زیست چینه نگاری تریلوبیت های کامبرین پیشین تا کامبرین پسین در برش سیلو (جنوب کرمان)

برونزدهای نسبتاً محدودی از رسوبات کامبرین درشمال استان کرمان وجود دارد که حاوی آثار و بقایای تریلوبیت ها می‌باشند. یکی از مناطق مناسب جهت بررسیهای دیرینه شناسی برش سیلو در 17 کیلومتری جنوب شهر کرمان است. این برش 257 متر ستبری دارد. بررسیهای دیرینه شناسی در این برش منجر به شناسایی 12 جنس و 11 گونه از تریلوبیتها afghanocera lategenatum، anomocarella chainensis، a. sp.، blountia blountia، cheliedonocephalus farsia، iranoleesia pisiformis، kermanella lata lata، kermanella lata minuta، kermanella sp.، kobayashiella sp.، latouchella ? huckriedea، paragralous ? dahuensis، redlichia cf. chinensis، redlichia noetlingi، redlichia sp.، stoecklina spinosa و syspachelius sp. گردیده است. با توجه به جنس و گونه های موجود در این برش 4 زیست زون تجمعی مشخص گردید. این زیست زونها شامل redlichia noetlingi biozone، kermanella kuhbananensis biozone، iranoleesia pisiformis biozone و cheliedonocephalus farsia biozone است. سن این برش از series 2 اشکوب stage4 ( اواخر کامبرین پیشین)، تا guzhangian اوایل کامبرین پسین در نظر گرفته شده است.

biostratigraphy of early to late cambrian trilobites in silo section (south of kerman)

introduction ptychopariida were among the most dominant trilobite groups in the cambrian-ordovician. they range from the lower cambrian (stage 3) into the end of ordovician (hirnantian) and have worldwide occurrence. they are well-represented in middle cambrian rocks but often constitute a considerable part of many ordovician faunas. during the cambrian period, ptychopariida increased in diversity, particularly in the shallow-water oceans covering parts of pre-gondwana, such as turkey, australia, kazakhstan, korea, afghanistan, sweden, and iran. the cambrian trilobite species have been discovered in rare sites in iran. iranian cambrian trilobite taxa are generally absent in the universal measurement of cambrian biostratigraphy. cambrian strata from iran have been studied in several articles (ameri 2006, ameri 2010; ameri and dastanpour 2010; ameri and zamani 2012; ameri 2015, ameri and zamani 2016, wolfart and kursten, 1974; wolfart 1974a, b, huckride et al.1962 ;). this article concentrated on the cambrian trilobite taxa of south kerman (silo section).2-material and methodswe collected and studied the cambrian deposits, and their trilobite taxa were collected systematically in the silo section; only the in-situ samples were collected from the study section. the taxa prepared from this area are 160 trilobite taxa. further, the collected trilobites are entrusted to the graduate university of advanced technology [peg]. the specimens collected in the silo section are labeled as peg 01- peg0160. samples were taken from the rock layers, dense marl limestone, and limestone of the kuhbanan formation. this study describes the fauna from this locality for the first time.the extract of taxa was from marl limestone and limestone using a pneumatic pen. the trilobite samples were covered by ammonium chloride and used a loop lamp to uplift the contrast. the additional highlight from the north west quadrant was used in most specimens. taxa used a digital camera (nikon d90) with a 105mm objective lens to take a photo of trilobites.