Evaluation on the geological relic resources of Nangongshan National Geopark in Langao county,Shaanxi

Volcanic rock of Nangongshan National Geopark in Langao county of Shaanxi province formed in the Early Silurian dating back 42 million years ago,is the currently China's most ancient national volcanic geological relics protection zone. volcanic rock peak forest landform and ancient collapsed volcanic landform are the main features. There are four broad classes,six subclasses,and seven classes. Through the investigation on Nangongshan Geopark geological relic resources,we carried out quantitative evaluation and comprehensive value evaluation on Nangongshan geological relic resources by combination of qualitative and quantitative methods. In the park there are 4 kinds of national level geological relics. The ancient volcanic rock forest landform is typical and unique. with unique Silurian volcanic rocks construction in Qinba area,complete process of collapse relics by gravity,ideal research place of regional geological evolution and typical example of rift tectonic activity along the north margin of Southern China plate in late Caledonian.