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地球学报  2010 

重庆北碚老龙洞二叠-三叠系界线层中的全脐螺侏儒化:环境突变中的机会群落?

DOI: 10.3975/cagsb.2010.02.05

Keywords: 全脐螺,侏儒化,灾变环境,二叠-三叠系界线,重庆北碚

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Abstract:

本文首次报道重庆北碚老龙洞剖面二叠-三叠系界线附近的全脐螺科的微型腹足类动物群。全脐螺科个体微小,多为盘形、圆锥形,具明显的脐,方解石质的壳壁。区分出研究层内的两类全脐螺,一类是碗形,脐宽而大,脐部深凹;壳壁厚度变化很大,螺环可能上有棱、角或瘤等装饰。另一类是胎壳呈平旋状,呈开放式旋绕;壳壁厚度均匀,未见装饰特征显示。全脐螺类为优势分子的群落在二叠纪末大绝灭事件后盛极一时,如此异常现象可能与浅海区在缺氧之后暂时改善为有氧环境有关,此后随着早三叠世腹足类的全面复苏,它们只能退居为极次要的角色。

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