| 甘肃永登石灰沟中堡群及马营沟群的笔石层位 |
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| 引用本文： | 宋礼生.甘肃永登石灰沟中堡群及马营沟群的笔石层位[J].甘肃地质学报,2001(1):9-16,25,96. |
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| 作者姓名： | 宋礼生 |
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| 作者单位： | 西安地质矿产研究所!陕西西安710054 |
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| 摘 要： | 甘肃省永登石灰沟中奥陶统中堡群 (OZ)中的笔石群属兰代洛阶至卡拉多克阶早期 ,共 3个笔石层位 ,其中包括 2个笔石带 :(1)Glyptograptusteretiusculus带 ,(2 )Nemagraptusgracilis带 ;1个笔石层 :(3)ClimacograptusstyloidesLapworth -C .antiquuslineatusEllesetWood层。下志留统马营沟群 (S1my)笔石群属兰多维利阶中期 ,1个笔石层是RastritesapproximatusGeinitzi(Tornquist)层。
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| 关 键 词： | 中堡群 马营沟群 笔石层 笔石组合 笔石群 |
GRAPTOLITES STRATOHORIZONS OF ZHONGBAO AND MAYINGGOU GROUPS IN SHIHUIGOU REGION,YONGDENG,GANSU |
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| SONG Li,sheng.GRAPTOLITES STRATOHORIZONS OF ZHONGBAO AND MAYINGGOU GROUPS IN SHIHUIGOU REGION,YONGDENG,GANSU[J].Acta Geologica Gansu,2001(1):9-16,25,96. |
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| Authors: | SONG Li sheng |
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| Institution: | SONG Li sheng (Xi’an Institute of Geology and Mineral Resources,Shanxi,Xi’an 710054,China) |
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| Abstract: | The graptolite colonies in Mid-Ordovician Series,Zhongbao Group (OZ) in Shihuigou region (Yongdeng,Gansu Province) belongs to from Llandeilian to early Caradocian.It consists of two graptolite zones and one graptolites stratohonzon as follawing: 1.Glyptograptus tereliusculus zone 2.Nemagraptus gracilis zone 3.Climacograptus stuloides-C.antiquus lineatus stratohorizon Mayinggou Group (S 1 my) graptolite colong of lower silurian belongs to middle liandoverian.In this district,only one stratohorizon is discovered,that is Rastrites approximatus Geinitzi (Tormguist) stratohorizon. |
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| Keywords: | Zhongbao Group Mayinggou Group Graptolite stratohorizon Graptolite assemblage Graptolite colony |
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