in Jurassic and Cretaceous Stratigraphy

Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321
Biozone B: This biozone is represented by abun-
dant ammonites, which occur in the upper part of the
member and which are similar to the ammonites
described by Spath (1970) from northern Iraq.
According to Spath (1970), these ammonites indicate
the upper part of the Lower Tithonian and the lower
part of the Upper Tithonian. However, at top of this
member Richterella richteri is common, which
indicates Lower Tithonian (Cecca, 1986). Therefore,
the age of this assemblage is older than that of
Richterella. The assemblage comprises the following
taxa:
Pseudolissoceras zitteli, Glochiceras sp., Oxy-
lenticeras cf. lepidum, Phanerostephanus subsenex,
Nothostephanus sp., Phanerostephanus sp., and Nan-
nostephanus cf. subcornutus.
Biozone C: This biozone is indicative of the
Lower Tithonian Fallauxi Zone and is characterized by
abundant Richterella richteri and Richterella sp.
Sublithacoceras sp. is rare.
Member 5 (78 m): Trace fossils include Gyro-
chorte.
Member 6 (42 m): No index fossils were re-
corded.
Member 7 (658 m): Based on its stratigraphic
position, a Tithonian-?Neocomian age of the member is
assumed, although no index fossils were recorded.
Mozduran Formation: Massive, light-grey lime-
stones (wackestone to grainstone), which overlie the
Chaman Bid Formation with conformable but sharp
contact.
Key words: Tithonian; Ammonites; Chaman Bid;
Koppeh Dagh
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