Cementstone Formation CFCS

 

Premise  
Derivatio nominis Named after the British stratigraphic unit Cementstone Group of northeastern England with which this formation can be correlated.
Type section Location map See figure (pdf)
  Well E06-01 (pdf)
  Location N 54°46’09.6
E 03°42’09.9
  Depth 2547 to 2755 m
  Length 208 m along hole
Additional section Location map See figure (pdf)
  Well E02-01 (pdf)
  Location N 54°58’04.3
E 03°34’57.2
  Depth 2318 to 2392 m
  Length 74 m along hole
Definition Cyclic alternation of carbonates, claystones, sandstones and minor coal seams. The carbonates occur as limestone, dolomitic limestone and dolomite beds.
Upper Boundary The upper boundary has been defined at the top of the uppermost carbonate bed, which is overlain conformably by the clastics of the Elleboog Formation.
Lower Boundary The base of the formation has been placed at the base of the lowermost distinct carbonate bed which conformably overlies the Tayport Formation.
Distribution The formation occurs in the Elbow Spit High area and along the southern flank of the Mid North Sea High.
Age A Tournaisian (Courceyan) age has been established for the Cementstone Formation on the basis of palynomorphs. Most characteristic is the absence of Crassispora kosankei, which has its first appearance in the Visean and which has a common occurrence in the rest of the Carboniferous. In the UK sector the presence of Vallatisporites vallatus has proven to be indicative for a Courceyan age.
Depositional Setting The unit was deposited under paralic conditions with repeated marine incursions, during which marine limestones and claystones were formed.
References See References Upper Carboniferous

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].