Geological researches in China, Mongolia, and Japan, during the years 1862-1865.

78 GEOLOGICAL RESEARCHES IN
Disturbances.
A. Deposition and metamorphism of the older meta- Uplifts apparently of various ages and
morphic strata of China. directions, of which the surface effects
B. Deposition of the metamorpic strata of Mongolia. are mostly obliterated.
C. Deposition of the great Devonian limestone formation.
D. Eruption of the older porphyries of the Sishan,
west of Peking. Sinian revolution forming the N.E. S.W.
E. Deposition of the Chinese Coal measures. system of uplifts.
F. Eruption of the younger porphyries of the Si- Emergence of all China Proper.
shan.
Submergence of Mongolia.
W. Eruption of the trachytic porphyries of Kalgan
and the Gobi Desert.
X. Eruption of the volcanic rocks of S. Mongolia
and the Baikal region.
Y. Deposition of the steppe deposits of the Gobi
Desert.
Commencement of the emergence of the
plateau. Formation of the great dislocation along the southern edge of the
plateau.
Supposed change in the course of the
Hwang Ho, and formation of the chain
of northern lakes.
Z. Deposition of the lake loam of the northern lakes.
Beginning of the delta of the Hwang Ho.
Deepening of the channel of the Hwang
Ho between Shansi and Shensi, and of
the gorge of the Yang Ho, and consequent drainage of the northern lakes.