THE TRILOBITE BIOSTRATIGRAPHY OF THE BALANG FORMATION, DUYUNIAN STAGE, QIANDONG SERIES (CAMBRIAN SERIES 2, STAGE 4) FROM HUANGLIAN AREA IN SONGTAO COUNTY, GUIZHOU PROVINCE AND ITS CORRELATION SIGNIFICANCE
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Abstract:
The Huanglian section located in the west of Huanglian village, Songtao County, Guizhou Province was the basic section for establishing the Nangaoan Stage and the Duyunian Stage by Peng Shanchi et al. in 2000. We restudy some materials collected from the Balang Formtion of the Huanglian section eighteen years ago. The Balang Formtion in Huanglian section consists of dark gray and grayish black silty mudstone. Its thickness is 417.8 m. The lithology of the Balang Formation in Huanglian is similar to that of the Balang Formation in east Guizhou and west Hunan. The trilobites are very abundant except the lower part from the base boundary to 38 m and two trilobite zones are defined according to the collected data: Oryctocarella duyunensis Zone, occupies lower part of the Balang Formation from 38 m to 83 m above the base; Arthricocephlus chauveaui Zone, occupies middle-upper part of the Balang Formation from 83 m to the upper unit, the “Tsinghsutung Formation”, including Arthricocephlus chauveaui, A. xinzhaiheensis, Oryctocarella duyunensis, O. sibirica, O. balangensis, Duyunaspis duyunensis, Changaspis elongata and Redlichia (Pteroredlichia) murakamii. The trilobite biostratigraphy of the Balang Formation at the Huanglian section is exactly the same as that of the Balang Formation at the Jiaobang section which is the potential Global standard stratotype-section and point (GSSP) for the base of the Cambrian Stage 4 and can correlate with the Henson Gletscher Formation in Freachen land and Peary land of North Greenland. The Huanglian section is a good supplementary section of the Jiaobang section for the Palang Formation.
