The BGS Lexicon of Named Rock Units — Result Details
Tarfside Psammite Formation
| Computer Code: | TPS | Preferred Map Code: | litho |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
| Lithological Description: | Psammite, much of it quartzitic, and calcareous psammite, with minor pelite and semipelite, passing up into mixed psammite and semipelite: beds of meta-limestone and calc-silicate rock throughout. | ||
| Definition of Lower Boundary: | Top of Deeside Limestone Formation - change from dominant calc-silicate rock to dominant psammite. | ||
| Definition of Upper Boundary: | Base of Glen Effock Schist Formation - change to semipelite with much psammite and pelite: marked by incoming of magnetic horizons within the semipelites. | ||
| Thickness: | (i) Probably no more than 500m north of Mount Battock Granite (top not seen): (ii) 1250 - 2750m south of Mount Battock Granite; upper figure probably overestimate, due to tectonic thickening of Glen Turret Member. | ||
| Geographical Limits: | (i) Deeside: North of Mount Battock Granite, south of Deeside Limestone Formation [NO 420 957 to 560 955] (ii) Tarfside: South of Mount Battock Granite, north of Glen Effock Schist Formation [NO 405 846 to 570 817]. (iii) Sheet 65E. Strip bounded to east by Water of Tanar Limestone Formation, to west by the Glen Effock Schist Formation [NO 415 952 to 370 800]. Southern boundary is lateral transition to Cald Burn Gneiss Formation. | ||
| Parent Unit: | Tayvallich Subgroup (DBTV) | ||
| Previous Name(s): | Glen Tanar Quartzite and Mica Schist Group [Obsolete Name and Code: Use TPS]
(-2499)
Tarfside Group [Obsolete Name and Code: Use TPS] (-3731) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | (Sheet 66W) (ii) South of Mount Battock Granite. (Glen Turret Psammite and Semipelite Member). Burn of Turret Section from R. North Esk to granite contact. | ||
| Type Area | Sheet 65E (Ballater). Good section in Water of Lee and also in the Burn of Badrone [NO 3670 8145 to 3660 8200]. | ||
| Type Area | Sheet 66W are those for component members Glen Tanar Quartzite and Glen Turret Psammite and Semipelite members: north of Mount Battock Granite. Good exposures in the banks of the Water of Tanar from 100m above to 50m below the Brig O' Ess. | ||
| Type Area | (Sheet 66W) (i) South of Mount Battock Granite (Glen Tanar Quartzite Member). Part of Branny Burn Section. | ||
| Reference(s): | |||
| Smith, C G, Goodman, S and Robertson S. 2003. Geology of the Ballater district. Memoir of the British Geological Survey, Sheet 65E (Scotland). | |||
| Harte, B, 1979. The Tarfside succession and the structure and stratigraphy of the eastern Scottish Dalradian rocks. "In" Harris, A L, Holland, C H and Leake, B E. Geological Society of London Special Publication No.8, p.221-228. | |||
| Read, H H, 1928. The Highland Schists of Middle Deeside and Upper Glen Muick. Transactions of the Royal Society of Edinburgh, Vol.55, p.755-772. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S065 S066 S066 | |||