Coarse‐grained, marine, sub‐wave base, high‐angle clinoform sets: A little‐known outcrop facies illustrated by Jurassic examples from East Greenland

Abstract

Recently much focus has been on sandy, high-angle subwave base clinoform sets which were termed 'Subaqueous delta-scale, high-angle sandy clinoforms' in the review by Patruno and Helland-Hansen (2018). Geometrically, they are very similar to Gilbert-type deltas but they are mainly formed close to storm wave base in shallow seas. The term

Uplift, deflation and marine onlap of a Jurassic rift dome, illustrated by a backstepping Middle–Upper Jurassic shelf‐to‐slope succession, Geographical Society Ø, East Greenland

“…An up to 10 m thick clinoform set is exposed in the middle of the succession with a progradation direction roughly towards the SE away from the basin bounding fault. This is similar to other Middle Jurassic clinoform sets known from Jameson Land and Milne Land (Surlyk & Larsen, 2023). These clinoform sets are interpreted as reflecting creation of new rift‐controlled accommodation space associated with progradation away from the coastline fed by offshore‐directed downwelling currents during major storms.…”

“…The sets represent the shelf‐slope break and position of the clinoform rollover (cf. Surlyk & Larsen, 2023). Downslope transitions from clinoform sets to structureless slope and base‐of‐slope sandstones are well known from the Volgian Raukelv and Sjællandselv Formations in southernmost Jameson Land (Surlyk, 2003; Surlyk et al, 2007, 2021).…”