Geology. — “Quaternary and Tertiary Limestones of North-New 
Guinea between the Tami-, and the Biri-river basins’. By 
Dr. L. Rurren. (Correspondent of the Academy). 
(Communicated at the meeting of February 26, 1921). 
In arranging the rocks, collected by the New Guinea-Expedition 
of 1903, it appeared that in the coastal region of North-New Guinea 
between the Tami-river and Walckenaers-bay, folded deposits of 
tertiary age and limestones, belonging to a quaternary transgression, 
are widely spread along with old basic eruptive rocks and scarce 
mesozoic sediments *). 
The tertiary deposits have afterwards been found in the region 
of the 141% meridian comparatively far into the interior: limestones 
with Lepidocyeclina were met with in the Upper course of the 
Bewani-river (Basin of the Tami) and of the Keerom-river, about 
66 km. from the coast’). It seems that tertiary deposits play an 
important part in this zone, which lies between the coast and the 
large central plain, through which the affluents of the Idenburg-river 
are flowing. 
As known, the Mamberamoriver equally breaks — about 300 km. 
to the West — through a young folded mountainrange, called the Van 
Rees-mountains, which are built up chiefly of young tertiary sand- 
stones, shales and limestones with dykes of eruptive rocks. 
Likewise it is known that older, basic eruptiva and  mesozoic 
sediments are of rare occurrence here’). The strike in the Van 
Rees-mountains is S. 65° to 5.E., so it might be expected that the 
tertiary folded mountains could also be found in the region between 
the Van Rees-mountains and the Tami-river, while the a priori 
conclusion might be made that here indications were tu be found 
of the occurrence of older basic eruptiva. 
For the “Bataafsche Petroleum-Maatschappij” I recently examined 
a collection of limestones and marls, collected by Dr. W. van Horsr 
1) A. WicHMANN. Nova Guinea. IV, 1917. 
L. Rurren. Nova Guinea. VI. 1914. 
2) L. ScHuLtTzg. Mitteilungen aus den Deutschen Schutzgebieten. Ergänz. Heft 
11. Berlijn 1914. 
8) J. van GexpeEr. Jaarb. Mijnw. Nederl. Indië. 1910. Wetensch. Gedeelte. 
p. 87 —112. 
