概要的总结了东北区中生代地层中古生物群，以及它们在岩石地层单位中的分布，借以说明岩石地层的时代，为地层多重划分对比提供了依据。
The Mesozoic biota and their distribution in lithostratigraphic units in northeastern China are summed up to suggest the age of the units and to be the basin for multiple classification of strata.
罗圈组为一穿时地层单位，时代为震旦纪—早寒武世。
Luoquan Formation is a diachronous unit from Sinian to Lower Cambrian.
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