The macrocephalitinae and associated bathonian and early callovian (jurassic) ammonoidea of the sula island and new Guinea / Макроцефалитины и связанные с ними аммоноидеи бата и раннего келловея (юры) острова Сула и Новой Гвинеи

The East Indies have long been renowned as a source of profuse and beautifully preserved Middle Jurassic ammonites. The fossil localities are widely scattered. from the Sula Islands in the west to New Guinea in the east and Timor-Roti in the south . Their faunas have been extensively described. and the older accounts were critically reviewed by ARKEL(L1 956). By far the most important collection came from two principal areas: the island of Taliabu in the Sula Islands of the northern Moluccas in Indonesia. described by BOEHM(1 912) and KRUIZING(1A9 26). and various localities around Geelvink Bay in north-western Irian Jaya. in the western part of the island of New Guinea. described by BOEHM(1 913) and VISSER& HERME(S19 62) . To these was added in more recent times a third collection from the western Central Ranges of Irian Jaya. described by WESTERMAN&N GET^ (1970) . All came from concretions weathered out of barely exposed soft black shales, found loose in stream-beds, so that of primary stratigraphic information there was none. Attempts to reconstruct the geological succession had thus to rely mainly on correlations with standard successions by means of those forms also known from elsewhere, or the circumstantial evidence of broad fauna1 associations at those localities at which there were reasons to believe that mixing might not have been serious. As a significant proportion of the faunas consisted however of forms that were new, there remained, and continue to remain, many uncertainties.<...>