412 Von Richthofen—Geological Explorations in China. 
On the frontier of Corea, this oolitic limestone abounds in the 
remains of Trilobites and small brachiopods, chiefly of the Orthis 
and Lingula families. e sediments were there deposited in in- 
lets of the ancient sea between ridges consisting chiefly of gneiss, 
granite and quartzite. The accumulation of the shells of trilo- 
: : cs : 
eames s, in bul r all other eae formations of 
io-tung and ‘extends peed into Cor In Liao-tsi, it appears 
porphyries. gain it takes a dominent part in the structure 
of the country in the province of Chili, ia between Yung- 
stones (that is, its upper portion) form the narrows which lead to 
the Nankan pass. ‘They are intensely altered, and traversed by 
innumerable dykes of intrusive roc What ‘Pumpelly reer a8 
as the Hwaingan beds, are probably the lower strata of this s 
great a 
and Orth e 
mediately below the coal-bearin — the conformable superpo- 
sition of which on the att i 
ae ures. ne pe len wes we to be conformable to that 
re are, however, more numerous instances where the outbreaks 
of granitic and then of porphyric rocks, which extended 
ruptive action. Coal-meas 
formable to the underl as all instances which came 
under my observation. “ithe ment : 
