| Computer Code: |
ARPS |
Preferred Map Code: |
ArPs |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Medium- to thickly-bedded psammite and semipelite; coastal section contains a basal quartzite member; elsewhere locally contains units of 'boulder bed', a metadiamicton with sparse cobble clasts of granitic and metasedimentary rocks. |
| Definition of Lower Boundary: |
Base faulted out in coast section; elsewhere rapid transition is inferred from graphitic semipelites and limestones of Fordyce Limestone Formation. |
| Definition of Upper Boundary: |
Change from interbedded psammite and semipelite to thick-bedded quartzite. |
| Thickness: |
Increases from c.75m at Newton [542 619] to c.200m at coast, where it is partly repeated by a ductile thrust of the Keith Shear Zone. |
| Geographical Limits: |
Coast section from Red Haven to 150m southeast of Foul Hole [NJ 563 663-579 666]; extends southwards as far as Newpark [NJ 530 606]. |
| Parent Unit: |
Islay Subgroup (DBIS)
|
| Previous Name(s): |
Durn Hill Quartzite [Obsolete Name and Code: Use ARPS]
(-26)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Coastal section from to Red Haven to 150m south-east of Foul Hole. |
| Reference(s): |
| Spencer, A M and Pitcher, W S, 1968. Occurrence of the Portaskaig Tillite in north-east Scotland. Proceedings of the Geological Society of London, No.1650, 195-198. |
| Stephenson, D, et al. 1993. Stratigraphy and correlation of the Dalradian rocks of the East Grampian Project area. British Geological Survey Technical Report WA/93/91. |
| Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. |
| Read, H H, 1923. Geology of the country around Banff, Huntly and Turriff, Lower Banffshire and north-west Aberdeenshire. Memoir of the Geological Survey, Scotland Sheets 86 and 96 (Scotland). |
| Stephenson, D and Gould, D. 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S096
|
