2004: The fluviatile Bristol Elv Formation, a new Middle Jurassic lithostratigraphic unit from Traill Ø, North-East

• Main Authors: Jens Therkelsen, Finn Surlyk
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: fluvial; lacustrine; Middle Jurassic sediments; new formation; North-East Greenland; Fleming Fjord; Greenland; Traill Ø; East Greenland; Traill ø
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.6774; http://www.geus.dk/publications/bull/nr5/nr5_p019-029.pdf

A new lithostratigraphic unit, the Bristol Elv Formation, is erected in this paper. It is only known from Traill Ø, East Greenland, where it unconformably overlies Triassic redbeds of the Fleming Fjord Formation and is overlain by lithologically similar shallow marine Upper Bajocian sand-stones of the Pelion Formation. The age of the formation is not well constrained but is probably Early Bajocian. The Bristol Elv Formation is at least 155 m thick and consists of conglomerates, coarse-grained pebbly sandstones and subordinate mudstones, deposited in braided rivers. A finer-grained lacustrine/floodplain unit, c. 37 m thick, is interbedded with the fluvial sandstones at one locality. Deposition of the fluvio-lacustrine Bristol Elv Formation marks a major change in basin configuration and drainage patterns, reflecting the onset of the important, protracted Mid-dle–Late Jurassic rift event in East Greenland.