A new microsplitter for unconsolidated sediments |
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| Authors: | John T Guptill Yvonne Herman Sam C Saunders |
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| Institution: | 1. Division of Sciences, Washington State University, Pullman, Wash. U.S.A.;2. Department of Geology, Washington State University, Pullman, Wash. U.S.A.;3. Department of Pure and Applied Mathematics, Washington State University, Pullman, Wash. U.S.A. |
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| Abstract: | Unrepresentative subsamples can be obtained from a sedimentary sample through repeated subdivision when using a mechanical microsplitter. Physical biases are often compounded by repetition and can result in wide variations among the estimates computed from the relative proportion of foraminifera of a given species. A new microsplitter, designed on a new principle, has been built to separate small representative subsamples. The device is based on the uniform distribution of unconsolidated sediments suspended in water. A subsample of the desired size is obtained by collecting sediment from an appropriate sedimentation area. Operation of this sampler is rapid and convenient and requires only one step, thus eliminating sampling biases introduced by repeated operations with other splitters. This new device was tested and found to be superior to the Otto Microsplitter according to some statistical goodness-of-fit tests conducted on the series. |
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