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数学
DISCOVERY OF GONDWANA FACIES FOSSIL PLANTS OF CALLOVIAN STAGE IN TINGRI, XIZANG
<正> Formed in the Middle Jurassic Epoch, the coal-bearing strata around Puna village within Pazhag township in Tingri County, Xizang, were named the Puna Formation by LUO Zhong-shu (1980). The coal-bearing strata are marine-continental interactive facies, whose lithologic character is medium-grained sandstone, fine-grained sandstone,
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Chinese Science Bulletin
1989年01期

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