黔北桐梓红花园地区的五峰组是华南地区奥陶系的重要剖面之一,在其以泥质灰岩为特征的五峰组观音桥段下部黑色含炭质钙质页岩和褐色粉砂岩中分别产有较为丰富的双壳类Modiolopsis和腹足类Holopea。产双壳和腹足类的地层中岩性和生物具有差异性,表明观音桥段沉积早期的沉积环境具有多变的特征。横长卵形、较膨凸的Modiolopsis和其两瓣壳相连保存的标本表明为近原地埋藏,为弱水动力、有氧的、较浅水环境的软质基底。丰度较大的低圆锥形Holopea的不规则的壳顶指向指示了具一定水动力的、沙性基底的浅水环境。 The Wufeng Formation in the Tongzihong Garden of Guizhou Province is one of the important sections of the Ordovician in southern China. In its calcareous shale and brown siltstone in the lower part of the Wufugou-Guanyinqiao section characterized by mudstone limestone Respectively produce a more abundant bivalves Modiolopsis and Gastropoda Holopea. There are differences between lithology and biology in the strata producing bivalves and gastropods, indicating that the sedimentary environment in the early stage of the Guanyinqiao section has varied features. Species that are long-ovate, conserved in association with the bulged Modiolopsis and its two clavicles indicate soft substrates buried in near-in-place, weakly hydrodynamic, aerobic, and shallow water environments. The irregularly defined top of the shallow, conically-shaped Holopea indicates the shallow-water environment of a hydrodynamically sandy substrate.