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Texas A & M University Radiocarbon Dates III
Abstract
This date list is composed of the ages of tests of fossil populations of the foraminiferal species, Amphistegina gibbosa, and algal nodules collected from submerged banks in the N Gulf of Mexico. A Shipek grab sampler was used to collect the Amphistegina gibbosa and a few of the algal nodule samples. Algal nodules from the West Flower Garden Bank were obtained from cores at various intervals as indicated in Sec III.
All samples were acid leached to remove possible surface contaminants. Samples, analyzed using standard procedures (Kim et al, 1969 Mathews et al, 1972), were counted from 2000 to 3000 minutes. Ages are calculated using a 14C half-life value of 5568 years and 0.95 of the present day activity of the NBS oxalic acid standard. All ages have also been corrected for the isotopic fractionation occurring in nature. Variations in the isotopic ratio, 8130, are reported as the per mil (%) deviation from the Chicago PDB Standard. Indicated errors refer to one standard deviation calculated from a statistical analysis of sample, standard and background count rates.
All samples were acid leached to remove possible surface contaminants. Samples, analyzed using standard procedures (Kim et al, 1969 Mathews et al, 1972), were counted from 2000 to 3000 minutes. Ages are calculated using a 14C half-life value of 5568 years and 0.95 of the present day activity of the NBS oxalic acid standard. All ages have also been corrected for the isotopic fractionation occurring in nature. Variations in the isotopic ratio, 8130, are reported as the per mil (%) deviation from the Chicago PDB Standard. Indicated errors refer to one standard deviation calculated from a statistical analysis of sample, standard and background count rates.