Yoredale Formation CFYD

 

Premise Formation defined in the United Kingdom by Cameron (1993) .
Derivatio nominis Named after the Yoredale facies of the Upper Dinantian and Lower Namurian, occurring in northeastern England.
Type section Location map See figure (pdf)
  Well E06-01 (pdf)
  Location N 54°46’09.6
E 03°42’09.9
  Depth 2213 to 2356 m
  Length 143 m along hole
  Reference  
Additional section Location map See figure (pdf)
  Well A14-01 (pdf)
  Location N 55°12’01.1”
E 03°36’38.3
  Depth 2823 to 2996 m
  Length 173 m along hole
  Reference  
  Well E02-01 (pdf)
  Location N 54°58’04.3
E 03°34’57.2
  Depth 2055 to 2134 m
  Length 79 m along hole
Definition Cyclic alternation of limestones, claystones, sandstones and rare coal seams. The number of limestone beds is variable.
Upper Boundary The upper boundary is defined by the top of the uppermost well developed limestone bed. The formation is overlain conformably by the Epen Formation, which locally contains some minor carbonate intercalations in its basal part.
Lower Boundary The lower boundary has been placed at the base of the first distinct limestone bed overlying the clastics of the Elleboog Formation.
Distribution The formation occurs in the Elbow Spit High area and along the southern flank of the Mid North Sea High.
Age In the Netherlands a middle Visean (late Holkerian) to early Namurian (early Arnsbergian) age has been determined for this member, indicated by palynomorph biomarkers including Rotaspora fracta, Rotaspora knoxi, Murospora margodentata, Murospora parthenopia, and Vallatisporites ciliaris.
Depositional Setting The formation was deposited under paralic conditions. Frequent marine incursions resulted in the formation of marine limestones and claystones.
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].