1. Geology of the Yorkshire Dales
Sat. June 25th 2016
Dr Liam
Herringshaw

2. Today's timetable 10 – 11 Introduction & Early Palaeozoic
11 – Tea break
Early Carboniferous
12.20 – Lunch break
Late Carboniferous
2.00 – Tea break
The Ice Ages
3.20 Discussion

3. Yorkshire Dales geology

4. Sedimentary Dales

5. Time in the Dales (1)
Geogeek
1726

6. Time
in the
Dales
(2)
geolsoc.
org.uk

7. Why the Dales are there

8. Buoyant granite
The Askrigg Block

9. Yorkshire's oldest rocks

10. Yorkshire's oldest rocks
Thornton Force:
Carboniferous rocks overlying metamorphosed Ingleton Group

11. The Ingleton Group Intensely folded, deep marine, sedimentary rocks
Pecca Quarry, photograph © Ashley Dace

12. Not fossiliferous Very rare microfossils found
Pecca Quarry, photograph © Ashley Dace

13. Above the Ingleton, the Lakes
Windermere Supergroup (Ordovician-Silurian turbidites):
Horton Formation (Silurian), Dry Rigg Quarry, nr Helwith Bridge.
Photograph © Karl and Ali

14. Turbidites
Subaqueous sediment gravity flows

15. Also fossil-poor Occasional shell debris found
Photograph © Karl and Ali

16. The Devonian is missing
Combs Quarry, Ribblesdale:
Unconformity between Silurian and Carboniferous rocks

17. Why?
Late Caledonian-Variscan orogeny