Document Type : Original Research Paper

Authors

1 M.Sc., Faculty of Sciences, University of Zanjan, Zanjan, Iran

2 Associate Professor, Faculty of Sciences, University of Zanjan, Zanjan, Iran

3 Ph.D., Department of Geology, Science and research branch, Islamic Azad university, Tehran, Iran

4 Assistant Professor, Faculty of Sciences, University of Zanjan, Zanjan, Iran

Abstract

Soltanieh Formation comprises seven informal submembers as alternation of dolomites and shales, more than 1110 meters in thickness, was surveyed in the Seyedkandi section, 32 km southwest of Zanjan, northwest Iran. These submembers were subdivided as lower dolomite, lower shale, second dolomite, second shale, third dolomite, upper shale and upper dolomite, respectively. Based on ichnological data from 109 specimens, 23 ichnogenera and 42 ichnospecies have been recognised.
The abundance of trace fossils is very high in the second shale submember, so that 99 specimens were collected from this rock unit. Ichnofossil data from the studied section showsthat the Neoproterozoic-Cambrian boundary is located in the 8 m above the base of second dolomite submember in the studied section, where the first occurrence of Treptichnus pedum was been recorded.

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