<SPAN style="COLOR: black; FONT-SIZE: 14pt; mso-font-kerning: 18.0pt; mso-bidi-font-weight: bold" lang=EN-US><FONT face="Times New Roman">On the Division of Upper-Lower Cretaceous Boundary in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:PlaceName w:st="on">Songliao</st1:PlaceName> <st1:PlaceType w:st="on">Basin</st1:PlaceType></st1:place> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN>

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On the Division of Upper-Lower Cretaceous Boundary in Songliao Basin

详细信息

责任者：Huang Qinghua (Exploration and Development Research Institute of Daqing Oilfield Company Ltd. ; Daqing 163712 ; China) ; Zhang Wenjing
刊名：Earth Science Frontiers
出版年：2009
卷期：16(6)
关键词：晚白垩世 ; Upper Cretaceous ; 早白垩世 ; Lower Cretaceous ; 松辽平原 ; Songliao Plain
页码：p.77-84
图表：1 illus., 1 table, 59 refs.
分类号：1200
issnNo：ISSN1005-2321
isbnNo：CN11-3370/P

摘要

The Songliao Basin was a big lake during the mid-Cretaceous, where Jehol, Songhuajiang and Mingshui biotas were developed in the Cretaceous, the organic of the lake expressed the sequence, the explosion and the extinction of the three biotas. The Songhuajiang Biota consisted of ostracodes, conchostracans, bivalves, charophytes, dinoflagellates, palynoflora, angiospermae etc. with distinct regional features. The magnetostratigraphic research indicated that the polarity from the Denglouku to the Yaojia formation is normal, but twice brief reversed polarity occurred in the Upper Part of the Denglouku Formation and the Lower Part of the Yaojia Formation.

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