Geoscience Reference
In-Depth Information
Fig. 6. Fluvial sandstones from the Britta Dal Formation, Nathorst Bjerg. (a) Sequence of sandstone beds showing
flat bases indicating origin as extensive flooding events that were not channelized. (b) Group of fluvial sandstones
showing their significant lateral extent. Sandstone bed thicknesses are c. 1 m. (c) and (d) Single sand body showing
combination of flat base and wide lateral extent; (d) has been annotated to show the lateral scour surfaces. Height of
sandstone body c. 1.5 m.
composite events with major internal reactivation
surfaces (Fig. 6c, d). These include very large
scours (Fig. 6c, d) that developed prior to flood
waning,
accretion of sediment. There is no evidence for
lateral accretion within these sand bodies in contrast
to the Aina Dal Formation. The Britta Dal For-
mation sandstones can occur anywhere within
channel
abandonment
and
vertical
