| Computer Code: |
HWD |
Preferred Map Code: |
HWD |
| Status Code: |
Full |
| Age range: |
Telychian Age (ST)
— Telychian Age (ST) |
| Lithological Description: |
At outcrop, flaggy, blue-grey, calcereous sandstones with interbedded olive siltstones and overlain by purple and olive siltstones; in Fownhope Borehole, green-grey siltstones with minor claystones (107.7 m. proved) overlain by 135.3 m. of green-grey sandstones with interbedded siltstones. |
| Definition of Lower Boundary: |
Not seen at outcrop; placed at 982 feet in Fownhope Borehole, where green-grey siltstones of the Yartleton (Haugh Wood) Formation overlie interbedded siltstones and sandstones of the Huntley Hill Formation. |
| Definition of Upper Boundary: |
Base of limestone of the Woolhope Limestone Formation. |
| Thickness: |
93m at outcrop (base not seen); 243m drilled in Fownhope Borehole. |
| Geographical Limits: |
Woolhope Inlier |
| Parent Unit: |
May Hill Sandstone Group (MHS)
|
| Previous Name(s): |
Upper Haugh Wood Beds And Lower Haugh Wood Beds
(-972)
|
| Alternative Name(s): |
Yartleton Formation
|
| Stratotypes: |
| Type Area |
Haugh Wood area, Woolhope. Squirrell & Tucker 1960. |
| Reference(s): |
| Squirrell, H C and Tucker, E V. 1982. Woolhope and Gorsley. In the Silurian Inliers of the South-eastern Welsh Borderland. Geologists' Association Guide, No.5. |
| Worssam, B C, Ellison, R A and Moorlock, B S P. 1989. Geology of the country around Tewkesbury. Memoir of the British Geological Survey, Sheet 216 (England and Wales). |
| Lawson,J D. 1954. The geology of the May Hill Inlier. Quarterly Journal of the Geological Society of London, Vol. III, 85 - 116 |
| Squirrell, H C and Tucker, E V. 1960. The geology of the Woolhope Inlier (Herefordshire). Quarterly Journal of the Geological Society of London, Vol.116, 139-185. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
