Late Precambrian (Eocambrian) sediments of south Norway, the so-called 'sparagmite sequence', consist of 1500-3000 m of graywackes, shales, arkoses, carbonates, and conglomerates. A system of coarse clastic wedges deposited as fan deltas are found along the margin of the basin, suggesting that sedimentation took place in well-defined grabens as a response to faulting. The Moelv Tillite is developed both as a massive diamictite and as a drop-stone facies in a laminated matrix, indicating local glaciations around the basin. The sparagmite basin is interpreted as a rift valley structure related to the opening of the protoatlantic ocean. The late Precambrian rifting phase was followed by the Lower Cambrian and Middle Cambrian transgression.
Late precambrian sedimentation in the central sparagmite basin of south Norway