CONFORMABLE LATE JURASSIC (OXFORDIAN) TO EARLY CRETACEOUS STRATA, NORTHERN BOWSER BASIN, BRITISH-COLUMBIA - A SEDIMENTOLOGICAL AND PALEONTOLOGICAL MODEL

The upper Jackson unit in the northern Bowser Basin includes marine strata of Late Jurassic (middle Oxfordian to Tithonian) age on the basis of the presence of Vaugonia doroschini (Eichwald), Buchia concentrica (Sowerby), Buchia mosquensis (Von Buch), Buchia piochii (Gabb), and Buchia fischeriana (d'Orbigny). Herzogina Chavan and plant macrofossils in the overlying Currier Formation indicate an Early Cretaceous age. A model of continuous sedimentation from the Jurassic to Early Cretaceous time is proposed, with a progression from marine conditions of the Jackson unit to marginal marine conditions, with lower delta plant deposition in the Currier Formation, to nonmarine fluvial conditions, with upper delta plain deposition in the McEvoy Formation. This stratigraphic sequence culminated in alluvial deposits of the Devils Claw Formation. -from Authors