David A. Baerreis

Further light on carbon isotopes and Hopewell agriculture

The 13 C/ 12 C ratio in human collagen was determined for 19 individuals from Hopewell sites in Wisconsin, Illinois, and Ohio, and compared with 27 new measurements from individuals at Archaic, Mississippian, and Late Woodland affiliation. Additional measurements were made of elements in the food chain and on experimental animals fed on a diet of known composition containing maize. The similarity of the Hopewell measurements to those of non-maize diets indicates that corn was of little importance in the Hopewell diet for those populations tested. -- AATA

possibilities of major climatic modification and their implications: Northwest India, a case for study

On the basis of field observations and theoretical studies it is believed that the dense pall of local dust over northwestern India and West Pakistan is a significant factor in the development of s...

University of Wisconsin radiocarbon dates II.

This report summarizes the radiocarbon dates obtained at the University of Wisconsin since November 1964; the procedures followed have been described previously (Wisconsin I, 1965). The counting equipment has been supplemented with a second detector of 500 ml volume for which the nominal background at 1 std atm, 298.2° K, is 2.1 cpm as determined with petroleum methane (Phillips Petroleum Co.). The corresponding standard count for contemporary methane derived from NBS oxalic acid 95% A ox , is nominally 2.8 cpm at 1 std atm, 298.2° K. The additional counting equipment was also obtained from the Sharp Division of Beckman Instrument Co.

University of Wisconsin Radiocarbon Dates VII

Carbon-14 ages, geologic and archeologic samples, United States and other localities; for reference to dates VI, see this Bibliography Vol. 33, No. 7, 06 E69-14717.

University of Wisconsin radiocarbon dates I.

Carbon-14 dating results of a program begun in 1963 using the methane method are reported for archeologic samples from Iowa, Oklahoma, and Mexico and geologic samples from Manitoba, Northwest Territories, and Wisconsin.

University of Wisconsin radiocarbon dates VI.

Radiocarbon dates obtained since December 1967 are included in this list. Archeologic samples are from Wisconsin, Iowa, Illinois, and Oklahoma. Collection and dating of fossil organic material for the study of Canadian paleoenvironments continues with the object of further delineating by palynology and stratigraphy the extent and nature of vegetational and climatic changes already established in central and northern Canada. Geologic samples are from Alberta, Manitoba, and Northwest Territories.

University of Wisconsin Radiocarbon Dates XVII

Procedures and equipment have been described in previous date lists. Except as otherwise indicated, wood, charcoal and peat samples are pretreated with dilute NaOH and dilute H3PO4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous materials are treated with HC1 instead of H3PO1.

University of Wisconsin Radiocarbon Dates V

Geologic samples from central USA, archeologic samples from Wisconsin (USA) and central and northern Canada.

University of Wisconsin radiocarbon dates XIV.

Procedures and equipment of the laboratory have been described in previous date lists. Wood, charcoal, and peat samples are pretreated with dilute NaOH and dilute H 3 PO 4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous samples are treated with dilute HCl instead of H 3 PO 4 .

University of Wisconsin radiocarbon dates IV.

Radiocarbon dates obtained since November 1966 are summarized for archeologic samples from Wisconsin, Illinois, and Oklahoma; and geologic samples from Iowa, Manitoba, and Northwest Territories.