Sentences with phrase «calibrated radiocarbon dates»

Row (A) Calibrated radiocarbon dates with error bars; (B) macrofossil charcoal, an indication of local fires; (C — E) BC, char, and soot MARs; (F) char / soot ratio, an indicator of the relative contribution of smoldering and flaming combustion; (G — I) pollen percentages, proxies for paleoecological variation.

Utilizing newly - calibrated radiocarbon dates, the samples were divided into two groups representing the early LIP (AD 1150 - 1300) and the late LIP (AD 1300 - 1450).

Are the long tree - ring chronologies used to calibrate radiocarbon dates reliable?.

The earliest calibrated radiocarbon date was used as a prior estimate of the time to the most recent common ancestor for all island fox samples.

Not exact matches

(All dates in this story are in calibrated radiocarbon years.)

Radiocarbon dates were calibrated using the IntCal09 curve (40).

Continuous series of tree - ring dated wood samples have been obtained for roughly the past 10,000 years which give the approximate correct radiocarbon age, demonstrating the general validity of the conventional radiocarbon dating technique.Several long tree - ring chronologies have been constructed specifically for use in calibrating the radiocarbon time scale.Some may have mistaken this to mean that the sample had been dated to 20,000 radiocarbon years.The second characteristic of the measurement of radiocarbon is that it is easy to contaminate a sample which contains very little radiocarbon with enough radiocarbon from the research environment to give it an apparent radiocarbon age which is much less than its actual radiocarbon age.

calibrating practice Samples used for radiocarbon dating must be handled carefully to avoid contamination.

All ages derived from AMS radiocarbon dates are in calibrated calendar years (cal BP) unless otherwise noted (S1 Text and S3 Table).