The Lower Cretaceous Glauconitic member in the Badger, Little Bow, Retlaw and Turin fields in southern Alberta is interpreted to consist of stacked, partially overlapping, unconformity bounded sequences each of which comprises valley-fill and inter-valley strata. Incised valley-fills are up to 33 m thick and 2.5 km wide. Inter-valley successions occur outside (between) the incised valleys; they lie atop stratigraphically flat-lying portions of sequence boundaries, are up to 7 m thick, can extend more than 8 km laterally away from associated valleys, and commonly overlie paleosols. Sedimentological and ichnological analysis of cores indicates that both valley-fill and inter-valley strata accumulated dominantly in estuarine environments. Each sequence boundary is interpreted to have formed during a fall of relative sea level with valley incision accompanied by soil development on subaerially exposed interfluves. Valley-fill and inter-valley strata of each sequence together represent a transgressive systems tract which was deposited during a rise of relative sea level. Valley-fill deposits accumulated dominantly in inner to middle estaurine environments, whereas inter-valley sediments were deposited in broad outer estaurine embayments. Reservoir sandstone bodies in valley-fill and inter-valley strata have different geometries. Valley-fill sandstones are thick, elongate pods which formed from longitudinal sand bars in tidal bay-head deltas when inner-middle estuarine sedimentation was confined within valleys. Inter-valley sandstones are thin sheets which formed from coalesced sand shoal and tidal channel deposits when outer estaurine embayments spread across interfluvial areas adjacent to the valleys.