摘要
本文详细地研究了石炭系达拉阶标准 (或层型 )剖面 ,即贵州盘县达拉寨剖面的牙形刺。在标准剖面达拉阶上部 ,即相当于先前的有孔虫 Fusulinella- Fusulina带的层位 ,产牙形刺 Idiognathodus podolskensis,I.delicatus,I.magnificus,I.obliquus,I.claviformis,Streptognathodus cancellosus和 S.parvus等 ,并自下而上可划分为 Id-iognathodus podolskensis带和 Streptognathodus cancellosus带 ,前者相当于有孔虫 Fusulina pakhrensis- Pseu-dostaffella paradoxa带下部及 Fusulina lanceolata- Fusulinella vozhgalensis带 ,后者则与 Fusulina pakhrensis-Pseudostaffella paradoxa带上部和 Fusulina cylindrica- F.quasifusulinoides带相当 ,并可与东欧的莫斯科阶(Moscovian)上部对比。标准剖面达拉阶下部 ,即相当于有孔虫 Profusulinella带的层位未见牙形刺化石 ,但根据贵州罗甸纳水剖面的资料 ,有孔虫 Profusulinella带之底在牙形刺 Diplognathodusophanus- D.ellesmerensis带之中通过 ,因此在罗甸纳水剖面 ,达拉阶之底比莫斯科阶之底要稍高些。纳水剖面的有孔虫来自台地垮塌的沉积 ,这类沉积物是不连续的 ,因此其有孔虫带与牙形刺带的关系并不十分可靠。但总的来看 。
This paper describes the conodonts from the Dala section of Panxian, Guizhou, the type section of the Carboniferous Dalaan Stage in China. The upper part of the Dalaan, which corresponds to the original foraminifera Fusulinella-Fusulina Zone, contains conodont Idiognathodus claviformis, I. delicatus, I. magnificus, I. obliquus, I. podolskensis, Streptognathodus cancellosus and S. parvus. It can be subdivided in descending order into the Streptognathodus cancellosus and Idiognathodus podolskensis zones. The former zone can be correlated with the upper part of the fusulinid Fusulina pakhrensis-Pseudostaffella paradoxa Zone and the Fusulina cylindrica-F. quasifusulinoides Zone in the section. The latter zone is corresponding to the lower part of the foraminifera Fusulina pakhrensis-Pseudostaffella paradoxa Zone and the Fusulina lanceolata-Fusulinella vozhgalensis Zone in the section. They can be correlated with the upper part (Podolskian and Myachkovian) of the Moscovian Stage. In the lower part of the Dalaan in the Dala section, which is equivalent to the foraminifera Profusulinella Zone, there are no conodonts. But according to Wang and Qi (2003a,b), in the Nashui section, Guizhou, the base of the foraminifera Profusilinella Zone (N59) corresponding to the base of the Dalaan is within the conodont Diplognathodus ophanus-D. ellesmerensis Zone (N55-63). Based on the occurrences of some characteristic species, such as Diplognathodus ellesmerensis, Neognathodus ato- kaensis, N. aff. bothrops in both areas, the Diplognathodus ophanus-D. ellesmerensis Zone of the Nashui section, Guizhou, can be correlated with the Declinognathodus donetzianus Zone of Europe. Because the base of the Declinognathodus donetzianus is equivalent to the base of the Moscovian (Nemyrovska, 1999; Isakova, 2001; Wang & Qi, 2003a), so the base of the Dalaan in the Nashui section is slightly higher than that of the Moscovian. But based on the foraminifera zone in the Dala section, the base of the Dalaan can be correlated with the top part of the Bashkirian. The upper part of the Dalaan in the Dala section can only be correlated with the upper part of the Moskovian of Europe. So the Dalaan of China can approximately be correlated with the Moscovian.
出处
《微体古生物学报》
CSCD
北大核心
2004年第3期283-291,共9页
Acta Micropalaeontologica Sinica
基金
全国地层委员会中国主要断代地层建阶研究项目
中国科学院重大项目 ( KZCX2 -SW-12 9)
中国科学院南京地质古生物研究所创新基金 ( 0 40 5 0 2 )的资助
