摘要
首次在新疆塔里木盆地塔中地区中2井上奥陶统良里塔格组礁岩中发现保存精美的牙形刺化石,包括6属13种和未定种,含一个新亚种Belodina longxianensis minor subsp.nov.。根据牙形刺化石确定,良里塔格组上部属于上奥陶统中部的Belodina confluens带。中2井良里塔格组第2—4层生物礁发育的精确时代是Belodina confluens带。
Conodonts including 13 species in 6 genera are described from the Lianglitag Formation in Well Z2 of the central Tarim Basin, which ranges from 5 474 to 6 284 m. They are Aphelognathus pyramidalis?, Aphelognathus divergens? ,Belodina confluens, Belodina baiyanhuaensis, Belodina longxianensis, Belodina longxianensis minor subsp, nov. , Belodina sp. A, Belodina sp. B, ? Microzarkodina sp. , Panderodus gracilis postoscrobus, Plectodi- nacf. bidentata, Plectodina sp. , Yaoxianognathus lijiapoensisV and Yaoxianognathus yaoxianensis ?. Occurrence of Belodina confluens at 5 522-5 531.6 m indicates that this interval belong to the Belodina confluens Zone. Depth of 5 531.6-6 197.3 m probably belongs to the Belodina confluens Zone, and this needs more study to confirm. Five beds of reef-facies occur in the Lianglitag Formation. The reefal beds 2 to 5 belong to the Belodina confluens Zone.
出处
《微体古生物学报》
CSCD
北大核心
2014年第3期285-293,共9页
Acta Micropalaeontologica Sinica
基金
国家自然科学基金项目(编号40802001,41372121)
973项目(2012CB214806)资助
关键词
牙形刺
生物礁
良里塔格组
上奥陶统
塔里木
塔中
新疆
Conodonts, Lianglitag Formation, Upper Ordovician, Tarim Basin, Xinjiang, China