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Early Silurian (Llandovery) Trilobite Fauna from Kopeh-Dagh, North East Iran

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Early Silurian (Llandovery) Trilobite Fauna from Kopeh-Dagh, North East Iran Journal of Sciences, Islamic Republic of Iran 31(2): 155 - 164 (2020) http://jsciences.ut.ac.ir University of Tehran, ISSN 1016-1104 Early Silurian (Llandovery) Trilobite fauna from Kopeh-Dagh, North East Iran H. Ameri* Department of Ecology, Institute of Science, High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Islamic Republic of Iran Received: 17 February 2018 / Revised: 29 September2019 / Accepted: 13 November 2019 Abstract The aim of this study is to analyze the assemblage of trilobites in the Silurian sequences of Iran by exploring stratigraphic section of the Silurian Niur Formation (Asadli section). Based on comprehensive field studies and laboratory investigations three Trilobite genera were identified in the study area including Calymene blumenbachii, Gravicalymene convolva, Dalmanites brevigladiolus and Calymene sp. according to this trilobite assemblage a Rhuddanian to Telychian stages (Llandovery) is suggested for deposition of the study strata. The recognized trilobite fauna will be used as a base for future geological studies on the Silurian strata in Kopeh-Dagh Basin. This is the first report of trilobites from the Silurian (Llandovery) Niur Formation in Asadli section, north- east, Iran. Keywords: Trilobite; Calymene; Biostratigraphy; Silurian; Iran. Llandovery trilobite taxa of Kopeh Dagh (Asadli Introduction section). Calymenina were among the most dominant trilobite Although Silurian strata were previously reported groups in the Lower Paleozoic. They range from the well from several regions of Iran, such as Kerman [1], Tremadoc into the Devonian and have world-wide Dajman [2], Isfahan [3], Tabas [4-6], the stratigraphy occurrence. They are well-represented in Tremadoc and fauna of Kopeh Dagh region remains inadequately rocks but often constitute a significant part of many recognized. Silurian strata were first reported from the Ordovician and Silurian faunas. During Llandovery Kopeh Dagh region by [7], done the first assessment on times, Calymenidae underwent a dramatic increase in the Paleozoic stratigraphy of Iran. They were correlated diversity, particularly in the shallow-water oceans the Silurian rocks of South East of Asia and the near covering parts of Gondwana, such as, Turkey, Poland, East. Brice [8] briefly outlined the Silurian and Kazakhstan, Japan, Italy, Sweden and Iran. The Silurian Devonian stratigraphy of the area. Cocks [9] studied and trilobites have species have been discovered in rare sites described 23 taxa of brachiopods at the western Kopeh in Iran. Alas, Iranian Llandovery trilobite taxa are Dagh region. The Lower Paleozoic strata from Kopeh generally invisible in universal measurement of Silurian Dagh region were studied by: [10-16] and more recent biostratigraphy. This article concentrated on the surveys by Ameri et al. indicate that the Robat-e- * Corresponding author: Tel: +09131984699; Fax: +983436226617; Email: [email protected] 155 Vol. 31 No. 2 Spring 2020 H. Ameri. J. Sci. I. R. Iran Gharebil secttion is also rich in trilobites [31]. The goals Geographical and Geologicaal setting of this article are to 1) presented summary lithologgical Asadli section is part of the Saluk Mountains on the description of the Asadli section, and 2) recognition and southern side of the Asadli Valley, about 35 km south of describe the trilobites. Bojnord city at the Kopeh Dagh basin (Fig. 1). These Mountains trend northeast–southwest and development Figure 1. Position of the Asadli area in the northeast of Iran, study section and geological map. 156 Early Silurian (Llandovery) Trilobite fauna from … about 20 km. They are bounded by the Firuzeh fault at Materials and Methods the north and the Solook fault system and Shiroyeh fault The Silurian strata were studied and their trilobites at the south. Asadli section is placed in the southwest of taxa, collected systematically in the Asadli section. the Sarinow Mountain. In this area the Cambrian to Only the in situ fossils were collected from the study Jurassic deposits cropped out. In the study area (Fig. 1), area. The taxa collected from this area are about 45 the Cambrian strata have subdivided into the Barout trilobite taxa. The collected trilobites are deposited in Formation, partly Zaigon and Lalun Formations. The the Graduate University of Advanced Technology, Cambrian - Ordovician boundary is faulted. The [PEG]. Ordovician strata contained; dark sandstone, olive green The evoked of taxa were from marl limestone and shale, minor sandy limestone and volcanic (andesite to limestone using a pneumatic pen. The trilobite samples basalt), Qelli Formation (Sandbian- Hirnantian). were masked by ammonium