| Hornelen Basin | |
|---|---|
 Five of the ca. 100 m thick cycles of axial sandstone on Blånibba, the highest point in the Hornelen Basin | |
 Geological map of the Hornelen Basin | |
| Coordinates | 61°45′N 5°27′E / 61.75°N 5.45°E |
| Etymology | Hornelen |
| Region | Vestland |
| Country | Norway |
| Characteristics | |
| On/Offshore | Onshore |
| Area | 1,100 km2 (420 sq mi) |
| Geology | |
| Basin type | Extensional |
| Age | Devonian |
| Faults | Nordfjord-Sogn Detachment |
The Hornelen Basin is a sedimentary basin in Vestland, Norway, containing an estimated 25 km stratigraphic thickness of coarse clastic sedimentary rocks of Devonian age. It forms part of a group of basins of similar age along the west coast of Norway between Sognefjord and Nordfjord, related to movement on the Nordfjord-Sogn Detachment. It formed as a result of extensional tectonics as part of the post-orogenic collapse of crust that was thickened during the Caledonian Orogeny towards the end of the Silurian period. It is named for the mountain Hornelen on the northern margin of the basin.