摘要
鄂西二叠纪茅口组顶部古岩溶不整合面粘土层中产丰富的牙形石 ,计有 3属 3种 2未定种 ,标本色泽和被磨损特征等显示它们均为再沉积产物。通过对上述牙形石属种的演化特征、地质时限及产出层位的研究 ,认为该古岩溶不整合的形成时代为二叠纪Wordian晚期—Capitanian早期 (M .aserrata带上部—M .postserrata带 )。
The conodonts illustrated in this paper were collected from paleokarst unconformity at the top of the Permian Maokou Formation,western Hubei.The conodonts are products of redeposition,as shown by color,luster and worn out character of samples.Based on the evolutionary characteristics,geological time limits and modes of occurrenceofconnodonts,thepaleokarstunconformityisconsideredtobeofLateWordian—Early Capitanian in Permian.(i.e., upper part of M.aserrata zone—M.postserrta zone).
出处
《地球学报》
EI
CAS
CSCD
北大核心
2001年第2期157-158,共2页
Acta Geoscientica Sinica
基金
1:5万<巫山县幅>(H49E0 0 6 0 0 8)
<官渡河幅>(H49E0 0 70 0 8)区调联测部分成果
