A Marine Triassic Fauna from Eastern Persia

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Abstract
I. I ntroduction . Among a large collection of rocks and fossils made by Mr. R. C. Jennings & Mr. K. Washington Gray, Geologists of the Anglo-Persian Oil Company, during exploratory work in Central and Eastern Persia, and sent to me for examination, a rich marine Triassic fauna was found to occur. This is of particular interest, since the existence of fossiliferous rocks of that age in Persia, although actually first discovered in 1912 by General O. von Niedermayer, has been almost entirely unnoticed in literature dealing with the geology of that country. Most writers on palæogeography are agreed in depicting the ancient Mediterranean Sea, or Tethys, as stretching continuously in Triassic times from Europe eastwards to the Himalayas, basing their conclusions on the similarity of the faunas in the two areas; but for a great part of this extent, namely, the district between Asia Minor and Afghanistan, comprising abont 30 degrees o longitude, the actual record has hitherto been blank. This recent discovery of a marine Triassic fauna in Eastern Persia, helps, therefore, to fill an important gap in our knowledge, although much remains to be learnt about the actual succession of the deposits. The district of Naiband and Hauz-i-Khan, from which the collection here described was obtained; lies in lat. 32° 20′ N. and long. 57° 35′ E., near the southern border of the province of Kuhistan, about 150 miles north of Kerman and 330 miles due east of Isfahan, and forms part of a range of high hills running

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