postkinematic layer . Strata interval overlying the synkinematic layer and recording sedimentation after salt flow or any other deformation has ceased. Basal postkinematic strata can onlap or truncate an underlying, uneven, deformed surface but show no thickness changes ascribed to local deformation (Jackson and Talbot, 1991).
impsonite (imp'-son-ite). A dull black, nearly infusible asphaltic pyrobitumen, with a hackly fracture and high fixed-carbon content. It closely resembles albertite, but is almost insoluble in turpentine; it is derived from the metamorphism of petroleum.