Statistical method of ostracod fossil abundance

Abstract

The statistical method of ostracod fossil abundance, distinguishes ostracods as adults or larvae by observing the edge structure of ostracods under a stereo microscope; and observes the relationship between the two shells of ostracods, namely the left shell and the right shell The ostracods whose shells are hinged together are double-valve shells, and those with only one valve are single-valve shells. For single-valve shells, the head of the ostracods is turned upward and the tail is downward. The single-valve shells on the left side of the ostracods are The left shell, the single-valve shell on the right side of the ostracods is called the right shell to distinguish the ostracods as double-valve shells, left shells or right shells; finally, according to the number of left shells of ostracods and the number of right shells of ostracods Different methods were used to calculate the abundance of ostracod fossils. Comparing the correlation between the abundance obtained by the ostracod fossil abundance statistical method of the present invention and the abundance obtained by the general abundance statistical method and its geochemical indicators shows that the statistical method of the present invention can reflect the sediment more accurately and objectively. The number of ostracod fossils actually preserved in the zodiac is conducive to the reconstruction of paleoclimate.

Description

technical field [0001] The invention relates to the field of fossil abundance statistics, in particular to a method for statistics of ostracod fossil abundance. Background technique [0002] Ostracod fossils are good materials for reconstructing paleoclimate and paleoenvironment, and abundance is one of the most basic and important parameters in the analysis of ostracod fossils, which plays an important role in paleoclimate reconstruction. At present, the general method for estimating the abundance of ostracod fossils is as follows: firstly distinguish the number of double-valve shells or single-valve shells in fossil ostracods, and then add the number of double-valve shells and single-valve shells to obtain the ostracod Fossiloid abundance, where the number of single-valve shells is the sum of the number of left shells and right shells. [0003] However, ostracods need to molt 8 times before becoming adults, and they will produce 8 larval shells and 1 adult shell in their ...

AI Technical Summary

Problems solved by technology

In the existing ostracod fossil abundance statistics, since a left shell and a right shell may come from the same shell, and juvenile shells and adult shells are not distinguished, multiple larval shells may also come from the same adult individual, Therefore, the number of ostracod fossil individuals counted by the existing ostracod fossil abundance methods is often inaccurate, and is often greater than or far greater than the actual number of ostracod fossil individuals preserved in sediments.

The relevant conclusions drawn based on the abundance obtained by existing methods are naturally not scientific and objective, which greatly limits the potential of ostracod fossils in paleoclimate reconstruction.

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