. Bulletin of the British Museum (Natural History), Geology. 84 ORDOVICIAN TRILOBITE FAUNA OF TURKEY I. INTRODUCTION AND ACKNOWLEDGMENTS Although large outcrops of Lower Palaeozoic rocks occur in south-eastern Turkey, between the Tigris and Euphrates valleys, relatively little published information is available. The best-known exposures lie along an elongated belt, up to almost 3 km. wide, running east-south-east from a point 2 km. south-east of Derik towards Mardin, about 20 km. north-west of the Syrian frontier (for place names see Text- fig, i). Tolun & Ternek (1952) gave a short d
. Bulletin of the British Museum (Natural History), Geology. 84 ORDOVICIAN TRILOBITE FAUNA OF TURKEY I. INTRODUCTION AND ACKNOWLEDGMENTS Although large outcrops of Lower Palaeozoic rocks occur in south-eastern Turkey, between the Tigris and Euphrates valleys, relatively little published information is available. The best-known exposures lie along an elongated belt, up to almost 3 km. wide, running east-south-east from a point 2 km. south-east of Derik towards Mardin, about 20 km. north-west of the Syrian frontier (for place names see Text- fig, i). Tolun & Ternek (1952) gave a short description and small-scale maps of the Cambrian outcrops near Derik, and the highest part of the Cambrian succession as shown by them is known now to be Ordovician in age. Later Tolun (1960 : 236) noted the occurrence of Silurian rocks (sensu lato including Ordovician) in south- eastern Turkey and mentioned a succession of 900 m. of marly and sandy beds with brachiopods, graptolites and trilobites underlying Cretaceous limestones at Bedinan. He remarked also on the similarity of the Bedinan Ordovician rocks to others found in bore-holes in northern Syria. The most important work dealing with this region is that of Kellogg (i960) who mapped a large area west of Mardin and gave detailed sections through all the stratigraphical subdivisions present, including the Cambrian and Ordovician rocks. He gave no comprehensive faunal lists but described the Bedinan Formation as containing, especially, " Cryptolithus " and " Sowerbyella- like brachiopods ", which were held to indicate a Middle Ordovician age. Unfor- tunately Kellogg's report remains unpublished, but reference will be made to his work from time to time in this paper. A chart of the rock succession in south- eastern Turkey, from Pre-Cambrian to Quaternary, was compiled by Gemot Schmidt. Fig. 1. Sketch-map of south-eastern Turkey showing location of place-names mentioned in Please note that these ima
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