Mafan intrusion, located at the center of Beihuaiyang depression, is a Caledonian intrusion ( 40 Ar/ 39 Ar hornblende age of (462.

The types and characteristics of the sedimentary facies developed in Pukou formation of Upper Cretaceous in Huaiyin sag of Yanfu depression are analyzed.

Accumulation condition and exploration direction of Permo-Carbon-iferous system,Huaiyang Depression;

Beihuaiyang basin and range structural belt is an important part of Dabie orogenic belt.

By means of different subjects and te chniques,the paper makes an overall study on the crustal stability of Beihuaiyang region and its adjace nt areas from the aspects of current t ectonic stress fields,principal fa ult structures,analysis of regional fa ults and neotectonic activity,seis mic activity and numerical modeling,etc.

The timing and tectonic implications for the North Huaiyang synclinoria;

Geochemical characteristics of Yanshanian magmatic rocks in north Huaiyang and their tectonic environment;

This paper briefly introduced the current research situation of stratigraphy,tectonics,magmatic rocks and other geological aspects as well as some major geological issues in the North Huaiyang area.