The majority of these are either in correct stratigraphic order or, where this is not the case, within the 2 range of adjacent dates.Regardless, groups of between five and six consecutive (with respect to depth) radiocarbon ages define consistent linear sedimentation rates with a high degree of confidence ( 0.9) for the late Holocene and part of the LGIT period.The problem of insufficient age-control limits the utilisation of the 8.2 ka BP event for modelling freshwater forcing in climate change studies.
As part of a wider paleoclimate and paleoceanographic study of Holocene–upper Pleistocene laminated sediments from the eastern equatorial Pacific and Peru continental margin, we completed 32 accelerator mass spectrometry (AMS) C dates from cores recovered during Ocean Drilling Program (ODP) Leg 201.
Sample preparation and measurement were carried out at the ANTARES AMS facility, Australian Nuclear Science and Technology Organisation (ANSTO), in Sydney, Australia (Lawson et al., 2000; Fink et al., 2004).
Until recently, there were no radiocarbon dates from late Quaternary sediments of this location.
Eight samples from the Ulleung Basin cores were accelerator mass spectrometry (AMS) -values as 400 yr.
The lake sediment sequence of Nedre Hervavatnet demonstrates the following: only a reliable high-resolution geochronology based on carefully selected terrestrial macrofossils allows the reconstruction of a more refined and complex environmental change history before and during the 8.2 ka event.
We present the results on radiocarbon dating of planktonic foraminifera samples from two piston cores collected from the western part of the Ulleung Basin, East/Japan Sea.
We use the method of radiocarbon wiggle-match dating of the lake sediments using the non-linear relationship between the C calibration curve and the consecutive accumulation order of the sample series in order to build a high-resolution age-model.
The timing and duration of Holocene environmental changes is estimated using 38 AMS radiocarbon dates on terrestrial macrofossils, insects and chironomids covering the time period from 9750 to 1180 cal BP.
Fewer dates are available for the lower Holocene section, and these cannot be interpreted with confidence; however, they do suggest a significantly lower early Holocene sedimentation rate compared with either the late Holocene or the LGIT (MOI Stage 2) periods.
Six radiocarbon ages from the stratigraphically deepest part of the section dated in Hole 1228B yielded late MOI Stage 3 ages ranging from 28,740 to 44,550 radiocarbon yr.
Chironomids, leaves produce the most consistent results.