(1) This indicates that there existed a short period of radiolarian development before the great extinction at the Permian-Triassic transition.(2) Twenty-two samples for radiolarian research were collected from the grayish black, thin-bedded limestone and siliceous limestone of the Baoqing Member and the Mcishan Member.(3) Calcareous oozes are common in the low and mid-latitudes while in other places, particularly the high latitudes, radiolarian oozes tend to dominate.(4) This contradiction cannot be resolved at present due to a lack of Cambrian radiolarian studies, which are needed to provide chronostratigraphic corroboration.(5) Well-preserved Late Cambrian radiolarian faunas were recovered from carbonate rocks of the Cow Head Group of the Great Northern Peninsula of the island of Newfoundland, Canada.(6) Like other radiolarians , Acantharea have an elaborate mineralized skeleton.(7) Won regarded the hollow canal structure as one of the indicators of the close relationship of radiolarians and the Porifera.(8) However, because of the morphological differences between modern radiolarians and ancient ones, it is difficult to reconstruct precisely the ecology of ancient radiolarians .(9) It is also noteworthy that these radiolarians generally have quite fine frameworks and thin shell walls, resulting in semitransparent specimens.(10) Therefore, in terms of geological age determined by radiolarians and the ammonoid, this brachiopod fauna should be assigned to the latest Changhsingian.