. Bulletin of the British Museum (Natural History), Geology. 426 LOWER PALAEOZOIC STRATIGRAPHY the succession of the two formations is overturned. The Seydisehir Formation comprises the Seydisehir Shales, a group of silty shales and quartzites more than 1000 metres thick, with a small thickness of Upper Gre3rwackes at the top. The few shelly fossils in the shales are mostly asaphid and calymenid trilobites of Tethyan type, together with graptolites, cephalopods and brachiopods that indicate an Arenig age. The uppermost Palaeozoic strata, the Sobova Formation, succeed the Seydisehir Formation c
. Bulletin of the British Museum (Natural History), Geology. 426 LOWER PALAEOZOIC STRATIGRAPHY the succession of the two formations is overturned. The Seydisehir Formation comprises the Seydisehir Shales, a group of silty shales and quartzites more than 1000 metres thick, with a small thickness of Upper Gre3rwackes at the top. The few shelly fossils in the shales are mostly asaphid and calymenid trilobites of Tethyan type, together with graptolites, cephalopods and brachiopods that indicate an Arenig age. The uppermost Palaeozoic strata, the Sobova Formation, succeed the Seydisehir Formation conformably and comprise the Sobova Limestone (o to lo metres thick), followed by a small thickness of shales which passes laterally into red sandstones southwards near Taras^i. At its type locality, south of Beysehir, the Sobova Lime- stone contains a trilobite fauna of predominantly Baltic-Scandinavian affinities that includes Agerina, Carolinites, Illaenus, Niohe and Symphysurus. A few Tethyan genera occur also, and the fauna is of Arenig age. Over the whole region the sub- stratum of older Palaeozoic rocks is overlain unconformably by Mesozoic limestones. V. REFERENCES Blumenthal, M. 1947. Geologic der Taurusketten im Hinterland von Seydisehir und Beysehir. Maden Tetkik Arama Enstit. Yayinl., Ankara, Ser. D, 2 : 1-242, 24 figs. Dean, W. T. 1967. The distribution of Ordovician shelly faunas in the Tethyan region. In " Aspects of Tethyan Biogeography " (ed. C. G. Adams & D. V. Ager), Systematics Assoc. Publn, London, 7 : 11-44, 5 figs. Haude, H. 1969. Das Alt-Palaozoikum—Prakambrium bis Silurium—in der Tiirkei. Zenibl. Geol. Paldont., Stuttgart, Teil 1 : 702-719. Jackson, D. E. 1962. Graptolite zones in the Skiddaw Group in Cumberland, England. /. Paleont., Menasha, 36 : 300-313, 4 figs. MoNOD, O. 1967. Presence d'une faune Ordovicienne dans les Schistes de Seydisehir a la base des calcaires du Taurus Occidental. Bull. Miner. Res. Explor. Inst. Ankara, 69 : 7
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