The study of this core was carried out cooperatively with Bill Curry of Woods Hole Oceanographic. Our goal was to obtain benthic-planktonic age difference for the glacial section of the core (see Figs 1, 2, Table 1).

Study of the dependence of core top ages for G menardi and G sacculifer on water depth in cores of low sedimentation rate (∼2cm/103 yr). The study was initiated by Lisa Dubois of Brown University on cores originally studied by Curry and Lohmann of Woods Hole Oceanographic (see Table 2).

The study of these whole shell, shell fragment pairs from trigger weight cores from the western equatorial Atlantic was initiated by Alan Mix (see Table 3).

The study of this northern Atlantic core was undertaken to establish the chronology of surface water temperature changes in the northern Atlantic from 40,000 years ago to present (see Figs 3, 4; Table 4).

The study of this core was undertaken to measure the benthic-planktonic age difference for the “Boyle water” of glacial time in the Caribbean Sea (see Figs 5,6; Table 5).

The study of this core was undertaken in cooperation with James Kennett. The purpose was to establish the chronology of the Mississippi River melt water record (see Figs 7,8; Table 6).

This study was undertaken in cooperation with David Clark of the University of Wisconsin in order to confirm the previous estimates of low sedimentation rates in the Arctic Basin (see Table 7).

This study was carried out in cooperation with Steve Emerson of the University of Washington. The purpose was to obtain benthic-planktonic and planktonic-planktonic age differences on hand-picked foraminifera shells. Material was taken from two separate subcores from the primary 50cm2 box core (see Tables 8, 9).

These cores were chosen for our initial effort because they typified normal open ocean conditions (see Fig 9; Tables 10, 11).

This study was undertaken to determine the time history of the surface to deep 14C/C ratio difference for the Pacific Ocean (see Fig 10; Tables 12, 13).

This project was initiated by Alan Mix working in cooperation with Jack Dymond. It involves measurements of one size fractions and hand-picked foraminifera shells from material caught in sediment traps deployed in the equatorial Pacific Ocean (see Tables 14, 15).

This is the first of a series of new lists of English archaeological dates commissioned for measurement by the Historic Buildings and Monuments Commission within prescribed contractual periods. This list, containing 121 dates, refers to the measurement period, April 1985 to March 1986, and results are reported irrespective of whether the associated projects are completed or ongoing.

The results presented in this list are mostly from our earlier years of operation, the most recent of which were measured in 1984. It is the second of a series of special lists being prepared hopefully to clear the backlog of unpublished dates of this laboratory. All samples are of archaeological origin from the United Kingdom; most have originated from “rescue” type excavations and all were sponsored by the Ancient Monuments Laboratory of the Historic Buildings and Monuments Commission.

Geologic samples for 14C age measurements were collected from the west, southwest and south coasts of Sri Lanka during October and November 1986. Sample points were leveled based on the Colombo datum level. Results presented below were obtained by liquid scintillation counting of methanol for coral and shell samples. Ages were measured from December 1986 to May 1987, at the Department of Geography, Hiroshima University, Radiocarbon Dating Laboratory, using the laboratory procedure described by Fujiwara and Nakata (1984). Sample preparation techniques were similar to those mentioned in the first list (Katupotha, 1988). The results are expressed in radiocarbon years relative to ad 1950 based on the Libby half-life of 5568 ± 30 years, using the new oxalic acid standard (SRM 4900C) as ‘modern’ (Stuiver, 1983).

The development and improvement of benzene synthesis for radiocarbon dating by liquid scintillation counting was started at LATYR in 1981. The basic technique employed was described by Polach, Gower & Frazer (1972). The line of benzene synthesis is similar to that used by Coleman et al (1972). The pretreatment of the samples and transformation to CO2 has been previously described (Figini et al, 1984). The conditions of measurement were partially determined according to Pearson (1979). Results of measurements of interlaboratory check samples using the technique described are given.

The Radiocarbon Dating Laboratory was established at the Middle East Technical University in the Physics Department with the equipment provided by the British Government through former CENTO auspices and financial support by the Ford Foundation. This list reports on 14C dates measured up to July 1987.

GEOTOP is the geochemistry and geochronology research center of the Université du Quebec à Montréal (UQAM). The Radiocarbon Laboratory was established to meet the growing demand for radiocarbon dating in Québec. The laboratory was founded by Claude Hillaire-Marcel. The first measurements were completed in October 1978. The laboratory was managed by Pierre Pagé until May 1985. Serge Occhietti and Pierre Pichet are presently in charge. Technical maintenance is under the direction of Claude Jacob.

Procedures and equipment used in the University of Wisconsin laboratory have been described in previous date lists. Except as otherwise indicated, wood, charcoal, and peat samples are pretreated with dilute NaOH—NA4P2O7 and dilute H3PO4 before conversion to the counting gas methane; when noted, marls and lake cores are treated with acid only. Very calcareous materials are treated with HCL instead of H3PO4. Pretreatment of bone varies with the condition of the bone sample; solid bone with little deterioration is first cleaned manually and ultrasonically. The bone is treated with 8% HCL for 15 minutes, then dilute NaOH—Na4P2O7 for 3 hours at room temperature, washed until neutral, and the collagen extracted according to Longin (1971). Charred bone is treated with dilute HCL, NaOH—Na4P2O7, and then dilute HCL again.

A microwave oven is used to pretreat carbonate samples prior to graphitization and radiocarbon dating by accelerator mass spectrometry. The method reduces the risk of contamination of small carbonate samples and provides a fast and convenient method for the acid evolution of CO2.