Upper Middle & Upper Devonian

Lower Middle Devonian

Lower Devonian

Basement geology


The original division of the Orkney Sedimentary sequence by the Geological Survey (Wilson et al, 1947)

Hoy sands are now considered facies variant equivalent in age to the Eday Group - Givetian to Frasnian

    800m     Hoy Sandstones   U Devonian

U Devonian

M Devonian











L Devonian?

                      BASEMENT COMPLEX