In September, 2011, guided by Prof. Su Dechen who is the author of the last paper of this issue, the editor-in-chief of our journal, Prof. Feng Zengzhao observed the outcrop of soft-sediment deformation structures of the Mesoproterozoic Wumishan Formation, Yongding River Valley, Beijing. The soft sediment deformation structures were formed by palaeoearthquake. A spot reviewing for Prof. Su Dechen's manuscript was thus finished during the observation. The specialist of seismites, Prof. Qiao Xiufu, the associate editor-in-chief, Dr. Zheng Xiujuan, editor Dr. Li Xinpo, and others also joined the outcrop observation. Through detailed observation, Prof. Feng Zengzhao proposed his revision comments on the determination of some rock names and gave excellent evaluation to Prof. Su Dechen's manuscript.

The followings are the photographs of this observation. 
 
The scholar putting his hand on the rock is Feng engzhao, and the one next to his left hand is Su Dechen.
(Photographed by Zheng Xiujuan) 

The front row are repectively Zheng Xiujuan, Feng Zengzao and Qiao Xiufu(from left to right).
(Photographed by Su Dechen) 

Feng Zengzhao discussed with Qiao Xiufu.
(Photographed by Su Dechen) 

From left fo right respectively are Su Dechen, Wang Zhengyang, He Bizhu, Guo Xianpu, Qiao Xiufu, Feng Zengzhao, Ji Youliang, Zheng Xiujuan, Yu Enxiao, Qin Gang.
(Photographed by Zhou Yong)