在澳大利亚北卡那封盆地的东南部,上三叠统Brigadier组为三角洲砂泥岩,在西北部则发育纯碳酸盐岩.盆地东南部有明显的河流及碎屑物源供应的证据,靠近物源区为三角洲碎屑岩沉积,远离物源区为生物礁滩沉积及滑塌沉积,总体上具有明显的混积特征.Brigadier组混合沉积形成的主要原因是碎屑物源输入的停止和水动力的减弱,碳酸盐岩沉积在早期河道砂泥岩之上,这属于典型的相混合成因类型.

In Upper Triassic Brigadier Formation, there developed delta sandstone and mudstone in the southeast of Northern Carnarvon Basin, whereas developed carbonate rock in the northwest of the basin. According to some proofs of source input in the southeastern part of the basin, there developed siliciclastic sediments of delta facies near the provenance,and developed reef-shoal sediments and slump sediments away from the provenance. It is suggested that the mixed sedimentation in the Brigadier Formation is a typical facies mixing with carbonate rocks on the early fluvial sandstones,mainly due to the cessation of debris input and the reduction of hydrodynamic forces.