
Pe 
Å‘ 
* 
~~” ee 

1891.] Formations in the East-Indian Archipelago. 959 
THE PERMIAN, TRIASSIC, AND JURASSIC FORMA- 
TIONS IN THE EAST-INDIAN ARCHIPELAGO 
(TIMOR AND ROTTI).' 
BY AUGUST ROTHPLETZ. 
S eke years ago my friend Wichmann, professor in the Uni- 
versity of Utrecht, in Holland, sent me a rich collection of 
Mesozoic and Paleozoic fossils, which he had made during his 
geological exploration of the Dutch colonies in India, in 1888-'89. 
All these fossils came from the west side of the island of Timor 
and the little neighbor island of Rotti. 
Timor is a locality well known for Carboniferous fossils, which 
were described in 1865 by Professor Beyrich, in Berlin. He 
knew then eighty species from a little river._near Kupang, and 
from another place one Ammonite, which he considered as a rep- 
resentative of the Mesozoic fauna. But Professor Wichmann 
found nearly the same Ammonites in the Paleozoic strata of that 
little river near Kupang. Therefore we must regard all these 
Ammonites as of Paleozoic age. 
Though Triassic strata are not yet known at Timor, they have 
been found on Rotti by Wichmann, with the shells of European 
species of Monotis and Halobia; and in the mud of a volcano 
have been included, together with some Paleozoic fossils, like 
those of Timor, a few truly Jurassic remains,—also in part o 
European character. From the Paleozoic strata I know at pre- 
sent forty-three species, of which twenty-five are not yet known 
from any other country. The other eighteen only give us the 
opportunity to make out the exact age of these deposits. I shall 
mention them especially : 
Six species are spread out over many parts of the earth and 
during many epochs of the Carboniferous and Permian periods: 
Spirigera royssi, Spirifer lineatus, Spiriferina cristata, Productus 
semireticulatus, Fenestella virgosa, and perhaps Amplexus corallot- 
des. Three species are found in the Upper Carboniferous and Per- 
1 Read before the American Geological Society, August 24th, 1891. 
