| Computer Code: |
TYC |
Preferred Map Code: |
Tyc |
| Status Code: |
Pending Upgrade |
| Age range: |
Hirnantian Age (OH)
— Rhuddanian Age (SR) |
| Lithological Description: |
Turbidite mudstones, thinly interbedded within packets dominated either by laminated or burrowed hemipelagites. Sporadic thin turbidite sandstones. Locally slumped. |
| Definition of Lower Boundary: |
Sharp incoming of less silty mudstones, with units of burrowed and laminated hemipelagites, above the coarse silty micaceous mudstones of the Yr Allt Formation. |
| Definition of Upper Boundary: |
Taken at base of first pebbly mudstone or conglomerate of overlying Allt-Y-Clych Conglomerate. |
| Thickness: |
350m |
| Geographical Limits: |
Central Wales, east of Tywi Anticline. |
| Parent Unit: |
Not Entered (?)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Bed of River Wye, east of Tywcwtta, north of Newbridge on Wye. |
| Reference(s): |
| none recorded or not applicable |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E179
|
