| Computer Code: |
TIVO |
Preferred Map Code: |
TiV |
| Status Code: |
Full |
| Age range: |
Brigantian Substage (CX)
— Brigantian Substage (CX) |
| Lithological Description: |
Mainly a hyaloclastite, composed of highly amygdaloidal and partly carbonated basaltic rock fragments. Minor basaltic lavas also occur. |
| Definition of Lower Boundary: |
Taken at the first bed of slumped, laminated dark grey to grey dolomitised limestone containing angular lapilli of amygdaloidal basalt lava (in Lees Farm Borehole, SK 15 SE/12); depth 182.02m. |
| Definition of Upper Boundary: |
Taken at the last occurrence of calcitic igneous rock and mudstone, or of hyaloclastite. This is overlain by calcareous mudstones and thin limestones of the Widmerpool Formation (in Tissington 1 and 2 Boreholes, SK 15 SE/13 and 14). |
| Thickness: |
Up to 44m recorded. |
| Geographical Limits: |
The principal outcrop extends from a locality 250m NW of Pethills (SK 207 493) to about 100m SE of Crakelow Farm (SK 177 535). |
| Parent Unit: |
Widmerpool Formation (WDF)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Near Woodeaves Farm. |
| Partial Type Section |
Lees Farm Borehole (SK 15 SE/12), between 182.02 m. - 152.46 m. |
| Reference Section |
Tissington No. 2 Borehole (SK 15 SE/14) between 26.4 m. - 42.8 m. |
| Reference(s): |
| Chisholm, J I, Charsley, T J, and Aitkenhead, N. 1988. Geology of the country around Ashbourne and Cheadle. Memoir of the British Geological Survey, Sheet 124 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E124
|
