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Evolutionary Stages of the Earliest Skeletal Fauna and Division and Correlation of the Precambrian‐Cambrian Boundary Strata
Author(s) -
Zhao Yue
Publication year - 1988
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1988.mp1003001.x
Subject(s) - fauna , stage (stratigraphy) , precambrian , paleontology , geology , third stage , geography , ecology , biology , training (meteorology) , meteorology
Through an analysis of the earliest fossils in the Precambrian‐Cambrian boundary beds in various parts of the world, especially in the Yangtze and Siberia platforms, the author has found that the evolution of the earliest skeletal animals may be divided from older to younger into three stages. The first stage (the Anabarites‐Protohertzina fauna) is represented by the Anabarites‐Protohertzina zone of the Meishucunian Stage in the Yangtze platform and the A. trisulcatus and P. cristata zones of the Manykayn Stage in Siberia. The second stage (the earliest orthothecimorphid and mollusc fauna) is represented by the Paragloborilus‐Siphogonuchites zone of the Meishucunian Stage and the Aldanocyathus sunnaginicus zone of the Tommotian Stage. The third stage (the earliest hyolithimorphid and lapworthellid fauna) is represented by the Sinosachites zone of the Meishucunian Stage and the D.regularis and D.lenaicus zones of the Tommotian Stage. The three evolutionary stages can be used as a criterion for worldwide correlation.