An anomalous domain of complex structure occurs in the eastern Skeena Fold Belt at Mosque Mountain, at the northwestern end of a regional belt of Cretaceous Sustut group exposure. Folds and contractional faults with northwest- and northeast- to east-trends, that are,parallel and at a high angle to the regional structural,trend respectively, deform Jurassic Hazelton and Bowser Lake groups and unconformably overlying Sustut Group strata :In this area. Anomalous structural trends at Mosque Mountain appear to reflect a history of superposed deformation. The older deformation occurred prior to and during deposition of the Middle Albian or younger basal Sustut Group; It caused the formation of a northwest-trending :"basement," uplift of Hazelton and Bowser rocks whose abrupt northwest termination directly underlies the Mosque Mountain area.. The main post late Campanian to early Maastrichtian contractional deformation formed northwest- and northeast- to east-trending structures in the Mosque Mountain area. Structural geometries and cross-cutting relationships suggest these nearly orthogonal contractional structures formed alternately. These relationships are most reasonably attributed to deformation on alternately active detachments or (blind) thrusts. Northwest-trending structures conform to regional strain patterns. Northeast- to east-trending structures were most likely caused by detachment deflection at the transverse, north end of the "basement" uplift; by movement up an oblique ramp formed by the geometric inversion of the north end of the "basement" uplift along a blind thrust, and/or reactivation of the north margin of the "basement" uplift. Geometric inversion of the early formed "basement" uplift on a footwall flat probably produced the south-facing monocline that localized the northwestern limit of preserved Sustut strata to the Mosque Mountain area. Late dextral oblique-slip and extensional faults cross-cut Skeena Fold Belt structures and indicate that transtensional deformation, common in the Central Interior of British Columbia, extended northward into the Mosque Mountain area.