| Computer Code: |
MARRS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Thinly interbedded psammite, semipelite and pelite, with a general upward increase in pelitic material. Garnets are rare to absent and calc-silicate rocks are absent. Locally, quartz pebble conglomerate with a semipelitic matrix. |
| Definition of Lower Boundary: |
Conformably upon the Arnisdale Psammite Member (MAAP). Gradational contact, marked by increasing semipelite beds. |
| Definition of Upper Boundary: |
Conformably overlain by the remainder of the Lower Morar Psammite Formation (MALP) (previously termed 'Barrisdale Psammite'). Sharp incoming of psammite. |
| Thickness: |
c. 200-300 m (estimate, strongly deformed): thins to north and south. |
| Geographical Limits: |
NW Highlands: Morar, Knoydart, Kintail. |
| Parent Unit: |
Lower Morar Psammite Formation (MALP)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Ramsay, J.G. and Spring, J., 1962. Moine stratigraphy in the Western Highlands of Scotland. Proceedings of the Geological Association, 73: 295-326. |
| Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. |
| Krabbendam, M, Leslie, A, and Goodenough, K. 2014. Structure and stratigraphy of the Morar Group in Knoydart, NW Highlands: implications for the history of the Moine Nappe and stratigraphic links between the Moine and Torridonian successions. Scottish Journal of Geology, Vol. 50, 125-142. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
