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Lithostratigraphic revision of the middle Cambrian (Series 3) and upper Cambrian (Furongian) in northern and central Iran
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
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2014 (English)In: Newsletters on stratigraphy, ISSN 0078-0421, Vol. 47, no 1, 21-59 p.Article in journal (Refereed) Published
Abstract [en]

Studies of stratigraphic sections of Cambrian rocks exposed in the central and eastern Alborz Mountains and in the Tabas area indicate characters that demand a revision of the upper Lower Cambrian (Series 2-Series 3 boundary interval) through lowermost Ordovician lithostratigraphy of northern and central Iran. Emended units include the Lalun and the (traditional) Mila Formation, the latter now being subdivided into the Fasham Formation (new; formerly "White Quartzite", "Top Quartzite", or "Basal Quartzite"), the Deh-Sufiyan Formation (new; essentially equivalent to the informal members 1 and 2 of the traditional Mila Formation), the Deh-Molla Formation (new; essentially equivalent to the informal members 3 and 4 of the traditional Mila Formation). Together with the lower Ordovician Lashkerak Formation and an unnamed formation, these formations constitute the Mila Group. Correlation of these lithostratigraphic units within Iran and intercontinentally are discussed with respect to both biostratigraphic and sequence stratigraphic data. It is obvious that the Lalun Formation records not only a (sub)globally recognisable regressive event towards the end of the Early Cambrian, but, in association with the Fasham Formation, also provides evidence for the subsequent earliest Middle Cambrian transgression that finally led to the establishment of a carbonate platform that persisted throughout the remainder of the Cambrian Period, generating the deposits of the Deh-Sufiyan and Deh-Molla formations of the Mila Group.

Place, publisher, year, edition, pages
2014. Vol. 47, no 1, 21-59 p.
Keyword [en]
Lalun Formation, Mila Group, Fasham Formation, Deh-Sufiyan Formation, Deh-Molla Formation, Middle Cambrian, Furongian, lithostratigraphy, Alborz Basin
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Geology
Identifiers
URN: urn:nbn:se:uu:diva-227901DOI: 10.1127/0078-0421/2014/0039ISI: 000336443000002OAI: oai:DiVA.org:uu-227901DiVA: diva2:731711
Available from: 2014-07-02 Created: 2014-07-01 Last updated: 2017-12-05Bibliographically approved

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Geyer, Gerd

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