Assemblage is underlain by the regionally extensive Luning thrust and lies structurally below the Pamlico-Lodi assemblage (WPL) (Oldow, 1984a). The Upper Triassic continental shelf sequence part of WLB consists of platform carbonate rocks and shallow-marine to deltaic-clastic rocks. Minor amounts of volcanogenic rocks are interbedded with terrigenous clastic rocks near the western margin of the assemblage (Oldow, 1984a). These are conformably overlain by Lower (Pliensbachian) to Middle Jurassic quartz arenite and coarse clastic rocks which grade upward into volcanogenic rocks (Oldow, 1984a; Oldow and Bartel, 1987). Rocks of the Luning-Berlin assemblage are involved in a complex deformational history involving first northwest-southeast thrusting, followed by second folds with north-northwest to west-northwest axial planes (Oldow, 1984a). The folding is constrained between Middle Jurassic and Late Cretaceous (90 Ma) (Oldow, 1984a). Rocks that have been assigned to the Dunlap, Gabbs, Sunrise, Luning, and Grantsville Formations are included in this assemblage (Silberling, 1984; Whitebread and John, 1992).