Devonian-Carboniferous extension and Eurekan inversion along an inherited WNW-ESE-striking fault system in Billefjorden, Svalbard.

The Billefjorden area in central Spitsbergen hosts thick Lower-lowermost Upper Devonian, late-post-Caledonian collapse deposits presumably deformed during the Late Devonian Svalbardian Orogeny. These rocks are juxtaposed against Proterozoic basement rocks along the Billefjorden Fault Zone and are overlain by uppermost Devonian-early Permian deposits of the Billefjorden Trough, a N-S-trending Carboniferous rift basin bounded by the Billefjorden Fault Zone. We interpreted seismic reflection (also depth-converted), bathymetric, and exploration well data.