{{Short description|Group of volcanic rock formations in northwestern England}} {{Infobox rockunit | name = Eycott Volcanic Group | image = | caption = | type = [[Group (stratigraphy)|Group]] | age = [[Ordovician]] ([[Llandeilo]] to [[Caradoc]] epochs) | prilithology = [[andesite|andesitic]] lavas and sills | otherlithology = volcanic [[breccia]]s, [[tuff]]s, [[sandstone]] | namedfor = Eycott Hill | namedby = | region = [[Cumbria]] | country = [[England]] | coordinates = | unitof = | subunits = Potts Ghyll Formation, Overwater Formation | underlies = [[unconformity]] | overlies = [[Skiddaw Group]] | thickness = to 3200m | extent = northern [[Lake District]] & [[Melmerby, Cumbria|Melmerby Fell]] inlier | area = | map = | map_caption = }}
The '''Eycott Volcanic Group''' is a [[group (stratigraphy)|group]] of [[volcanic]] rock formations of [[Ordovician]] age ([[Ordovician#Subdivisions|Llandeilo]] to [[Ordovician#Subdivisions|Caradoc]] [[epoch (geology)|epochs]]) named after the locality of Eycott Hill in the English [[Lake District]].<ref>British Geological Survey 1997 ''Cockermouth'' England and Wales sheet 23 Solid 1:50,000 Keyworth, Nottingham, BGS</ref> The group overlies the [[Lake_District#Northern_Fells|Skiddaw Group]] and is [[unconformity|unconformably]] overlain by a variety of different [[Devonian]] and [[Carboniferous]] age rocks.
This rock sequence has previously been known as the '''Eycott Group'''.<ref name="BGS_Lexicon">{{Cite web |url=https://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=EVG |title=Eycott Volcanic Group |last=[[British Geological Survey]] |website=BGS Lexicon of Named Rock Units |access-date=21 October 2019}}</ref> It consists largely of [[andesite|andesitic]] [[lava]]s and [[sill (geology)|sills]] with [[tuff]]s, [[breccia]]s and volcaniclastic [[sandstone]]s. Its main outcrop is in an east-west oriented band of country in the northern part of the Skiddaw range in the northern Lake District stretching from the village of [[Bothel, Cumbria|Bothel]] east to form the hill of [[Binsey, Cumbria|Binsey]] and further east, the more extensive [[Caldbeck |Caldbeck Fells]]. A smaller outcrop underlies [[Greystoke Castle|Greystoke Park]] just to the east of this area and forms Eycott Hill east of [[Mungrisdale]]. There is a further [[inliers and outliers (geology)|inlier]] at [[Melmerby, Cumbria|Melmerby Fell]] in the [[North Pennines]]. The outcrops are intensely faulted and in the Caldbeck area are crossed by numerous [[vein (geology)|mineral veins]] yielding [[arsenic]], [[barium]], [[copper]] and [[lead]] which have been worked in the past.
==See also== * [[Borrowdale Volcanic Group]]
== References == {{reflist}}
[[Category:Geological groups of the United Kingdom]] [[Category:Geology of Cumbria]]