RESPONSE TO COMMUNITY QUESTIONS ON THE MARINE20 RADIOCARBON AGE CALIBRATION CURVE: MARINE RESERVOIR AGES AND THE CALIBRATION OF 14C SAMPLES FROM THE OCEANS

Radiocarbon: An International Journal of Cosmogenic Isotope Research, 2022
Radiocarbon (14C) concentrations in the oceans are different from those in the atmosphere. Understanding these ocean-atmospheric 14C differences is important both to estimate the calendar ages of samples which obtained their 14C in the marine environment,
T. Heaton, E. Bard, C. Ramsey, M. Butzin, C. Hatté, K. Hughen, P. Köhler, P. Reimer   +7 more
semanticscholar   +1 more source