caa a22 4500 386401527 CHVBK 20180307112200.0 cr unu---uuuuu 161130e198911 xx s 000 0 eng 10.1017/S0016756800006993 doi S0016756800006993 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800006993 Probable microbial origin of Ordovician (Arenig) phosphatic pebble coats (‘ Bolopora ') from North Wales, U.K [Elektronische Daten] Results are presented of thin-section, SEM, X-ray and microprobe investigations on problematical phosphatic accretions (‘ Bolopora ') from the St Tudwal's area of North Wales. The data supplement investigations made by H. J. Hofmann on the genesis of the accretions, and indicate a microbial (bacteriogenic) origin. The bacteriogenic pebble coats are of dahllite. Microbial relics suggest water-sediment interface-linked formation of the coatings under subtidal, and oxic to anoxic, environmental conditions during a sedimentary hiatus. Copyright © Cambridge University Press 1989 Niedermeyer R.-O Department of Geological Sciences, Ernst-Moritz-Arndt-University, Friedrich-Ludwig-Jahn Strasse, 17a, Greifswald 2200, German Democratic Republic Langbein R. Department of Geological Sciences, Ernst-Moritz-Arndt-University, Friedrich-Ludwig-Jahn Strasse, 17a, Greifswald 2200, German Democratic Republic Geological Magazine Cambridge University Press 126/6(1989-11), 691-698 0016-7568 126:6<691 1989 126 GEO https://doi.org/10.1017/S0016756800006993 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800006993 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Niedermeyer R.-O Department of Geological Sciences, Ernst-Moritz-Arndt-University, Friedrich-Ludwig-Jahn Strasse, 17a, Greifswald 2200, German Democratic Republic NATIONALLICENCE 700 1- Langbein R. Department of Geological Sciences, Ernst-Moritz-Arndt-University, Friedrich-Ludwig-Jahn Strasse, 17a, Greifswald 2200, German Democratic Republic NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/6(1989-11), 691-698 0016-7568 126:6<691 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge