| Computer Code: |
USL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Famennian Age (DA)
— Famennian Age (DA) |
| Lithological Description: |
Cream, buff, green, grey and purple slates and silty slates; cleavage and bedding commonly dip steeply to the west-south-west and the beds are locally overturned. |
| Definition of Lower Boundary: |
Slates and slaty shales above the junction with the underlying Pickwell Down Sandstones contain scattered thin beds of red fine grained sandstone. At Napps Cliff [SS 4460 4072] the contact is stratigraphic and gradational over approximately 9 m of strata; progressively higher sandstones become thinner and finer-grained and give way to predominant siltstones, silty slates and slates in the Upcott Beds. |
| Definition of Upper Boundary: |
160 m south of Whiting Hole [SS 4215 4086], slates, silty slates and siltstones of the Upcott Slates dip around 70 degrees to the south-south-west, and the contact with the overlying Baggy Sandstones is seen to be sharp and conformable. The topmost slates of the Upcott Slates accommodate load casts of the overlying sandstone. |
| Thickness: |
Approx. 250 m on coast. |
| Geographical Limits: |
Exposed in near-strike section on the coast between Napps Cliff [SS 444 407] and Whiting Hole [ SS 4215 4086]. Inland, the outcrop of the Upcott Slates extends as a narrow band eastwards from Winsham [SS 499 388], swings through North Heasley [SS 732 332] and North Molton around the flanks of an anticline, then extends further east, affected by faulting, to 4.5 km east of Dulverton [SS 9640 2790]. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Section along the northern side of Baggy Point headland between Napps Cliff and Whiting Hole. Hull, 1880; Edmonds et al., 1979. |
| Reference(s): |
| Goldring, R. 1971. Shallow-water sedimentation as illustrated in the Upper Devonian Baggy Beds. Memoir of the Geological Society of London. No.5. |
| Edmonds, E A, Williams, B J and Taylor, R T. 1979. Geology of Bideford and Lundy Island. Memoir of the Geological Survey of Great Britain, Sheets 292 with 275, 276, 291, and part of 308 (England and Wales). |
| Edmonds, E A, Whittaker, A, and Williams, B J. 1985. Geology of the country around Ilfracombe and Barnstaple. Memoir of the British Geological Survey, Sheets 277 and 293 (England and Wales). |
| Hull, E. 1880. On the geological relations of the rocks of the south of Ireland to those of north Devon and other British and Continental Districts. Quarterly Journal of the Geological Society, London, Vol. 36, pp 255-276. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
