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than Aiidai, while they can be recognized in a zone running all 

 along the nortli coast of "the Bird's head" as far as the island of 

 Batanta. II will be seen at a glance that we have to do here 

 with a cotnparativily narrow zone of oldei'-neogene, which follows 

 the east, coast and ihe north coast of the "Bird's head". It may be 

 that older-neogerie still occnrs also in the more western and southern 

 region of "Bird's head", but it is remarkable that among the numerous 

 rocks from those regions that were examined by me, there was not 

 a single one that could positively be referred to the older neogene. 

 We shall see lower down that this is partly due to the facies of 

 the discovered rocks being indifferent, to oiii' having to do either 

 with non-fossiliferous rocks or with rocks that have been deposited 

 in a deeper sea, in which the fossils, so characteristic of the littoral 

 older neogene, cannot be expected to occur. But beyond these also 

 rocks occur repeatedly in the southern part of the "Bird's head", (hat 

 are of littoral facies, in which e.g. Lithothamnium, Operculina and 

 Amphistegina, the companions of Lepidocyclina in the older neogene 

 etc., occiii', but in which the Foraminifera, which are characteristic 

 of the older neogene, are lacking. In such cases we no doubt have 

 to do with younger neogene lohich indeed is often borne out by the 

 habitus of the roch. As an instance we point to the basin of the 

 Aer Beraur and of the Aer Klasaman, in which a series of rocks 

 occur that are referable to the younger neogene. Another region of 

 probably young-neogene rocks, partly with true littoral habitus, is 

 situated North of lake Amaru. Between lake Amaru and the Aer 

 Beraur a number of rocks have been found: globigerina marls, fine 

 grained lime sandstones and the like, which are completely indif- 

 ferent, so that nothing can be said about their age. The same 

 applies to some rocks from the region soutii of lake Amaru. A long 

 list of rock samples, collected in a west-east zone far north of lake 

 Amaru, are undoubtedly referable to the neogene, but their fossils 

 and their facies are not typical enough to say whether they belong 

 to the older or to the younger neogene. In some rocks, however, 

 doubtful Lepidocyclina were recognized; Ihe others have been 

 classed under the "indifferent rocks". Lastly among the rocks from 

 the basin of the Aer Sebjar there are some littoral limestones, in 

 which no "older" forms are to be found, so that here also we have 

 probably to do with younger neogene. On the other hand, a number 

 of very fine grained lime sandstones and globigerina limes, collected 

 east of Mnturi-river have to be classed under the "indifferent rocks". 

 They may be of older-neogene age, because in the adjacent region 

 towards the east (west of Rnmberpon) a few transition rocks were 



