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One of us (H. S.) collected fossil cephalopods from a locality 3 km NWW of Muktinath (Figs.1,2). They were in pyrite-bearing siliceous nodules derived from the black shale, a part of the Spiti Shales.... Some of them were brought to the other of us (T. M.) for identification and the following six ammonites, which have been donated to Kyushu University, are described in this paper with illustrations (pls.7-10): (1) Aspidoceras andinum STEUER, (2) Corongoceras lotenoense SPATH, (3) Virgatosphinctes aberrans sp. nov. (holotype), (4) Grayiceras blanfordi SPATH, (5) Paraboliceras fascicostatum (UHLIG) and (6) Paraboliceras tibeticum (UHLIG). In addition to them, the specimens which were identified preliminarily to the following species were donated to Tribhuvan University: (7) Uhlgites cf. kraffti (UHLIG), (8) Kossmatia cf. desmidoptycha (UHLIG), (9) Kossmatia sp. aff. K. desmidoptycha (UHLIG) (microconch with lappets), (10) Virgatosphinctes sp. aff. V. broilii (UHLIG), (3’) V. aberrans (paratype) and a number of belemnites. The faunule as a whole is of Tithonian age and most probably represents the Middle Tithonian, although a few species may suggest the upper Lower Tithonian or the lower Upper Tithonian. Finally palaeogeographic implications of the Spiti Shales and the faunas are discussed in the light of modern earth-sciences.続きを見る
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Mendeley出力
25_01_p075