The BGS Lexicon of Named Rock Units — Result Details

Falls Of Phones Semipelite Formation

Computer Code: FPHS Preferred Map Code: notEntered
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Semipelite, mainly gneissose but locally schistose, dominantly biotite- (but subsidiary muscovite-garnet-) bearing, with local lenses of micaceous psammite.
Definition of Lower Boundary: Top of the Feshiebridge Psammite Formation (Etteridge Lodge Psammite and Pelite Formation), where interbedded psammite and subordinate semipelite and pelite is overlain by predominantly gneissose biotite-rich semipelite of the Falls of Phones Semipelite Formation.
Definition of Upper Boundary: Base of the Gaick Psammite Formation, where predominantly quartzose and feldspathic psammites overlie the predominantly gneissose biotite-rich semipelite of the Falls of Phones Semipelite Formation
Thickness: c.100m
Geographical Limits: Southeast of the Ericht-Laidon Fault, south of Newtonmore, extending from Crubenmore to Phones Lodge on Sheet 64W.
Parent Unit: Strathtummel Subgroup (STEL)
Previous Name(s): Moine Series (-4042)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Outcrop in the Allt Phoineis, south of Phones Lodge, Newtonmore. Leslie, A G et al., BGS Internal Report IR/03/048. 
Reference(s):
Leslie, A G, Krabbendam, M and Smith, R A, 2003. Progress Report on the Geology of 1:50 k Sheet 64W (Newtonmore) British Geological Survey Internal Report, IR/03/048. 23pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable