Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Systematic and Taphonomic Study of Trichophycus pedum at the Soltanieh Type Section in SE of Zanjan

Document Type : Original Research Paper

Authors
1 Faculty of Sciences, Geology Department, Urmia University, Urmia, Iran
2 Geology Department, Islamic Azad University, North Tehran Branch, Tehran, Iran
3 Geology Department, School of Earth Sciences, Shahid Beheshti University, Tehran,, Iran
4 Geology Department, School of Earth Sciences, Shahid Beheshti University, Tehran, Iran
Abstract
       Diversification of trace fossils is due to the animal activity in the sedimentary environments. In addition to the variety of the behavior of animals, the mode of preservation of trace fossils leads to diversification of ichnofossils. Trichophycus pedum ichnospecies which is an index trace fossil of basal Lower Cambrian in Global Stratotype Section (GSS), has been recognized for the first time from the uppermost lower shale member of Soltanieh Formation and has been systematically studied. These studies suggest that the type of preservation of Trichophycus pedum led to polymorphism of this taxon, which in turn arises from the ethologically controlling factors and physical structures of sedimentary environments. Polymorphism of these ichnofossils leads to the introduction of the new style of preservation and sedimentary environments.
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Buatois,L.A., and Mangano,M.G., 2004 - Terminal Proterozoic-early Cambrian ecosystems:ichnology of the Puncoviscana Formation, northwest Argentina. Fossils and Strata, No.51,p.1-16.Canada.
Crimes,T.P., 1987-  Trace fossils and correlation of Late Precambrian and Early Cambrian  strata.Geological Magazine 124 ,  p. 97-119.
Crimes,T.P., 1992 - Changes in the trace fossil biota across the Proterozoic-Phanerozoic boundary .Journal of the Geological Society ,London 149,p. 637-646.
Droser,M.L., Jensen,S., Gehling,J.G., Myrow,P.M., and Narbonne,G.M., 2002 - Lowermost Cambrian ichnofabrics from the Chapel Isand Formation, Newfounland :Implication for Cambrian substrates:Palaios, 17,p.3-15 .
Geyer,G., Uchman,A., 1995- Ichnological assemblage from the Nama Group (Neoproterozoic- Lower Cambrian) in Namibia and the Proterozoic –Cambrian boundary problem revisited . Beringeria Special issue, 2,p.175-202.
Jensen,S. and Grant,S.W.F., 1998 - Trace fossils from the Dividalen Group,northern Sweden :implications for Early Camberian biostratigraphy of Baltica.Norsk Geologisk Tidsskrift, 78,p.305-317.
Jensen,S., Droser,M.L., Gehling,J.G., 2005- Trace fossil preservation and the early evolution of animals Palaeogeography, Palaeoclimatology, Palaeoecology, 220, p.19-29.
MacEachern,J.A. and Pemberton, S.G., 1994- Ichnological aspects of Incised-Valley fill system from the Viking Formation of Western Canada sedimentary Basin,Alberta,Canada SEPM Specialpublication No.51,p129-157.
Miller,S.A., Dyer,C.B., 1878- Contribution to Paleontology Journal Cincinati Society .Natural History 1:24-39
Seilacher,A., 1955- Spuren und Fazies im Unterkambrium. In: SCHINDEWOLF,O.H.&SEILACHER,A.(eds) Beitrage zur Kenntuis des Kambrium in der Salt Range (Pakistan).Akad.Wiss.Lit.Mainz.,Abh.math-naturwiss. K1.10, p.11-143
Seilacher,A., 1970- Cruziana stratigraphy of “non-fossiliferous”Palaeozoic sandstones. In: Crimes, T.P, Harper, J.C. (eds.).Trace Fossils , p. 447-476.
Seilacher,A., 1983- Upper Paleozoic trace fossils from the Glif Kebir-Abu Ras area in southwestern Egypt.-Journal of.African EarthSciences 1, p.21-34.
Skinner,.E.S., 2005- Taphonomy and depositional circumstances of exceptionally preserved fossils from the Kinzers Formation(Cambrian), southeastern Pennsylvania Palaeogeography,Palaeoclimatology,Palaeoecology , 220 ,p.167-192.
Taylor,A.M., Goldring,R., 1993- Description and analysis of bioturbation and Ichnofabric.Journal of the Geological Society (London) 150,p141-148.
Taylor,A.M., Goldring,R., Gowland ,S., 2003- Analysis and application of ichnofabrics Earth-Science Reviews 60,p227-259.