黑龙江绥滨地区晚侏罗世东荣组的沟鞭藻类  

DINOFLAGELLATES FROM UPPER JURASSIC DONGRONG FORMATION OF SUIBIN, HEILONGJIANG

作　　者：孙学坤[1] 何承全[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》1992年第2期190-205,267-270,共16页Acta Palaeontologica Sinica

摘　　要：本文对黑龙江绥滨86-11孔的沟鞭藻类进行了初步研究,共描述化石10属16种(包括2新种,6未定种);其中不少是在我国首次描述的。这些化石分成两个组合,其优势分子分别为Gonyaulacysta jurassica和Amphorula delicata。根据组合内各分子的时代分布,两化石组合的时代分别为Late Oxfordian—Early Kimmeridgian和Portlandian期,并对其产出层位东荣组的时代作了讨论,认为属于晚侏罗世。The Mesozoic coal-bearing strata in eastern Heilongjiang are called the Jixi Group, consisting of non-marine deposits in the upper part and marine sequences (Dongrong Formation) in the lower part. At the site of Core 86-11, the Dongrong Formation, with a thickness of about 400m, is composed of dark grey sihstone and greyish white fine sandstone. The 3 samples studied in this paper were collected from this sequence at depths of 755m, 754m and 541.8m respectively. The present paper describes 10 genera, 16 species (including 2 new species and 6 undefined species) of dinoflagellate cysts which are divided into 2 assemblages: (1) The Gonyaulacysta jurassica Assemblage(at a depth of 755—754m) consists of the dominant species Gonyaulacysta jurassica (nearly 95%), together with G. heliaoidea, G. dualis, G. sp., Occisucysta elongata sp. nov., Rigaudella aemula, Chytroeisphaeridia suibinensis sp. nov., Trichodinium castanea, Apteodinium frontierense, A. sp., Tubotuberella sp. and Scriniodinium sp. (2) The Amphorula delicata Assemblage (at a depth of 541.8m) is dominated by Amphorula delicata and A. sp., with Gonyaulacysta jurassica and Endoscrinium galeritum also being found. The following table gives a general view on the stratigraphic distribution of these genera and species based on the previously published data. Based on the global distribution of these dinocysts, the two assemblages are determined as Late Oxfordian—Early Kimmeridgian and Portlandian in age respectively. Description of New Species Family Gonyaulacystaceae Sarjeant et Downie emend. Sarjeant et Downie, 1966 Genus Oeeisucysta Gitmez, 1970 emend. Jan du Chene et al., 1986 Type Species Occisucysta balios Gitmez, 1970 emend. Jan du Chene et al., 1986 Occisucysta elongata sp. nov. (Pl. Ⅰ, fig. 9; Pl. Ⅳ, fig. 1) Description Cyst elongate-ellipsoidal to polygonal, with an apical horn of 15.4—24.2 μm; antapical end truncate. Parasutural crests faintly denticulate

关 键 词：晚侏罗世 东荣组 沟鞭藻类 

分 类 号：Q914.82[天文地球—古生物学与地层学]