chloride and using loop- Silurian sequence in this area comprising of more than lamp to raise the contrast. In most specimen, extra 300 m of argillites, limestone and siltstones, highlight from the North West quadrant was used. for Various Ages are proposed for deposition of the The take photo of trilobites taxa were using a digital Silurian Niur Formation in different areas by many camera (Nikon D90) with a 105mm objective lens. authors on the basis of different fossil groups. They are: Aeronian- Sheinwoodian by conodont; in the Masuleh (western Alborz) [17], Rhuddanian to Homerian, by Results and Discussion brachiopods and corals, [9], and as Rhuddanian to Aeronian by conodont , in Rebate Gharebil (western Systematic Paleontology Kopeh Dagh region[18], Aeronian by brachiopods [14] , Appraisement, terminology, and abbreviations are and as Rhuddanian to Telychian, by Acritarchs and derived from [20-24] based on Ameri [24], (Fig. 3). chitinozoa in Kuh-e-Saluk [19] and as Aeronian, by brachiopods and cephalopod ,in Gerdu Valley section , Family; Calymenidae Milne Edwards 1840 [16]. The lower contact of the Niur Formation is Subfamily; Calymeninae Milne Edwards 1840 conformable and transitional with the underlying Qelli Genus; Calymene Brongniart, 1822 Formation and in this section is disconformably overlain Pl.1, [a-c and h], Pl.2, [a-c], Pl.3, [a, g] with Devonian red and white sandstone and shale of Padeha Formation. Type species; Calymene blumenbachii Brongniart, 1822 The Asadli section 1950. Calymene boettneri n. sp. Harrington, p. 73-76, The Asadli section is located about 35 km south of pl. 1, Figs. 1-3. Bojnord city, at 2 km south east of the Asadli village, at Material. One complete specimens, six cranidial, geographic coordinates of 37°19’38” N, 57°20’04” E and four pygidium (Fig. 1). More than 300 m of Silurian deposits measured Description: Glabella outstanding high over genal that can be subdivided into four lithofacies (Fig. 2): and skeleton fine in foreside of them, frontal lobe Member 1: comprising of more than 95 m of gray to slanting steeply onward, with 3 placenta of sidelong black sandy argillite with several interbeded of lobes, 1L and 2L derived by superficial linear furrows, graptolitic argillite and oolitic ironstone levels in the all a partly outstanding. 2L lobes papillate; eye lobes middle part. opposite 2L glabellar lobes; Preglabellar groove narrow, Member 2: consisting of 35 m of bedded limestones profound; frontal edge equally outstanding, center of and argillites. They contain cephalopod, trilobite and frontal lobe of central body. Thorax with 13sectors, brachiopods. pygidium with six perfect axial rings and six profound, Member 3: consisting of 25 m of bedded limestones pleural grooves, which develop to edge of borderless intercalating with siltstone, and argillites, with no pleural zones, Pygidium is slightly minor than double as identified fossils. Width as length. Axis is somewhat, less than moiety the Member 4: comprising of about 150 m of bedded pygidial width, is strongly outstanding (sag.) has seven limestones and argillites, with a level of 30 m thick, or 8 axial rings. All axial rings except the final bioclastic limestone in its upper part. This member determined posteriorly by full ring grooves which are contains cephalopod, trilobite and scattered weakest; last ring groove not continues; final axial brachiopods. The Silurian deposits are overlain segment rounded. Axial groove decidedly impressed, unconformeably by Padeha Formation (lower weakest posteriorly. Inner segment of pleural zone falls Devonian). steeply from axial groove, outer part becomes vertically 157 Vol. 31 No. 2 Spring 2020 H. Ameri. J. Sci. I. R. Iran Figure 2. Biotratigraphical log of the Asadli section (Llandovery) in the South side of Asadli village,, showing the location of the trilobite taxa discussed in the text Figure 3. Terminology and measurement derived on the trilobites, portions of cranium and pygidium oblique. There are 5 distinctly impressed pleural slightly effaced are slightly major impressed again grooves which are best marked at their mid-length and directly, adjoining to axiall groove, 15 interpleural almost reach lateral edge. Interpleural grooves are groove rings on outside of an exsagitally directed ridge 158 Early Silurian (Llandovery) Trilobite fauna from … Plate 1. (a- c) Calymene blumenbachii (a), (R431) 2 (b) (R431) 2 (c), ( R431) 3 (d), Gravicalymene convolva (R461) 2 .(e, f) Dalmmaanites brevigladiolus .,(e) (R473) 2, (f) (R474) 2, (g), Calymene sp., (.R440) 3,(h) Calymene blumenbachii, (R450) 3. which maybe demonstrates of frontal pleural band of 16 Argentina), by contain, a taller, a not truncated glabella, pleura and limited the postaxial part. a forward- curving occipital groove, a slightly less Remarks. Harrington1950 provided perfect, raised pygidial
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