Erratum to “Calibration of the 14C time scale to >40 ka by 234U–230Th dating of Lake Lisan sediments (last glacial Dead Sea)” [Earth Planet. Sci. Lett. 175 (2000) 27–40]

14 C Activity and Global Carbon Cycle Changes over the Past 50,000 Years

“…ka B.P., but at much lower resolution. Varved lake sediments (6), U/Th ages on speleothems (7) and lake sediments (8), and marine sediments correlated to Greenland ice core chronologies (9, 10) have also been used to constrain calibration and initial 14 C activity [expressed as ⌬ 14 C (11)] beyond the range of Intcal98. In many cases, these records suggest that extremely large and rapid shifts in ⌬ 14 C have occurred; however, these records also show disagreements before ϳ25 cal.…”

“…A few exemplary morphometric studies of marine microfossils have focused on the ecological aspects of evolutionary change (3,4), although most have concentrated on the stratigraphic patterns of size and shape changes (5-7). Macroevolutionary processes-evolution above the species level-may be characterized by changes in diversity, longevity, speciation and extinction rates, and the size of fossil organisms (8).…”

A Better Radiocarbon Clock

“…Several groups have tried to extend this curve from 26,000 to 50,000 calendar years B.P. The records used for this purpose include annually laminated sediments (varves) from Lake Suigetsu in Japan (4,5), corals from the uplifted terraces of New Guinea (6), sediments of the former Lake Lisan in Israel (7), carbonate deposits from a submerged cave of the Bahamas (8), and deep-sea sediments whose stratigraphy can be tied to the Greenland Summit ice cores (9). The latter method is based on correlating a known paleoclimatic event dated by 14 C-such as transient warmings and massive glacial surges that occurred abruptly over periods of decades-with its equivalent in another record (such as a Greenland ice core) that has been dated with techniques other than radiocarbon.…”