| Computer Code: |
SYB |
Preferred Map Code: |
SB |
| Status Code: |
Full |
| Age range: |
Ediacaran Period (AD)
— Ediacaran Period (AD) |
| Lithological Description: |
Volcanic block-breccia, angular to sub-rounded blocks of porphyritic (quartz-feldspar) dacite in a crystal-rich coarse tuff matrix. |
| Definition of Lower Boundary: |
Not seen, unit may be wholly enclosed within Sharpley Porphyritic Dacite. |
| Definition of Upper Boundary: |
Sharp contact with overlying Sharpley Porphyritic Dacite; contact is either stratigraphical or the latter unit is intrusive into member. |
| Thickness: |
0-120m |
| Geographical Limits: |
The unit is discontinuous and poorly exposed; the quoted type section and Ratchet Hill reference section are the only known exposures outside Whitwick Quarry. |
| Parent Unit: |
Charnwood Lodge Volcanic Formation (CMCL)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Ratchett Hill. |
| Reference Section |
Whitwick Quarry. |
| Type Section |
Swannymote Rock, and outcrops 200m to west. |
| Reference(s): |
| Carney, J N. 1994. Geology of the Thringstone, Shepshed and Loughborough districts (SK41NW, SK41NE and SK51NW). British Geological Survey Technical Report WA/94/08. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E141
|
