说明：  在三维环境中建立地层坐标系，地层坐标系和三维中实际坐标系是不符的，本例用vrml语言在此环境中建立正确的地层坐标系
(Establish stratigraphic coordinate system in a three-dimensional environment, the stratigraphic coordinate systems and three-dimensional actual coordinate system is inconsistent, in this case with the correct stratigraphic coordinate system the vrml language in this environment)