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Ne Iran, Kopet-Dagh) and Their Biostratigraphic and Palaeobiogeographic Importance Rivista Italiana di Paleontologia e Stratigrafia (Research in Paleontology and Stratigraphy) vol. 125(2): 317-331. July 2019 SOME MICROFOSSILS (DASYCLADALES, BENTHIC FORAMINIFERA, SPONGES) FROM THE UPPER JURASSIC MOZDURAN FORMATION (NE IRAN, KOPET-DAGH) AND THEIR BIOSTRATIGRAPHIC AND PALAEOBIOGEOGRAPHIC IMPORTANCE FELIX SCHLAGINTWEIT1, ZOHREH KADIVAR2 & KOOROSH RASHIDI2 1Lerchenauerstr. 167, 80935 München, Germany. E-Mail: [email protected] 2Department of Geology, Yazd University, Safaieh, Post Box 89195-741 Yazd, Iran. E-mail: [email protected], [email protected] To cite this article: Schlagintweit F., Kadivar Z. & Rashidi K. (2019) - Some microfossils (Dasycladales, benthic foraminifera, sponges) from the Upper Jurassic Mozduran Formation (NE Iran, Kopet-Dagh) and their biostratigraphic and palaeobiogeographic importance. Riv. It. Paleontol. Strat., 125(2): 317-331. Keywords: Upper Jurassic; calcareous algae; foraminifera; sponges; shallow-water carbonates; taxonomy. Abstract. The Mozduran Formation represents mainly carbonatic shallow-water deposits from the Kopet-Dagh basin of northeast Iran. Longtime considered to be of exclusively Late Jurassic (Oxfordian-Kimmeridgian) age, its ranging into the Early Cretaceous has been demonstrated in recent times. The micropalaeontological inventory and bio- stratigraphic data however, are still poorly constrained. In the present contribution, some taxa of Dasycladales [Camp- belliella striata (Carozzi), Montenegrella florifera Bernier, Petrascula bugesiaca Bernier, Petrascula cf. bursiformis (Éttalon), Triplo- porella sp.], benthic foraminifera [Neokilianina rahonensis (Foury & Vincent), Spiraloconulus suprajurassicus Schlagintweit], and sponges (Paronadella? sp., Neuropora lusitanica G. Termier & H. Termier, Thalamopora sp.) are reported. Some taxa are reported for the first time from this formation, some even for the first time from Iran. The identified assemblage is assigned to the Tithonian, although a late Kimmeridgian age for the lowermost part of the section studied is possible. A palaeobiogeographic restriction to the former Neotethysian margin might be possible for the two Petrascula species. INTRODUCTION bian and Eurasian plates (e.g., Berberian & King 1981; Aghanabati 2004). The closing of the Kopet- The Kopet-Dagh mountain range represents Dagh basin happened diachronous with emersion a north-east-trending about 650 km long and about processes advancing from east to west (Lyberis 200 km wide active fold belt at the border betwe- & Manby 1999). Like the Zagros Mountains, the en Iran and Turkmenia, east of the Caspian Sea. Kopet-Dagh was folded into long linear NW-SE In Mesozoic and Cenozoic times, more than 7000 trending folds during the last phase of the Alpine meters of mostly Jurassic to Miocene sediments orogeny in Plio-Pleistocene times. (carbonates, siliciclastics and evaporites) have been The major reservoir in the giant Khangiran deposited in the eastern part of the basin (Afshar- gas field in the Kopet-Dagh basin is a porous do- Harb 1979; Berberian & King 1981; Golonka 2004). lomitic interval of the widely distributed Upper These sediments were deposited in a marginal sea Jurassic Mozduran Formation (Afshar-Harb 1994). of the northern Tethys ocean, one of the so-called The stratigraphy of the Mozduran is treated con- Peri-Tethysian basins (Brunet & Cloething 2003, troversially in the literature. The objectives of the for an overview), that became close with the sutu- present contribution are new data on the micro- ring of northeast Iran to the Eurasian Turan Plate paleontology (benthic foraminifera, dasycladalean resulting from the convergence between the Ara- algae, sponges), and biostratigraphy of one section of the Mozduran Formation located in the central Received: September 20, 2018; accepted: February 14, 2019 part of the Kopet-Dagh basin. 318 Schlagintweit F., Kadivar Z. & Rashidi K. Fig. 1 - Tectonic-structural map of Iran (modified from Zanchi et al. 2003) (left) and location map of the studied section. GEOLOGICAL SETTING BIOSTRATigRAPHY OF THE MOZDURAN FORMATION The Mozduran Formation is composed mainly of medium- to thick-bedded dark lime- The stratigraphy of the Upper Jurassic Moz- stones, dolomites, with shale and sandstone inter- duran Formation is treated controversially in the liter- calations. In the eastern part of the basin, where ature. In many contributions, it is assigned to the late it is shallower, the Mozduran Formation displays Callovian/Oxfordian-Kimmeridgian interval (e.g., a higher grade of dolomitization and reduced Kavoosi et al. 2009; Robert et al. 2014; Aghaei et al. thickness compared to the western part. The 2018). Majidifrad (2003, p. 39) mentions the dasycla- Mozduran