黔中、黔南三叠纪古生态、古群落研究

PALAEOECOLOGY AND FOSSIL COMMUNITIES IN SOUTHERN AND CENTRAL GUIZHOU DURING TRIASSIC TIME

关键词:  古生态  古群落  三叠纪  贵州

Key words:  palaeoecology  fossil community  Triassic  Guizhou

摘要:

本文在对黔中、黔南三叠纪古生物群的古生态,古环境作研究后,提出了中三叠统青岩组(或新苑组)中深水瓣鳃、菊石群落的堆积形成机理;贵州龙水生爬行动物群繁盛、埋藏、保存受控于拉丁期全球大海退以及特殊的台地边缘"S"形浅滩带上出现的半封闭海湾;同时,建立了由台地至深水的4个遗迹化石组合,牙形刺和瓣鳃类化石从浅水至深水沉积层中的分布系列。

Abstract:

The accummulation and genetic mechanism for the deep-water pelecypod and ammonoid communities in the Middle Triassic Qingyan Formation (or Xinyuan Formation) are discussed in the present paper on the basis of palaeoecology and palaeoenvironments in southern and central Guizhou during Triassic time.The flourish,burial and preservation of the Kueichousaurus faunas were constrained by the major global regressions during the Ladinian and confined to the semi-enclosed gulfs in the special sigmoidal shoal zones of platform margins.The palaeoecological maps of the study area during the Olenikian,Anisian and early Ladinian are drawn in this paper.Four trace fossil assemblages and ichnofacies are established,and the models for the distribution of the conodonts and pelecypods from shallow-water to deep-water environments are herein suggested.