| Computer Code: |
ASG |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Marsdenian Substage (CZ)
— Marsdenian Substage (CZ) |
| Lithological Description: |
[Obsolete: use COG] Massive or cross-bedded, medium to coarse grained, often pebbly and feldspathic sandstone. |
| Definition of Lower Boundary: |
The base of the first main sandstone or sandstones above the Bilinguites Marine Band. If no Marine Bands are proved it is the base of the third (not all of the sandstones may be present) main sandstone or group of sandstones below the top of the Millstone Grit Group. |
| Definition of Upper Boundary: |
The top of the first main sandstone or sandstones below the Bilinguites Marine Band. If no Marine Bands are proved it is the top of the third (not all of the sandstones may be present) main sandstone or group of sandstones below the top of the Millstone Grit Group. |
| Thickness: |
Up to 213 m thick. |
| Geographical Limits: |
Derbyshire, Leicestershire, Nottinghamshire. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Third Grit [Obsolete Name and Code: Use ASG]
(-2568)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Smith, E G, Rhys, G H and Eden, R A. 1967. Geology of the country around Chesterfield, Matlock, and Mansfield. Memoir of the Geological Survey of Great Britain. England and Wales Sheet 112. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E125
E126
E111
E099
E142
E141
|
