地层命名（stratigraphic nomenclature）是指赋予一个特定地层单位以专用的地层名称。
一个较新的包含动物遗骸的化石地层是托莫特地层，它以俄罗斯的一个地区命名。
A slightly younger fossil formation containing animal remains is the Tommotian formation, named after a locale in Russia.
承德地区土城子组的沉积地层，主要保存在两个地区，一处为承德向斜，另一处为古北口断层的南部紧邻断层地区，即分别命名的承德盆地和古北口盆地内。
The sedimentation of Tuchengzi Formation was mainly preserved in Chengde syncline and in the south part of Gubeikou fault in Chengde area, namely Chengde basin and Gubeikou basin, respectively.
于是地层单位需要命名。
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