Manx Group

The Manx Group is an <a href="/facts/Ordovician/BjMrLIEA">Ordovician</a> <a href="/facts/Lithostratigraphy/KhskmKLs">lithostratigraphic</a> <a href="/facts/Group_(stratigraphy)/6xrtdqIy">group</a> (a sequence of <a href="/facts/Rock_strata/w5D4VAwa">rock strata</a>) in the <a href="/facts/Isle_of_Man/HG7bYyA8">Isle of Man</a> in the <a href="/facts/Irish_Sea/m2SqNwvx">Irish Sea</a>. 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 <a href="/facts/Mudstone/KWLvUash">mudstones</a> with <a href="/facts/Siltstone/sI119qT3">siltstone</a> laminae and some <a href="/facts/Sandstone/RP8B6fqL">sandstones</a> 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.
In stratigraphic order (youngest at top) the formations are:

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

<ul><li>The Geological Society (2006). Brenchley, P.J. (ed.). The Geology of England (2. ed.). London: Geological Society Publishing. pp. 194, 195. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 9781862392007.</li></ul>

Manx Group open-in-new

Manx Group