Manx Group

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Manx Group
Stratigraphic range: Tremadocian to Arenig substages of Ordovician
Type Group
Sub-unitsGlen Dhoo, Lonan, Mull Hill, Creg Agneash, Maughold, Barrule, Injebreck, Glen Rushen, Creggan Mooar and Ladyport Formations
Underlies Dalby Group (probably unconformably)
Thicknessat least 3,000 m (9,800 ft)
Lithology
Primary mudstone
Other siltstone, sandstone
Location
Region Isle of Man
CountryUnited Kingdom (Crown dependency)
Extentalmost all of Isle of Man
Type section
Named for Isle of Man

The Manx Group is an Ordovician lithostratigraphic group (a sequence of rock strata) in the Isle of Man in the Irish Sea. The name is derived from the name of the island which is largely formed from them; these rocks have also previously been referred to as the Manx Slates or Manx Slates Series. The group comprises dark mudstones with siltstone laminae and some sandstones and which exceed a thickness of 3000m. It is divided into a lowermost Glen Dhoo Formation which is overlain by (though the entire known boundary is faulted) the Lonan, Mull Hill, Creg Agneash and Maughold formations in ascending order. A fault separates these from the overlying Barrule, Injebreck, Glen Rushen and Creggan Mooar formations which are in turn separated by a fault from an overlying Ladyport Formation. [1] [2]

In stratigraphic order (youngest at top) the formations are:

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References

  1. "Manx Group". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved January 20, 2019.
  2. Isle of Man solid and drift geology, 1:50,000 scale. British Geological Survey, NERC. 2001. ISBN   0751833266.