The BGS Lexicon of Named Rock Units — Result Details
Three Wells Sandstone Member
| Computer Code: | TWSA | Preferred Map Code: | TWSA |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Lochkovian Age (DO) — Pragian Age (DP) | ||
| Lithological Description: | Sandstone, pebbly sandstone and conglomerate with thin andesitic lavas. | ||
| Definition of Lower Boundary: | Passes conformably and diachronously downwards and laterally to the south into the conglomerate of the undivided Catterline Conglomerate Formation, taken at point where sandstone becomes predominant in the upward sequence. | ||
| Definition of Upper Boundary: | Passes conformably and diachronously upward into conglomerate, taken where conglomerate becomes predominant in the undivided Catterline Conglomerate Formation. | ||
| Thickness: | From 46m to 85 m thick, increasing south-eastwards to 360m | ||
| Geographical Limits: | Between Castle of Allardice (NO 818 741), and the foreshore at Narrows Cottage, by Johnshaven. | ||
| Parent Unit: | Catterline Conglomerate Formation (CATC) | ||
| Previous Name(s): | Johnshaven Formation [Obsolete Name And Code: See CATC]
(JNF)
Three Wells Sandstone Formation [Obsolete Name and Code: Use TWSA] (-3738) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Partial Type Section | Along the foreshore from Johnshaven to Narrows Cottage. | ||
| Partial Type Section | Three Wells Quarry, near Inverbervie. | ||
| Reference(s): | |||
| Carroll, S. 1994. Geology of the Inverbervie and Catterline district, 1:10 000 sheets NO87NW, NO87NE and NO87SW. British Geological Survey, Technical Report, WA/94/20. | |||
| Armstrong, M, and Paterson, I B. 1970. The Lower Old Red Sandstone of the Strathmore Region. Report of the Institute of Geological Sciences No. 70/12 | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S067 S057 | |||