Tidally influenced deltaic sequences from the Kap Stewart Formation (Rhaetic-Liassic ), Scoresby Land, East Greenland

Sediments from the Kap Stewart Formation in Scoresby Land are described and interpreted as tidally in­fluenced detaic deposits. Two major types of sequences can by destinguished: (A) horizontally laminated black mudstone followed by flaser or lenticularly bedded sandy mudstone and erosively overlain by cross- bedded channel sandstone. (B) horizontally laminated black mudstone overlain by wave-ripple bedded, horizontally laminated or structureless sandstone. It is suggested that sequence A was deposited during infilling of an interdistributary bay. The mud and fine sand at the base of the sequence resulted from over­bank floods; the channel sands formed when distributary channels extended into the bay under tidal influ­ence. Sequence B is interpreted as a bay mouth sequence; laterally redistributed sand was deposited at the seaward end of open bays by wave-action. Palaeocurrent data suggest a southerly palaeoslope and an E-W trending coastline in Scoresby Land during deposition of the Kap Stewart Formation.