286 General Notes. 
extending over the whole of the peninsula that terminates at Pi 
Camao. The interior of this peninsula, and large areas in the 
Me-kong, are completely marshy. Further north, on the Gulfof 
Siam, is a sandy tract traversed by granitoid mountains, and with 
a mass of sandstone in the center. In the north of the regions 
a porphyritic mass and one of sandstone, The chief mountain 
mass is to the west, in Baria and Bienhoa, and consists of four 
separate chains of granitoid rocks. A great part of Bienho, 
Longh-Thanh and Baria is covered with an extensive deposit 
ferruginous clay, often containing so much iron as to becomes 
veritable iron ore. This is often used as a building stone, ani 
even at Saigon for macadam, a use for which its friable natur 
unfits it. M. Petiton states that in Cambodia, in many mountaits i 
to the north of Udong and to the west of the River Toule Sap, he 3 
has found microgranulite, granulite, porphyry and petrosiliceot 
porphyry. To tke east of the river lies the mountain Pnom Neang 
Canh Rey, composed of the last named mineral, and iron ma | 
and lime quarries also exist in the region. To the south-west? 
Pursat commences the enormous formation of more or less po" 
phyritic sandstone, which extends thence westward into rer 
ese province of Battambang. Very little stratification ey pan 
yet met with in Lower Cochin China, and the only foss! 
was an encrinite in the limestone of Hatien. 
Siluri Axel Tullb tributes to the Zeitschrift & 
vian.—Axe] Tullberg contribu : f the Sinit 
rographically very different from those of Northern 
Silurian of the islands Oeland and Gothland, East hs 
sed of li 
upper stage of the Upper Silurian is in parts repr ‘the L H 
about 1000 meters of Cardiola shales, the equivalent o oal 
meters, while the Cambrian or “primordia! 7 e Geol Ge 
some 120 meters thick._—F. Neetling (Zeit. ee zens P, i 
1883) has a note upon the systematic position “qrii and P. ee 
ambonites, and describes two new forms, P. schm n of th , 
‘Both occasionally occur in boulders. Comparis© 
