caa a22 4500 386401853 CHVBK 20180307112202.0 cr unu---uuuuu 161130e19890901xx s 000 0 eng 10.1017/S0016756800022858 doi S0016756800022858 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800022858 Microfossils from silicified stromatolitic carbonates of the Upper Proterozoic Limestone-Dolomite 'Series', central East Greenland [Elektronische Daten] Silicified flake conglomerates and in situ stratiform stromatolites of the Upper Proterozoic (c. 700-800 Ma) Limestone-Dolomite ‘Series', central East Greenland, contain well preserved microfossils. Five stratigraphic horizons within the 1200 m succession contain microbial mat assemblages, providing a broad palaeontological representation of late Proterozoic peritidal mat communities. Comparison of assemblages demonstrates that the taxonomy and diversity of mat builder, dweller, and allochthonous populations all vary considerably within and among horizons. The primary mat builder in most assemblages is Siphonophycus inornatum, a sheath-forming prokaryote of probable but not unequivocally established cyanobacterial affinities. An unusual low diversity unit in Bed 17 is dominated by a different builder, Tenuofilum septatum, while a thin cryptalgal horizon in Bed 18 is built almost exclusively by Siphonophycus kestron. Although variable taphonomic histories contribute to observed assemblage variation, most differences within and among horizons appear to reflect the differential success or failure of individual microbial populations in colonizing different tidal flat microenvironments. Twenty-two taxa are recognized, of which two are described as new: Myxococcoides stragulescens n.sp. and Scissilisphaera gradata n. sp. Copyright © Cambridge University Press 1989 Green J. W. Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, U.S.A. Knoll A. H. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, U.S.A. Swett K. Department of Geology, University of Iowa, Iowa City, Iowa 52242, U.S.A. Geological Magazine Cambridge University Press 126/5(1989-09-01), 567-585 0016-7568 126:5<567 1989 126 GEO https://doi.org/10.1017/S0016756800022858 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800022858 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Green J. W. Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, U.S.A NATIONALLICENCE 700 1- Knoll A. H. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, U.S.A NATIONALLICENCE 700 1- Swett K. Department of Geology, University of Iowa, Iowa City, Iowa 52242, U.S.A NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/5(1989-09-01), 567-585 0016-7568 126:5<567 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge