(From NPD Bulletin no. 3)
Named by Deegan and Scull (1977) who gave the unit member status.
Well type section
Norwegian well 9/4-1
(Amoseas) from 2251 m to 2288 m, coord N 57°35'02", E 04°01'13" (Fig. 34, NPD Bulletin no. 3).
Well reference section
from 2215 m, to 2290 m, coord N58°ll'15.4", E03°56'22.2" (Fig. 35, NPD Bulletin no. 3).
37 m in the type well and 75 m in the reference well.
In the type well the formation consists of dark grey micromicaceous shales and siltstones with brownish, locally oolitic, microcrystalline carbonate beds and occasionally sandstone streaks. The latter become more important east and north-east of the type well.
The lower boundary is also the junction of the
Boknfjord Group with the Vestland Group and
is described above. At the base of the formation a more radioactive part
is recognizable in several wells. The upper boundary is marked by the
appearance of the dark grey to black organic-rich shales of the overlying
Tau Formation. The shales of the Tau Formation have a
high radioactivity and a low velocity, and therefore the upper boundary is
marked by strong log breaks.
The formation is distributed throughout the
Fiskebank and Egersund Sub-Basins.
Callovian to Kimmeridgian.
The Egersund Formation was deposited in an open marine, generally low energy basinal environment.