Open AccessTidally influenced deltaic sequences from the Kap Stewart Formation (Rhaetic-Liassic ), Scoresby Land, East Greenland
Author(s) -
Lars B. Clemmensen
Publication year - 1976
Publication title -
bulletin of the geological society of denmark
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.674
H-Index - 28
eISSN - 2245-7070
pISSN - 0011-6297
DOI - 10.37570/bgsd-1976-25-01
Subject(s) - bay , geology , deposition (geology) , sequence (biology) , geomorphology , geochemistry , transgressive , hydrology (agriculture) , paleontology , oceanography , geotechnical engineering , sedimentary depositional environment , sediment , structural basin , biology , genetics
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.