200 The Philippine Journal of Science 1922 
In certain localities in Borneo rocks of proved Upper Creta- 
ceous age rest uncomformably upon the older radiolarian beds, 
so it is clear that the upper possible limit, Lower Cretaceous, 
is fixed for these cherts. Hinde ** compares the species of Ra- 
diolaria with radiolarian faunas elsewhere and concludes that 
their age is Jurassic. 
Smith reports the same rocks from the western cordillera of 
Panay and from Bulacan Province, Luzon. At the latter place 
he made slides from material collected by Mr. Frank A. Dalburg 
and recognized the Radiolaria Cenosphaera affinis Hinde and 
Dictyomitra tenuis Hinde. The photomicrographs given in 
Plate 1 illustrate these interesting marine forms. 
Similar forms have been described by Hinde in the appendix 
to Molengraaff’s Explorations in Borneo. 
The stratigraphic evidence of the relative age of these rocks 
in the Philippines is lacking, but the geographic distribution of 
similar rocks in the Moluccas and Borneo indicates that they 
all represent the same period. Unfortunately the Radiolaria 
have a rather great geological range and on this account only a 
tentative assignment to the Jurassic is possible. 
No Cretaceous rocks have been recognized in these Islands, 
although the Cretaceous is well developed in Japan. 
TERTIARY 
The lowest portion of the Tertiary, the Eocene—the dawn 
of modern life—has also not been recognized with certainty in 
the Philippines, although rocks of this age occur in Japan to the 
north and Java to the south. 
The genus Nummulites in many regions is characteristically 
Eocene, but in the East Indies this genus is not so restricted. 
The type locality of Nummulites subniast Douvillé is in limestone 
associated with coal measures of Batan Island. This form, 
according to Douvillé, is equal to Nummulites variolaria Brady 
from Nias Island, which is located near the west coast of Su- 
matra. This species, according to Brady, is associated with 
Nummulina ramondi, Orbitoides papyracea, and Orbitoides dis- 
pansa, in Sumatra. The form identified by Brady as Orbitoides 
papyracea was later shown to be distinct from this species and 
“ Hinde, G. J., Appendix on fossil Radiolaria of Central Borneo in Molen- 
graaff, G. A. F., Geological explorations in Central Borneo. Society for 
the Promotion of the Scientific Exploration of the Dutch Colonies, Leyden 
(1898-94). 
