Facies and stratigraphical analyses of glacial and interglacial sediments at M organ B luffs, B anks I sland, C anadian A rctic A rchipelago

Stratigraphical exposures of both glacial and non‐glacial sediments at M organ B luffs, a >6‐km long exposure on the east coast of B anks I sland, comprise a discontinuous archive of Quaternary environmental change. A detailed facies analysis of the sediments and a new stratigraphical framework is incompatible with the many climatostratigraphical units proposed previously. Instead, three distinct intervals of sedimentation are recognized. The first records the progradation of a delta, followed by fluvial aggradation of a braided river valley perhaps ∼1 Ma. The second documents glacigenic sedimentation, including fluctuations of a tidewater glacier margin, in a marine basin more than 0.78 Ma. The third records till deposition by the NW L aurentide I ce S heet during the L ate W isconsinan, followed by the progradation of a deglacial, ice‐contact delta into an ice‐dammed lake ∼12.8 cal. ka BP . The revised stratigraphical framework adds important new terrestrial observations to a sparse and fragmentary data set of Quaternary environmental change in the C anadian A rctic. This study challenges former references and correlations to the previously proposed climatostratigraphical framework and nomenclature.