. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 378 BuUctin Museum of Comparative Zoology, Vol. 134, No. 10 LANDA NARMIA ZALUCH NAMMAL CHHIDRU (EAST) KUFRI KATHWAI 25 ~ E is. Vertical scale in feel Figure 5. Diagrammatic reconstruction of facies relationship; of Lower and Middle? Triassic strata in tfie Salt Range and Surghar Range of West Pakistan. ammonoid zones. I have in progress an intensive revision of this fauna. Like the underlying Kathwai Member, the Lower Ceratite hmestone is remarkably uniform throughout the Salt Range and the Trans- Indus Ranges. It is
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 378 BuUctin Museum of Comparative Zoology, Vol. 134, No. 10 LANDA NARMIA ZALUCH NAMMAL CHHIDRU (EAST) KUFRI KATHWAI 25 ~ E is. Vertical scale in feel Figure 5. Diagrammatic reconstruction of facies relationship; of Lower and Middle? Triassic strata in tfie Salt Range and Surghar Range of West Pakistan. ammonoid zones. I have in progress an intensive revision of this fauna. Like the underlying Kathwai Member, the Lower Ceratite hmestone is remarkably uniform throughout the Salt Range and the Trans- Indus Ranges. It is in the remaining strata of the Mitti- wali Member that one finds an interesting diversity in lithofacies. Waagen's sequence of the Ceratite marls, Ceratite sandstone, and the Upper Ceratite limestone is recog- nizable in a general way only in the central region of the Salt Range from Nammal Gorge east to Kufri. \Vest of Nammal Gorge this portion of the xMittiwali Member becomes a fairly homogeneous sequence of shale, silty shale, with some thin sandstone and limestone beds. A diagrammatic inter- pretation of these east-west facies changes is shown on Figure 5. The Ceratite marls are clay shales, green- ish to grav-black in color, with fairly numerous lenticular beds (1 to 6 inches thick) of argillaceous limestone. The Cera- tite marls are very fossiliferous, but the fossils are almost entirely restricted to the thin lenticular limestone beds. The fauna is completely dominated by ammonites with a few nautiloids and pelecypods. The am- monoids are being extensively revised and will not be treated here. The most common nautiloid species is Menuthionoutilus kies- lingcri Collignon; in addition, much less common species include: Gnjpoceras hi- dorsatoides Kummel, Gnjpoceras aemidans Kummel, and Pleiironaufihis kokeni Freeh (Kummel, 1953). Among the pelecvpods, Lukas W'aagen (1900, p. 286) has identified Pcctcn discitcs Schlotheim and Pcctcn cf. (dbertii Goldfuss. Ostracods (I. G. So
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