The BGS Lexicon of Named Rock Units — Result Details
Glengawna Formation
| Computer Code: | GAA | Preferred Map Code: | GA |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
| Lithological Description: | Interbedded psammite, semi-pelite and graphitic pelite. | ||
| Definition of Lower Boundary: | Gradational boundary with underlying Glenelly Formation. | ||
| Definition of Upper Boundary: | Gradational boundary with overlying Mullaghcarn Formation. | ||
| Thickness: | c.1km | ||
| Geographical Limits: | 0.5-1.5 km wide belt in north County Tyrone, Killyclogher-Gortin Glen to Glenlark. | ||
| Parent Unit: | Southern Highland Group (SOHI) | ||
| Previous Name(s): | Glengawna Formation [Obsolete Code: Use GAA]
(DCGF)
Glengawna Formation (Obsolete Code: Use GAA) [Obsolete Name and Code: Use GAA] (-1549) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Partial Type Section | Lower boundary stratotype. Bottom of last major graphitic schist band in Altavaran Glen, Gortin. | ||
| Partial Type Section | Upper boundary stratotype. Southbank tributary of Glenlark Burn onset of pale grey albitic flags, psammite and schist of Mullaghcarn Formation. | ||
| Reference(s): | |||
| Arthurs, J W. 1976. The geology and metalliferous mineral potential of the Sperrin Mountains area. Geological Survey of Northern Ireland, Special Report No. 1, 119pp, 2app, 2 figs, 7 tables, 102 maps. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| N26 | |||