TITLE:
Reineckeiidae (Ammonoidae) Family of the Dalichai Formation in Damghan Area (East Alborz), Iran
AUTHORS:
Marjan Zadesmaeil, Mahmoud Reza Majidifard, Seyed Hamid Vaziri, Davood Jahani
KEYWORDS:
Jurassic, Reineckeiidae, Palaeobiogeographically, Dalichai Formation, Alborz
JOURNAL NAME:
Open Journal of Geology,
Vol.7 No.6,
June
30,
2017
ABSTRACT: The
present study is concerning the systematic descriptions of the Middle Jurassic
(Callovian) ammonite fauna from the Damghan Area (eastern Alborz) and contains
a rather rich ammonite fauna. The described ammonites come from the Middle part
of the Dalichai Formation, consisting of an alternation of green marl, grey
limestone and marly limestone. In this research, the biostratigraphy of these
rocks is discussed with special emphasis on the abundant ammonite fauna
(Reineckeiidae family). Altogether, 74 specimens of ammonites belonging to 14
species, 3 genera, 3 sub genera from Reineckeiidae family are described.
Palaeobiogeographically the ammonite fauna is closely related to that of the
sub-Mediterranean Province of the northwestern Tethys. The ammonites represent
four zones, i.e. Rehmannia (Loczyceras) cf. segestena (Anceps Zone), Rehmannia (Loczyceras) reissi (Anceps Zone), Rehmannia (Loczyceras) rehmanni (Anceps Zone), Rehmannia (Loczyceras) sequanica densicostata (Coronatum Zone), Reineckeia (Tyrannites) convexa (Gracilis Zone), Reineckeia (Tyrannites) pictava (Gracilis Zone), Reineckeia (Reineckeia) anceps
anceps (Anceps
Zone), Reineckeia (Reineckeia) anceps
elmii (Anceps
Zone), Reineckeia (Reineckeia) cf. fehlmani (Anceps Zone), Reineckeia (Reineckeia) nodosa (Athleta Zone), Collotia cf. multicostat (Anceps Zone), Collotia cf. gaillardi (Coronatum Zone), Collotia cf. oxyptychoides (Athleta Zone), Collotia cf. collotiformis (Athleta Zone).