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The lowermost and hence oldest division of the Group is of Asbian age. It comprises mudstones and limestones and delta sandstones, two of which are mapped as separate ‘members’; the Glen and Quarry
Sandstone, the former only being seen west of the Glen Syncline. The thickness of the formation varies
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This Asbian to
Brigantian age formation varies from 45m to 80m thick and consists largely of sandstones and shales with lesser amounts of siltstone and limestone. From its top downwards, it is divided into the Corry, Sheena Shale, Glenkeel, Doobally Sandstone, Drummangarvagh, Lugasnaghta, Sraduffy,
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Mostly dark coloured iron-rich shales of
Pendleian age, it reaches up to 128m thick. From its top downwards, it is divided into the Lacoon Sandstone, Killooman Shale, Tonlegee Shale, Tullyclevaun Shale, Black Mountain Shales and Gubaveeny Shale members.
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Referred to as the
Yoredale Sandstone in the late nineteenth century, this Asbian age sequence varies from 4m thick in County Leitrim to as much as 350m in the north of its range. In places it sits directly on the
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where the
Meenymore Formation rocks are missing due to the locally high relief of the underlying erosive surface. Animal fossils are almost wholly absent from this formation though fragments of
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From 50m to over 160m thick, this
Brigantian age formation is largely shale but contains thin limestones, siltstones and sandstones, some of which are given their own names as
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Geology of the country around
Derrygonnelly and Marble Arch, Memoir of the Geological Survey of Northern Ireland, Sheet 44, 56 and 43 (Northern Ireland)
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Lackagh
Sandstone, Gowlaun Shale, Briscloonagh Sandstone, Dergvone Shale, Carraun Shale, Bellavally, Glenade Sandstone and Meenymore formations
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from 18m at Doagh to 100m to the east of
Cuilcagh Mountain. A depositional hiatus separates this formation from the underlying
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About 53m of
Pendleian age sandstones with interlayered siltstones and some mudstone make up this formation.
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where it forms the prominent cliff-edged summit surface as also at Belmore. It is unfossiliferous.
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Some 50-60m thickness of shales and mudstones of Arnsbergian age constitute this formation.
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Marble Arch Caves Global Geopark; Exploring the landscape of Fermanagh and Cavan
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I.C. Legg, T.P Johnston, W.I. Mitchell & R.A. Smith (1998).
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e.g. the Doagh Limestone and Tawnyunshinagh Limestone members.
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451:(1. ed.). London: The Stationery Office. pp. 26–50.
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which in stratigraphic order (youngest/uppermost at top) are:
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46:but its sources remain unclear because it lacks
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471:: CS1 maint: multiple names: authors list (
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253:coined to refer to the succession of rock
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77:Learn how and when to remove this message
16:Rock strata occurring in Northern Ireland
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904:Geological groups of the United Kingdom
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836:Geological faults of Northern Ireland
369:Larkfield and Tullyskeherny members.
315:The formation is 60-90m thick in the
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585:Basalt columns at Giant's Causeway
386:and leaf remains are more common.
131:Carboniferous Limestone Supergroup
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335:Briscloonagh Sandstone Formation
299:The group comprises a series of
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418:BGS Lexicon of named rock units
889:Carboniferous System of Europe
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815:Ulster White Limestone Group
319:but only about 36m thick on
899:Geology of Northern Ireland
868:Northern Ireland portal
373:Glenade Sandstone Formation
311:Lackagh Sandstone Formation
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780:Hibernian Greensands Group
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251:lithostratigraphical term
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343:Dergvone Shale Formation
32:This article includes a
352:Carraun Shale Formation
327:Gowlaun Shale Formation
61:more precise citations.
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364:Bellavally Formation
770:Benaughlin Mountain
390:Meenymore Formation
317:Connaught Coalfield
98:Stratigraphic range
894:Geology of Ireland
856:Geology portal
587:
34:list of references
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800:Marble Arch Caves
430:(map), 2015 GSNI
321:Cuilcagh Mountain
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516:Northern Ireland
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380:Dartry Limestone
285:Dartry Limestone
259:Northern Ireland
219:County Fermanagh
209:Northern Ireland
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283:overlies the
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274:Carboniferous
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820:Waterloo Bay
810:Tyrone Group
795:Magheramorne
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727:Slieve Croob
664:The Skerries
567:Murlough Bay
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295:Stratigraphy
289:Tyrone Group
279:. The group
246:
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229:Type section
178:conglomerate
149:Tyrone Group
73:
67:January 2020
64:
53:Please help
45:
785:Islandmagee
757:Sedimentary
742:Slieve Muck
702:Mullaghmore
697:Mullaghcarn
687:Loughermore
674:Metamorphic
659:The Maidens
261:within the
106:Arnsbergian
59:introducing
883:Categories
682:Benbradagh
607:Scawt Hill
537:Benevenagh
458:0118845314
403:References
305:sandstones
649:Fair Head
524:Volcanism
467:cite book
384:Calamites
234:Named for
190:siltstone
186:limestone
164:sandstone
155:Lithology
137:Sub-units
775:Cuilcagh
747:Sperrins
547:Cavehill
267:Namurian
200:Location
174:mudstone
145:Overlies
612:Slemish
512:Geology
358:members
287:of the
272:of the
205:Country
194:breccia
160:Primary
127:Unit of
55:improve
455:
434:
301:shales
277:Period
270:stages
263:Visean
255:strata
215:Extent
102:Asbian
829:Lists
641:sills
637:Dykes
552:Divis
249:is a
182:shale
170:Other
121:Group
40:, or
639:and
473:link
453:ISBN
432:ISBN
303:and
291:.
265:and
245:The
117:Type
514:of
104:to
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