DINOFLAGELLATE ASSEMBLAGE FROM THE UPPERMOST PART OF THE DONGRONG FORMATION WITH DISCUSSION ON JURASSIC-CRETACEOUS BOUNDARY IN SUIBIN AREA, NORTHEASTERN HEILONGJIANG PROVINCE, NE CHINA
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Abstract:
The Dongrong Formation previously considered Late Jurassic in age, distributed in the Suibin area of northeastern Heilongjiang Province of NE China, is a unit of continuous shallow marine clastic sediments with a maximum thickness of about 395 m. It may be divided into two parts, the lower part consisting of dark grey and black siltstones intercalated with some tuffbeds, and the upper part composing of grey and dark green fine grained sandstones intercalated with tuffs. Sun Xue kun and He Cheng quan(1992)reported abundant marine dinoflagellate fossils from both parts of the formation. A rich and diverse dinoflagellate cyst assemblage dealt with in this work is obtained from the uppermost part of the Dongrong Formation of seven boreholes in the area. It is composed of at least 19 genera and 30 species with 1 variety of dinocysts, 1 genus 1 species of acritarchs, of which 21 species with 1 variety of dinoflagellates are described and illustrated, including one new species,Leberidocysta suibinensis sp.nov.
