List of Photo galleries
One of the preserved galleries in the former iron-ore mining district of Zdice (35 km SW of Prague) originated between 1950 and 1965. The iron-rich layer, Ordovician (460 million years) in age, was found to be of low thickness and low grade to be economic. The present study of the gallery is focused on presently forming secondary precipitates of iron and calcium compounds. It is likely that some of the precipitates are microbially induced, with a significant involvement of iron bacteria.
In early June, a geological-speleological expedition participated by Michal Filippi returned from China. This joint expedition of the Czech Speleological Society (Z. Motyčka, L. Matuška, R. Šebela), Institute of Geology of the Czech Academy of Sciences (M.F.) and the Institute of Karst Geology of the Chinese Academy of Sciences (Zhang Yuan Hai) examined and evaluated the potential for geological and speleological research in unexplored areas close to Xiaonanhai, Zhenba, and Sanyuan cities in Shaanxi Province, central China.