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Unconfined, sand-rich, basin-floor submarine fan deposits have been identified in the Upper Kaza Group of the Windermere Supergroup and are well exposed at the Castle Creek locality, British Columbia, Canada (1). Regional time slices through the Upper Kaza Group are interpreted to indicate a distal-basin-floor setting for the Castle Creek study area. Correlative strata, becoming more proximal to the continental slope over approximately 300 km (186 mi) in a southeast direction occur at Lake Louise, Alberta (1).

The distribution of facies (Figures 3, 4) has led to a threefold subdivision of the ~600-m (~1968-ft)-thick section which displays an upward decrease in the percentage of sandstones from 67.1% to 60.2% to 58.5%, respectively. This overall decrease in sandstone upwards is associated with a general thinning- and fining-upward trend at the scale of the outcrop. The vertical pattern is interpreted to reflect a change from an axial zone of sandstone deposition to an off-axis area with less sandstone and more mudstone or alternatively, an overall backstepping of the basin-floor-fan system.

The lower Upper Kaza is characterized by amalgamated medium- to coarse-grained sandstone turbidites with scoured contacts. Lateral changes in sandstone to mudstone and character of outcrop gamma-ray profiles are interpreted as a change from a channelized lobe-interior to lobe-margin (lobe-fringe to interlobe). The presence of significant bypass facies (mudstone breccias and medium-scale cross-stratified sandstone) and scour surfaces differentiate the middle Upper Kaza from the lower Upper Kaza and mark a change to sediment bypass and scouring

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