Puzzle Hole Formation

SLCP

Formal (NAM & RGD 1980). Amended (Herngreen & Wong 1989; Van Adrichem Boogaert & Kouwe 1993).

Light brownish-grey carbonaceous claystones with intercalations of siltstones and thin sandstones. Coal seams are frequent. The sandstones, in particular to the south, show a fining-upward character. Typical serrate pattern on both gamma-ray and sonic logs as a result of the rapid alternation of thin sandstones, siltstones, claystones and coal seams.

Lower delta plain; lagoonal tidal flats, estuary and tidal channels, bay head deltas and mouthbars.

Conformably overlies the Middle Graben Formation.

Overlain unconformably by sediments of the Rijnland Group or younger groups as a result of Sub-Hercynian/Laramide inversion erosion. In the type section (Van Adrichem Boogaert & Kouwe 1993), however, the marine claystones of the Kimmeridge Clay Formation conformably overlie the Puzzle Hole Formation.

Up to 500 m (F14-04).

UK: Humber Group; GER: ?; BEL: -.

middle Oxfordian - early Kimmeridgian.

Named after the Puzzle Hole Bank in the Dutch northern offshore region.

None.

Sander Houben (2017).

NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.

Herngreen, G.F.W. and Wong, Th.E. 1989. Revision of the ’Late Jurassic’ stratigraphy of the Dutch Central North Sea Graben - Geol. en Mijnbouw, 68, p. 73-105.

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1993. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section G, Upper Jurassic and Lower Cretaceous. Mededelingen Rijks Geologische Dienst, 50, 1-80..