Th Servais and J Maletz (1994)
Acritarch/graptolite biostratigraphy and correlation of the Llanvirn (Ordovician) between the Condroz area (Belgium),the Rheinisches Schiefergebirge (western Germany),and the Island of Rügen (Baltic Sea)
Meuse-Rhine Euregio Geologists Meeting, vol. Krefeld,27th & 28th May,1994 p. 11.
13438, 146, 155, N, Lg, CALCOND, ORD, PALMIC, PAL, STRA
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