| Computer Code: |
ULI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pliensbachian Age (JE)
— Toarcian Age (JT) |
| Lithological Description: |
[Obsolete: use WHM] Mudstones, siltstones and sandstones with limestone nodules and, locally, limestone beds at base. |
| Definition of Lower Boundary: |
Base Toarcian, or base of Toarcian argillaceous/arenaceous rocks resting on calcareous ferruginous Upper Pliensbachian to Lowar Toarcian strata. See notes under "Geographical Limits". |
| Definition of Upper Boundary: |
Top Toarcian, or top of argillaceous/arenaceous strata (Toarcian to, locally, Aalenian) succeeded by calcareous (limestone) and arenaceous strata of the Inferior Oolite Group or Dogger Formation. See notes under "Geographical limits". |
| Thickness: |
Unspecified |
| Geographical Limits: |
The term was used loosely to signify the upper, argillaceous/arenaceous part of the Lower Jurassic succession now known as the Lias Group.. It has commonly been used in a chronostratigraphical rather than lithostratigraphical sense tp mean "Toarcian strata". |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Whitby Mudstone Formation
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Cox, B M, Sumbler, M G, and Ivimey-Cook, H C. 1999. A Formational framework for the Lower Jurassic of England and Wales (Onshore Area). British Geological Survey Research Report No. RR/99/01. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E184
E216
E064
E072
E114
E127
E143
E144
E157
E158
E159
E170
E171
E172
E185
E186
E187
E201
E202
E204
E217
E218
E220
E235
E236
E251
E252
E253
E264
E265
E279
E280
|
