内容简介
Cover photo:
Thousand-lsland Lake and Chun'an County town,backed by Ordovician and Silurian Mountains.
Bask photos（from left to right):
1.Huangnitang GSSP section in the Changshan National Geopark
2.Chencunnong Quarry,Jiangshan
3.Tongjunshan Cliff along the Fenshui River,Tonglu
4.Late Ordovician mudcracks at Zhuzhai,Yushan