Sub-Mesozoic hilly peneplains

The landscape formed in the Mesozoic Era and was eventually drowned by the sea during the Campanian transgression and covered by a thick blanket of Cretaceous sedimentary rocks.

[1] During the Quaternary epoch the re-exposed Mesozoic hilly relief escaped major glacier erosion being only surficially scoured in parts.

This would indicated that Paleozoic strata that covered much of Fennoscandia elsewhere had been locally uplifted and eroded prior to the formation of the Sub-Mesozoic hilly relief.

[4] In parts this surface and unconformity makes up an undulating hilly relief, while in other locations like Blekinge and northern Halland it is a joint valley landscape.

[5] In Bohuslän the Mesozoic weathering associated with hilly relief is likely also responsible for creating the numerous small rock basins carved into Bohus granite that characterize the coast.