# Manx Group

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Manx_Group
> Markdown URL: https://mediated.wiki/source/Manx_Group.md
> Source: https://en.wikipedia.org/wiki/Manx_Group
> Source revision: 1293975790
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

The **Manx Group** is an [Ordovician](/source/Ordovician) [lithostratigraphic](/source/Lithostratigraphy) [group](/source/Group_(stratigraphy)) (a sequence of [rock strata](/source/Rock_strata)) in the [Isle of Man](/source/Isle_of_Man) in the [Irish Sea](/source/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](/source/Mudstone) with [siltstone](/source/Siltstone) laminae and some [sandstones](/source/Sandstone) 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:

- Ladyport—faulted boundary--
- Creggan Mooar
- Glen Rushen
- Injebreck
- Barrule—faulted boundary--
- Maughold
- Creg Agneash
- Mull Hill
- Lonan - Ny Garvain member - Santon member - Keristal member—faulted boundary--
- Glen Dhoo

## References

1. ["Manx Group"](http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=MANX). *The BGS Lexicon of Named Rock Units*. British Geological Survey. Retrieved January 20, 2019.

1. *Isle of Man solid and drift geology, 1:50,000 scale*. British Geological Survey, NERC. 2001. ISBN 0751833266.

- The Geological Society (2006). *The Geology of England.*. 2. ed. Brenchley, P.J. (ed.). London: Geological Society Publishing. pp. 194, 195. ISBN 9781862392007.

---
Adapted from the Wikipedia article [Manx Group](https://en.wikipedia.org/wiki/Manx_Group) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Manx_Group?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.