(Table T1) Geochemical composition of flintstones obtained from Helgoland, No...
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The results of investigations carried out between 1975 and 1978 are summarized. Based on observed echinoid association the flintstones were assigned to the Upper Middle...
本文总结了1975年至1978年间开展的调查研究结果。基于观测到的海胆类（echinoid）化石组合，该燧石地层被划归至中上部……
