| Computer Code: |
SLED |
Preferred Map Code: |
SL |
| Status Code: |
Full |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
An association of coarse-grained igneous rocks, mainly quartz diorites, occurring as a complex of circular to elongate, roughly overlapping intrusive bodies. |
| Definition of Lower Boundary: |
Where not in mutual contact, the intrusions are believed to have been emplaced into mudrocks of Cambrian to Ordovician (possibly Tremadoc) age, correlatives of the Stockingford Shale Group. |
| Definition of Upper Boundary: |
Where not roofed by their host rocks, the intrusions are unconformably overlain by Triassic strata or Quarternary superficial deposits. |
| Thickness: |
Vertical thickness unknown; boreholes show the complex is approximately 16km in diameter. |
| Geographical Limits: |
Forms isolated and generally quarried outcrops extending from southeast of Sapcote (SP 497 931) northwards to near Enderby (SP 998 535). |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Syenites [Obsolete Name and Code: Use SLED]
(-1826)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Croff Quarry |
| Type Section |
Stoney Cove Quarry. |
| Reference(s): |
| Worssam, B C and Old, R A, 1988. Geology of the country around Coalville. Memoir of the British Geological Survey, Sheet 155 (England and Wales) |
| Le Bas, M J. 1972. Caledonian igneous rocks beneath central and eastern England. Proceedings of the Yorkshire Geological Society, Vol. 39, 71 - 86. |
| Bridge, D M, Carney, J N, Lawley, R S, and Rushton, A W A. 1998. Geology of the country around Coventry and Nuneaton. Memoir of the British Geological Survey, Sheet 169 (England and Wales). |
| Hill, F and Bonney, T G. 1878. On the pre-Carboniferous rocks of the Charnwood Forest, Part II. Quarterly Journal of the Geological Society of London, Vol. 34, 199 - 239. |
| Pharaoh, T C, Brewer, T S and Webb, P C. 1993. Subduction related magmatism of late Ordovician age in eastern England, Geological Magazine, Vol.130, 647 - 656. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E155
E169
|
