Polski, W. (1959). Foraminiferal biofacies off the North Asiatic coast. Journal of Paleontology. 33(4): 569-587.

188371

Polski, W.

1959

33(4): 569-587

Publication

A total of 158 bottom samples from the northern Asiatic shelf were examined in order to determine the horizontal and vertical variations in the distribution of the foraminiferal populations. Salinity, temperature, depth, and currents were studied in an attempt to determine the controlling factors in the distribution of the faunas. It was found that the foraminiferal number, percentage of the planktonic population, and species number increase with depth and distance from shore. The ostracod number, however, was highest near the edge of the continental shelf. A depth stratification of some of the planktonic species was noted. The arenaceous and porcelaneous populations were most characteristic of depths less than 250 feet, whereas hyaline populations predominate in deeper water. Five distinct faunal zones were found between the depths of 50 feet to 4400 feet. Phosphatized Foraminifera and sediments located in the zone of the shelf edge are probably relics of lower sea levels. The degree of preservation of the modern Foraminifera appears to be related to the rate of sedimentation and the length of time exposure. Depth alone does not appear to be the main control of faunal assemblages. The The Kuroshio Current appears to be a major factor in the final distribution of planktonic forms and possibly those benthonic forms living at depths within the effects of the current. It is probable that salinity, temperature, sediment characteristics, and organic contents are all important ecologic factors. Two varieties of Foraminifera are described as new.

Foraminifera

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