EGOMJamesLime

East Newfoundland Offshore

Flemish Cap Offshore

On this tentative geological interpretation of a Canvas autotrace of a composite seismic line crossing the south fracture zone (?) of Flemisch Cap offshore, the Mohorovicic or Moho discontinuity, i.e., the boundary between mantle and the Earth's crust, at which the seismic waves accelerate, is guessed. Similarly, a limit between the lengthened and thinning Pangea continental crust, in which rift-type basins were developed, and the newly oceanic crust is proposed. Near the breakup zone, such limit is fossilized by the deposition of lava-flows effused from the initial aerial expansion centers (emerging sheeted dykes). Since the expansion centers become immersed by the marine ingression induced by the combined action of the subsidence (weight of the superposed lava-flows) and absolute sea level rise (volume reduction of the oceanic basis), there are formation of oceanic crust (pillow lava) for the reason that lava cannot flow under water. Landward of the breakup zone, the onlapping of the sediments deposited in association with the continentward encroachment of the marine ingression end by fossilize the totality of the breakup unconformity.