A set of turbiditebearing sedimentary rocks widely seen between Yakou and Baxiandun，Qingdao，was recently restudied. The rocks are marine clastic and dolomitic formation and have various original depositional structures well preserved. The turbidite is similar to that of the Upper Ordovician in the Yangtze Plate. Naming it as Baxiandun Formation is recommended by the authors. The turbidites contained many pebbles of granitoid，amphibolite，and felsic rocks，indicative of the provenance during the deposition time and providing hints to the tectonic reconstruction of continental margin of the Yangtze Plate in the late Ordovician. In geochemistry，these rocks are greywacke and shale，which reflect the turbidite nature from another aspect. Weak negative Ce/Ce* anomaly indicate the marine origin，as well as terrigenous contribution. In addition，the turbidite formation shows a combined nature of active continental margin and island arc in tectonic setting，as shown by diagrams of(Fe2O3+MgO)-TiO2，LaThSc，and ThScZr/10，and should be formed more closely to an active continental margin indicated by higher La，Ce，and REE abundance. The rocks were probably situated in the followup obduction of split upper crust cover of the Yangtze Plate onto the North China Plate in or after the subduction of the Yangtze Plates continental materials towards the North China Plate，or were placed by southward thrusting when ultrahighpressure metamorphic rocks underpinned. The research result of the clastic rocks imply possible existence of corresponding Ordovician beds with potential oilgas reservoir and capping beneath the South Yellow Sea.