Based on the distribution of ammonoid fauna from the Upper Permian Dalong Formation to the base of the Lower Triassic Daye Formation,four ammonoid zones are recognized:(1)Araxoceras-Konglingites-Sanyangites zone,(2)Sinoceltites zone,(3)Pseudotirolites-Rotodiscoceras zone,and(4)Hypophiceras-Ophiceras-Lytophiceras zone.

In the Shangrao and Qianshan area of Jiangxi, ammonite fossils are very abundant in thecoal measure strata of Shangrao Formation which is a contemporaneous heleropic deposit of the Maokou Formation This paper has described in detail a large quantity of ammonites collected from this area and has discussed preliminarily the evolution of some of them.

With the suture line of ammonites as an example, the morphological feature in this paper is quantitatively described in view of fractal geometry.

Ma jiashan , Northwest Chaohu City, Anhui Province, East China, where the Lower Triassic is well developed and composed of the alternations of mudrock and limestone deposited on a deep part of the Lower Yangtze carbonate ramp, containing rich ammonoid fossils.

Restricted sea ammonoid-bearing (siliceous) muddy deposit, IV.

Because of the chaotic stratigraphic division of the Mid-Lower Jurassic dark-colored rock series in the Doima stratigraphic area, southern Qiangtang, the authors measured the Songke′er section in Sêwa during the petroleum geological survey in 2005 and systematically collected abundant ammonoid fossils with chronological significance.

THE DISCOVERY OF Ophiceras IN THE KAYITOU FORMATION IN EASTERN YUNNAN PROVINCE AND ITS SIGNIFICANCE;