. Bulletin of the British Museum (Natural History), Geology. 110 H. P. SCHONLAUB ORDOVICIAN/SILURIAN BOUNDARY SOU FEISTRITZ- GRABEN STEINWEN DER-HUTTE WASSERFALL NOLBLING- GRABEN z < D _l 0) TELYCHIAN EifJE,T" AERONIAN "."nau' RHUDD ANIAN a"m,"«'"" z o Q o: o HIRNANTIAN GAMACHIAN RAWTHEYAN 5 m [~] •4 U 3 P 2 |. Fig. 2 Comparative sections through the Carnic Alps near the Ordovician-Silurian boundary. The Plocken Formation has a thickness of between 1-5 and 9m, the latter occurring on the southern slope of Mount Rauchkofel. Based on the occurrences of
. Bulletin of the British Museum (Natural History), Geology. 110 H. P. SCHONLAUB ORDOVICIAN/SILURIAN BOUNDARY SOU FEISTRITZ- GRABEN STEINWEN DER-HUTTE WASSERFALL NOLBLING- GRABEN z < D _l 0) TELYCHIAN EifJE,T" AERONIAN "."nau' RHUDD ANIAN a"m,"«'"" z o Q o: o HIRNANTIAN GAMACHIAN RAWTHEYAN 5 m [~] •4 U 3 P 2 |. Fig. 2 Comparative sections through the Carnic Alps near the Ordovician-Silurian boundary. The Plocken Formation has a thickness of between 1-5 and 9m, the latter occurring on the southern slope of Mount Rauchkofel. Based on the occurrences of the Hirnantia faunal assemblage at the Cellon, Hoher Trieb and Uggwa sections, a late Ashgill age, the Hirnan- tian Stage, is deduced for the Plocken Formation. This is in agreement with earlier reports of Glyptograptus cf. persculptus (Salter) from the 'Feistritzgraben' section in the Western Kara- wanken Alps (Jaeger et al. 1975). We correlate this level with the basal Plocken Formation in the Carnic Alps, although the lithologies are slightly different. The Base of the Silurian On the carbonate shelf which was already shallow in pre-Hirnantian times the shallow water carbonate facies was re-established in the Silurian. However, in this facies disconformities with distinct karst surfaces are widely developed and depositional hiatuses are well known. The relief may be several cm or more. In particular this phenomenon can be seen on top of the carbonate mounds of the Wolayer Limestone which apparently became subaerially exposed from the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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