. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. charcoal Beta-76019 *K 200±60BP (IV) medium-coarse sand 0 beach sand and cobbles Site 3 Unit 1, E profile * coconut root probable base of historic dense gravel dense oven layer <b o O dense gravel. ⢠'â¢'â :'â : sand lens: ^ ^ Beta-79583 O O . ° 30±50BP O 0 ^> O , medium-coarse sand beach sand and cobbles ^ C? 0 FIGURE 13. Profiles of unit 1, site 3, Bock islet. essed by Beta Analytic Inc. Pretreatment of the carbonized material consisted of mechani- cal cleaning with gentle crushing, followed by was
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. charcoal Beta-76019 *K 200±60BP (IV) medium-coarse sand 0 beach sand and cobbles Site 3 Unit 1, E profile * coconut root probable base of historic dense gravel dense oven layer <b o O dense gravel. ⢠'â¢'â :'â : sand lens: ^ ^ Beta-79583 O O . ° 30±50BP O 0 ^> O , medium-coarse sand beach sand and cobbles ^ C? 0 FIGURE 13. Profiles of unit 1, site 3, Bock islet. essed by Beta Analytic Inc. Pretreatment of the carbonized material consisted of mechani- cal cleaning with gentle crushing, followed by washings in de-ionized water and removal of any rootlets. Acid washes were used to remove carbonatesâa potential problem with sam- ples recovered from calcareous sands on atollsâand alkali washes removed secondary organic acids. The beachrock sample was processed in a similar manner. All procedures went normally. Table 1 presents the details for each dated radiocarbon sample. When possible, discrete combustion features were selected for dating of known material such as coconut shell or husk and Pandanus keys (or drupes). Unidentified wood charcoal was part of two samples and the sole material for one sample. Ideally, it is best to get wood charcoal identified prior to dating to eliminate the possibility of "old" wood that can produce dates not related to the target event (Dean 1978). A thumb-sized piece of wood charcoal was submitted from an oven (Beta-79582) to Gail Murakami of International Archaeological Research Institute, Inc. for identification. The sample could not be identified due to a lack of adequate refer- ence material. It is prudent that atoll reference plants be collected to facilitate wood char- coal identifications which would not only furnish better control for radiocarbon dating, but provide insights into plant use and, perhaps, environmental change during prehistory (Hastorf and Popper 1988; Weisler and Murakami 1991). The oldest date fo
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