Computer Code: |
LMM |
Preferred Map Code: |
LMM |
Status Code: |
Pending Upgrade |
Age range: |
Wenlock Epoch (SW)
— Wenlock Epoch (SW) |
Lithological Description: |
Calcareous siltstone, dark grey to black mudstone and irregular mottled mudstone. Shelly fauna. Massive bedding. |
Definition of Lower Boundary: |
Contrasts with the ribbon-banded silty mudstones of the Nantglyn Flags. |
Definition of Upper Boundary: |
Contrasts with the ribbon-banded silty mudstones of the Nantglyn Flags. |
Thickness: |
12 - 76m |
Geographical Limits: |
Not defined. |
Parent Unit: |
Nantglyn Flags Formation (NGF)
|
Previous Name(s): |
Mottled Mudstones [Obsolete Name and Code: Use UMM, LMM]
(-2294)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Warren, P T, Price, D, Nutt, M J C and Smith, E G. 1984. Geology of the country around Rhyl and Denbigh. Memoir for 1:50 000 geological sheets 95 and 107 and parts of sheets 94 and 106. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E120
E149
E094
E107
|