Formation rests with conformable con- dale Clypeina jurassica [= Aloisalthella sulcata (Alth); see tact on the Chaman Bid Formation and is overlain Granier & Lethiers 2018] from the lower part of the by the reddish siliciclastic Shurijeh Formation se- Mozduran Fm. Based on the age of the underlying parated by a paraconformity surface (Aghanabati Chaman Bid Formation (obtained from ammonites 2004). The upper boundary of the Mozduran For- of the eudoxus zone) he concludes a Kimmeridgian- mation to the Lower Cretaceous Shurijeh Forma- ?Tithonain age for the Mozduran Fm. Whether or tion is erosional according to some authors (Bucur not the mentioned C. jurassica belongs to this taxon et al. 2013a; Aghaei et al. 2018) whereas others however remains speculative. Two illustrated speci- considered it to be transitional (e.g., Nabavi 1976; mens of “C. jurassica” from the upper part of the Majidifard 2003). Mozduran Fm. (Majidifard 2003, pl. 2.8A-B) in fact The studied section of the Mozduran For- belong to Rajkanella bartheli (Bernier). The foramini- mation is located in the central part of the Kopet- fer illustrated as Pseudocyclammina maynci (pl. 2.6F) Dagh basin approximately 60 km north to north- from the middle part of the Mozduran Fm. in fact west of Mashhad city (Fig. 1). The thickness of the belongs to Anchispirocyclina lusitanica (Egger). Kadivar Mozduran Formation here is 268 m, composed of et al. (2017, fig. 7) illustrated specimens ofAlveosepta medium- to thick-bedded gray limestones, black jaccardi (Schrodt) [= indicated as Pseudocyclammina litu- marly limestones and some intercalations of black us (Yokoyama)] and Frentzenella involuta (Mantsurova) shales and sandstone (Fig. 2). In the present study, (= indicated as Coscinoconus sp.). In the case study, a total of 60 samples mainly from limestones were this would indicate a late Oxfordian-Kimmeridgian gathered. The Greenwich coordinates of the sec- and Tithonian age respectively (e.g., Bassoullet 1997; tion base are N 36°34’27.91” and E 60°0’19.35”. Rigaud et al. 2013). Microfossils from the Upper Jurassic Mozduran Formation (NE Iran) 319 Fig. 2 - Studied section of the Mozduran Formation ~60 km north to north-west of Mashhad city with distri- bution of the microfossils described herein (Dasycla- dales, benthic foraminifera, sponges). Among the microfossils reported in the pres- age from the Mozduran Formation. In consequence ent study the following are worth mentioning: this means, in a trivial manner, that a general age * Neokilianina rahonensis (Foury & Vincent). cannot be indicated per se for any section of the Stratigraphy: Kimmeridgian-lowermost Tithonian Mozduran Formation. Instead each section that has (Bassoullet 1997) to be investigated individually to obtain data for its * Montenegrella florifera Bernier. Stratigraphy: range. For the section studied herein the Tithonian Tithonian-Berriasian (Bucur 1999; for the occur- (maybe latest Kimmeridgian for the basal part) is rence in the Berriasian see comments in the Sys- well documented. Whether or not the section also tematic Part) comprises parts of the Berriasian is not document- * Petrascula bursiformis (Éttalon). Stratigraphy: ed by any kind of (micro)fossils (Fig. 2). Kimmeridgian-Tithonian (Bucur 1999) * Petrascula bugesiaca Bernier. Stratigraphy: Ti- thonian (Bucur 1999). MATERIAL AND METHODS An early Tithonian age for the top of the Chaman Bid Formation at its type-locality (Schairer The present study is based on micropalaeontological analysis et al. 1999) evidences the diachronous character of of thin-sections coming from the Mozduran Formation. The speci- these formations and their boundaries. Bucur et al. mens illustrated in the present contribution comprise eight thin-sec- tions made from four rock samples: M4, M4-1, M6, M8, M9, M9-1, (2013a) reported microfossils (benthic foraminifera, M9-2, and M9-3. They are deposited at the Ardakan Payame Noor algae) of typically Berriasian (in part Valanginian?) University, Iran, collection Rashidi, under these numbers. 320 Schlagintweit F., Kadivar Z. & Rashidi K. Fig. 3 - Benthic foraminifera from the Upper Jurassic Mozduran Formation, Iran. 3.1-3.2) Neokilianina rahonensis (Foury & Vincent). Sample M6. 3.3-3.4) Spiraloconulus suprajurassicus Schlagintweit. Note agglutinated ooids in the test and Nautiloculina sp. Sample M8. YSTEMATIC ALAEONTOLOGY 2014 Neokilianina rahonensis (Foury & Vincent) - Schlagintweit, p. 28, S P fig. 1d (re-illustration from Gollestaneh, 1965) [cum syn.] Benthic foraminifera Material: Several specimens from sample M6. Phylum FORAMINIFERA Orbigny, 1826 Remarks. N. rahonensis was described by Gol- Class LOBOTHALAMEA Pawlowski, G lestaneh (1965) as K. iranica from the Kimmeridgian Holzmann & Tyszka, 2013 of the Zagros fold and thrust belt. According
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