caa a22 4500 386402353 CHVBK 20180307112204.0 cr unu---uuuuu 161130e198905 xx s 000 0 eng 10.1017/S0016756800022378 doi S0016756800022378 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800022378 Earliest skeletal fossils from Precambrian-Cambrian boundary strata, Elburz Mountains, Iran [Elektronische Daten] The lithological and biotic succession across the late Precambrian to early Cambrian interval is outlined for the Dalir and Valiabad successions of the Elburz Mountains of Iran. The Lower Dolomite Member contains an assemblage of phosphatic tubes and other poorly preserved remains. The succeeding Lower Shale Member bears macroscopic chuariamorphid algae. Early skeletal fossil diversity rises through the Middle Dolomite Member, with the successive appearance of Protohertzina anabarica, Cambrotubulus decurvatus and Anabarites trisulcatus, culminating near the top of the dolomites with the appearance of Purella sp., Maikhanella multa, Tiksitheca licis and circothecids. This succession is compared with lower to upper parts of the Nemakit-Daldyn Formation of Siberia. The overlying Upper Shale Member bears phosphatic beds at its base with allathecids and an uncoiled pelagiellid (?Aldanella sp.) that suggest comparison with lower Tommotian strata and the Precambrian-Cambrian boundary phosphorite event of southern and central Asia. A rich assemblage of molluscs appears high in the Upper Shale Member, including the Latouchella korobkovi group and the Pelagiella lorenzi group. The succession is broadly homotaxial with those from the Siberian Platform and Mongolia and those platforms bordering Gondwana (India, Kazakhstan, South China). Copyright © Cambridge University Press 1989 Hamdi B. Geological Survey of Iran, P.O. Box 13185-1494, Tehran, Iran Brasier M. D. Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, U.K. Zhiwen Jiang Yunnan Institute of Geology, Kunming, Yunnan, China Geological Magazine Cambridge University Press 126/3(1989-05), 283-289 0016-7568 126:3<283 1989 126 GEO https://doi.org/10.1017/S0016756800022378 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800022378 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hamdi B. Geological Survey of Iran, P.O. Box 13185-1494, Tehran, Iran NATIONALLICENCE 700 1- Brasier M. D. Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, U.K NATIONALLICENCE 700 1- Zhiwen Jiang Yunnan Institute of Geology, Kunming, Yunnan, China NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/3(1989-05), 283-289 0016-7568 126:3<283 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge