...; particularly the impacts of past glaciations on the sedimentary and structural architecture of the deposits left behind following deglaciation. The range of depositional environments and distribution of deposits including diamictons, organic soils, rhythmically laminated soils, sands and gravels, result...

.... These filter- feeding polychaete worms construct hard tubes from sand grains found on a seabed, typically comprising sandy gravels with shells and boulders, in areas of high tidal flow. They can occur as small colonies and thin mats, which can be the pre- cursor to the final but most important type of colony...