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The Stubdal Formation's type section in Stuvdal (NM7766) is dominated by sandstones (with intraformational conglomerates), reflecting deposition by braided stream systems prograding over the more fine‑grained deposits of the underlying formation. Palaeocurrent indicators and the petrology of sandstones in both formations suggest drainage systems with sources in the developing Caledonides to the north and northwest of the present Ringerike district (Turner & Whitaker 1976). The maximum preserved thickness of the Stubdal Formation is seen at Stuvdal; when traced southwards the preserved thickness of the formation decreases rapidly because of pre‑Carboniferous tilting and erosion.