The high sedimentation rate recorded in the Tanzania coastal
basin during the Middle Jurassic is contemporaneous with the
onset of rifting between East Africa and the MadagascareIndiaeAntarctica
landmass. Sediment supply during this
period originated from the erosion of the rifting associated uplift.
The fall of the flux from 4.9 103 km3/Myr during Middle Jurassic
(T1) to 1.9 103 km3/Myr during Late Jurassic (T2) probably shows
that the major part of the rifting-associated relief was eroded
during the Middle Jurassic.