| Computer Code: |
THSS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Albian Age (KA)
— Albian Age (KA) |
| Lithological Description: |
Green and red glauconitic sandstone, generally fine-grained, clay-free and well-sorted, with several layers of chertified sandstone. A massive basal conglomerate is locally developed and in places strongly silicified, with oyster-encrusted pebbles and scattered corals. Lenses of shelly, indurated sandstone containing silicified bivalves occur in the lower part of the member. |
| Definition of Lower Boundary: |
Unconformable contact with Permian breccias. In some places the unconformity is irregular and overlain by a massive, locally silicified, highly fossiliferous conglomerate; elsewhere the unconformity is relatively flat and overlain by a bed of derived pebbles. |
| Definition of Upper Boundary: |
Contact with the overlying Woodlands Sands Member, marked by an upward facies-change to coarser, less well-sorted and more clay-rich sandstone. |
| Thickness: |
Up to 5.26m. |
| Geographical Limits: |
Haldon Hills in Devon (Sheet 339). |
| Parent Unit: |
Upper Greensand Formation (UGS)
|
| Previous Name(s): |
Haldon Sands [Obsolete Name and Code: Use UGSD, ACGR, CUSC, THSS, WLSS]
(-1299)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Temporary road cutting at Woodlands Goyle [SX 902 840], at the north end of Great Haldon, Selwood et al. (1984). |
| Type Section |
Road cutting [SX 912 836], Telegraph Hill, Great Haldon, Selwood et al. (1984). Exposed the full succession when opened. |
| Reference(s): |
| Ussher, W A E. 1913. Geology of the country around Newton Abbot. Memoir of the British Geological Survey, Sheet 339. (England and Wales). |
| Hamblin, R J O and Wood, C J. 1976. The Cretaceous (Albian-Cenomanian) stratigraphy of the Haldon Hills, south Devon, England. Newsletters on Stratigraphy, Vol.4, 135-149. |
| Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). |
| Jukes-Browne, A J and Hill, W. 1900. The Cretaceous Rocks of Britain. 1. Gault and Upper Greensand. Memoir of the Geological Survey of Great Britain. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
