The stratigraphy of the Dzungarian Basin is summurized as follows:Most of the older rocks are only exposed along the marginal parts or the sur-rounding hills of the basin, while the cenozoic and the mesozoic sediments areextensively developed in its main portion. 1. Paleozoic Rocks, chiefly exposed in the marginal folded zone of the basin:A. Silurian-Devonian formations Mainly of schists, quartzites, phyllites and slates.B. Devonian formations Chiefly of a thick series of volcanic rocks composed green to dark colored basic volcanics, somewhat serpentinized and chloritized. The upper part is of sandstone and conglomeratic intercalations with uppeDevonian fossil remains. C. Carboniferous beds: The Chiherkao-shihtou series. Chiefly of marine tuff, trachytic tuff, sandstoneshale with limestone intercalations and medium acid intrusives and extrusives,thickness about 2,000----4,500 m. In some places these beds are found in uncon-formable relation with the underlying Devonian rocks and the overlying Chichicliaoseries. 2. The Chichichao series. This series may further sub-divided into 4 devisions as: (1) The limestone division, gray limestone, with some sandstone and shale,thickness 300--1,500m. (2) The sandsone and conglomerate division, gray to yellowish green sand-stone and conglomerate intercalations, locally interbedded with some impure lime-stone members. thickness about 1,400 m. (3) The argillaceous bed division, the upper part of gray siliceous shaleinterbedded with sandstone Layers, the middle part of gray shale and thin bedsandstone cr sometimes intercalations, the lower of yellowish green shale inter-bedded with sandstone, occasionally containing some impure limestone and tuffa-ceous shale. Thickness varies from 1,000 to 3,500 m. (4) The sandstone division, gray to yellowish green sandstone interbedded with shale and conglomerate, the lower part containing some impure limestone.Thickness=1,500--2200 m. D. Permian sediments: 1. The Tahaikou Series. It may be described as the lower part of gray shale,conglomeratic sandstone with some dolomitic layers (thickness 2810 m), and theupper part of five sandstone with oil shale intercalations (thickness adout 1290 m). 2. The yaomonshan Series, gray shale and sandstone intercalations with somedolomitic layers. Thickness=810 m. II. Mesozoic Rocks. A. The Triassic Strata: 1 The Tsangfangkou Series, yellowish green to brownish red kaolin bedswith sandstone and conglomerate intercalations. Thickness=1280 m. 2. The Hsiaochienkou Series, gray to yellowish green Kaolin beds and sand-stone inferbedded with conglomerate, containing some lenticular coal seams.Thickness=200--1,500m. B. The Jurassic beds: 1. The Shuangshihlai Series, yellow, gray to green sandstones and Kaolin bedswith some coal seams. Thickness 550--1,800 m. 2. The Pataotung Series, veriegated clay bed and sandstone intercalations withcoal seams in the lower part. Thickness 380--2,450 m. 3. The Wanyaokou series, the lower part being of dark red to green argilla-ceous and arenaceous intercalations, the upper part being of sandstone breccias.Maximum thickness amounts to 1820 m. C. The Cretaceous sediments. The Tukulu Series, of variegated clay beds, fine sandstones and some conglo-meratic lenses. Thickness=620--1,330 m. III. the Cenozoic Mantle. A. The Tertiary sediments. The malce series. 1. section of the northern Dzungarian: (1) The Hungleishan division, chiefly of sandstone and conglomerate=70 m. (2) The Wulungkuho Series, sandstone and clay bed intercalations withconglomerate at the base. Thickness=550 m. Section of the southern Dzungarian (1) The red bed phase brownish red clay and sandstone with basal conglo-merate. Thickness=1290 m. (2) Lower green beds, green sandstone and clay beds with conglomeraticlenses, Thickness=800 m. 2. The Changchi Series. Section of the northern Dzungarian: (1) Son Son chien divrsion. grayish black, grayish green to brownish red claybeds and sandstone with conglomerate lenses and basal conglomerate. Thihckness=90 m. (2) Bluish brown sediments, clay, sandstone with conglomeratic lensesThickness=60 m. Section of southern Dzungarian: (1) Brown sediments, fine sandstone, conglomerate and clay bed. Thickness=612 m. (2) Upper green beds, sandstone and conglomerate intercalations with claylenses. Thickness=880 m. (3) Bluish brown sediments, brownish green coglomerate with sandstone andred clay bed as intercalations. Thickness=350--1,500 m. (4) Conglomerates, chiefly conglomerates with some sandstone. B. The Quaternary Alluvium, chiefly loam, gravels etc. The Dzungarian Basin may be regarded as a nucleus inbetween the geosyn-clines of the Tienshan and the Altai, probably having such insipient formationsince the pre-Cambrian.