A new type of basalt has been discovered in Bahngshan of Jiangling and Jishansi of Jingmen， Hubei．According to its geochemical features，this type of basalt has been named plastically deformed cryptoflow basalt． The rock iS formed under hidden conditions and has a particular mode of occurrence，contactrelationship，and petrological and geochemical features．The authors hold that this type of basaltresults from modification of effusive-—facies basalt by volalile?-rich acid magma through cryptovol-canic eruption at very shallow depths