The occurrence of a series of thin but persistent early Cambrian (Cambrian Age 4) brachiopod shell concentrations extending along a transect of some 150 km in NE Greenland, indicates the ability of the group to form widespread, skeletal pavements very early in the history of the phylum, its gregarious behaviour and ability to harness available nutrients. These extensive shell pavements within the Bastion Formation mark biological events within the basin, the abundance of shells perhaps associated with oscillating redox conditions prompting the dissolution of phosphate and its spread across the shelf. The shells were subsequently reworked and deposited by episodic distal storm surges with some winnowing.

在格陵兰东北部约 150 公里的横断面上出现了一系列薄而持久的早期寒武纪（寒武纪第 4 期）腕足动物壳浓度，表明该群体能够在很早的历史中形成广泛的骨骼路面门，它的群居行为和利用可用营养的能力。Bastion Formation 内的这些广泛的贝壳路面标志着盆地内的生物事件，贝壳的丰富可能与振荡的氧化还原条件有关，促使磷酸盐溶解及其在陆架上的扩散。炮弹随后被重新加工和沉积，并通过一些风选的偶发性远端风暴潮沉积。