| Computer Code: |
NORH1 |
Preferred Map Code: |
SYMBOL |
| Status Code: |
Full |
| Age range: |
Cambrian Period (E)
— Cambrian Period (E) |
| Lithological Description: |
Albite-porphyritic metablast, locally deformed to a phyllite. |
| Definition of Lower Boundary: |
Tectonic base - imbricate thrust zone. |
| Definition of Upper Boundary: |
Tectonic top - imbricate thrust stack. |
| Thickness: |
Unknown. |
| Geographical Limits: |
The main mass is about 1.5 km long and extends inland from Norwick, a small lens crops out on the coast at The Clifts, Norwick, Unst |
| Parent Unit: |
Shetland Ophiolite Complex (SHOP)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Poorly exposed in ditches and stream beds around the Norwick area and at the base of the sea cliff at the Clifts, Norwick, Unst. Flinn, 1993 |
| Reference(s): |
| Read H H. 1934. The metamorphic history of the Unst in the Shetland Islands Quarterly Journal of the Geological Society of London, 90, 637-88. |
| Flinn, D, Miller, J A, and Roddom, D. 1991. The age of the Norwick hornblendic schists of Unst and Fetlar and the obduction of the Shetland ophiolite. Scottish Journal of Geology, 27 (1), 1-80. |
| Flinn, D. 1993. New evidence that the high temperature hornblende-schists below the Shetland ophiolite include basic igneous rocks intruded during obduction of the 'cold' ophiolite. Scottish Journal of Geology, 29(2), 159-65. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S131
|
