| Computer Code: |
MLI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pliensbachian Age (JE)
— Toarcian Age (JT) |
| Lithological Description: |
[Obsolete] Siltstones, sandstones, ironstones and limestones with subsidiary mudstone or sandstone. |
| Definition of Lower Boundary: |
Base of Upper Pliensbachian or base of arenaceous/calcareous strata belonging to either Lower or Upper Pliensbachian. [See notes under "Geographical Limits".] |
| Definition of Upper Boundary: |
Top of Upper Pliensbachian or top of arenaceous/calcareous/ferruginous strata belonging to either the Upper Pliensbachian or the Lower Toarcian. [See notes under "Geographical Limits".] |
| Thickness: |
Unspecified |
| Geographical Limits: |
The term Middle Lias was used as a loose term to signify the middle, arenaceous/ferruginous part of the Lower Jurassic succcession that is now known as the Lias Group. It has commonly been used to mean Upper Pliensbachian strata (ie used in a chronostratigraphical, not lithostratigraphical, sense). |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Staithes Sandstone 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
E064
E072
E114
E127
E143
E157
E159
E170
E171
E172
E185
E186
E201
E202
E204
E217
E218
E220
E235
E236
E251
E253
E265
E279
|
