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辽西建昌盆地西缘出露的“义县组”，包括底部沉积层和上部火山岩及其沉积夹层，顶底齐全。本文仅涉及底部沉积层，将其从“义县组”中分出来，新建魏家岭组，归属晚侏罗世。该组总厚度为 1 078.97 m，动、植物化石丰富。
The “Yixian Formation” exposed on the western margin of the Jianchang Basin in western Liaoning Province consists of the bottom sedimentary layer and the upper volcanic rock and its sedimentary interlayer with a complete top and bottom. This article deals only with the bottom sedimentary layer and separates it from the “Yixian Formation”. The Weijialing Formation was newly established and belongs to the Late Jurassic. The total thickness of the group is 1 078.97 m, with abundant animal and plant fossils.