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Earth Science Conservation Review

Summary Full report
Slieve Gullion Ring - Glendesha ForestArmagh
Site number:1124
ESCC:EO
Locality Type:Scarp face Status: ASSI
Grid Reference: H995171 Centroid
Google maps: 54.09389,-6.47922
County: ArmaghCouncil area:Newry, Mourne & Down District Council
Period:Tertiary
Stages:Palaeogene
Lithostrat:Porphyritic Felsite, Slieve Gullion Complex
Site Description
image: 1124b.jpg Flow-banded Porphyritic Felsite near its outer margin with the vent agglomerate.
Flow-banded Porphyritic Felsite near its outer margin with the vent agglomerate.
Description:
The Porphyritic Felsite ring-dyke forms the steep hillside of Slievebrack; the conspicuous scarp above the outer contact is now hidden by forest trees. Southerly dipping flow structures
image: 1124c.jpg Section above forest track with fresh exposure of vent agglomerate composed almost entirely of Newry Granodiorite fragments.
Section above forest track with fresh exposure of vent agglomerate composed almost entirely of Newry Granodiorite fragments.
follow the contact with vent agglomerate at the base of the scarp. The agglomerate is composed almost entirely of Newry Granodiorite fragments, some of them discoloured by oxidation, and fresh exposures occur beside the forest road as it winds round the southern slope of Slievebrack.
Importance:
A useful excursion locality demonstrating the more sheet-like structure of the ring-dyke as it invades the vent fill.
Notes:


For reference list see; Key Site 1118 - Slieve Gullion Ring - Overview
Keywords
Rocks:Agglomerate, Felsite, Granodiorite
Structures:ring-dyke, volcanic vent
Relations:Contact, Intrusion
Access
Approach:The forest lies E of the road between Carrive Grove and Mullaghbane which traverses the SW slopes of Slievebrack.
Map(s): For site location see the 1:50,000 O.S. Sheet 28 (Monaghan).
Record type: ESCR report    
Entered by: E M Porter
 Enlander, I., Dempster, M. & Doughty, P., 2026. Slieve Gullion Ring - Glendesha Forest, County Armagh, site details. [In] Earth Science Conservation Review.
https://www.habitas.org.uk/escr/site.php?item=1124. Accessed on 2026-11-08.

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