上部为薄层泥质板岩；中部为泥质板岩与硅质岩；下部为薄层硅质岩与泥质板岩互层；底部为薄层粉砂质泥岩和水云母泥岩。含丰富的笔石化石：Oktavites spiralis，Monoclimacis griestoniensis，Streptograptus crispus，Spirograptus turriculatus，Rastrites linnaei，Monograptus cf. sedgwickii，Petalolithus palmus，Climacograptus sinuatus，C. cf. miserabilis，Parakidograptus sp.，Pseudoclimac...