Wookey Hole to Split Rock - 2017-09-18
Wookey Hole – Split Rock – Wookey Hole
Led by Jean & Doug
This walk was a little over 3 km, starting in Wookey Hole, and then along Limekiln Lane through Split Rock, past Model Farm and across to Tynings Lane before returning to Wookey Hole.
The walk started in a old quarry in Doug's neighbour’s garden which gives a good section of Dolomitic Conglomerate in which a well displayed normal fault is visible (Fig. 1), displacing the beds by about 1 m. Local houses are built mainly of conglomerate (Fig. 2).
Then we proceeded on to Limekiln Lane (Fig 3 - 4) and Split Rock quarry (Fig. 5 -6) exposing the Carbonifeorus Limestone. Karst features are visible here along with mineralised veins (Fig. 7 - 8), representing infilled fractures/faults associated with the Mendip mineralisation and the very early stages in the opening of the Atlantic ocean.
From here we went across to Tynings lane (Fig. 9), where the Carboniferous limestone on the southern limb of the Pen Hill pericline shows a small fold struture. Then back to Wookey Hole.
[Notes by Doug, pictures & captions by John]
|BGS Crinoid fossils||description [BGS}|
|Normal fault||description [Wikipedia]|
|Dolomitic Conglomerate||description [BGS]|
|Carboniferous Limestone||description [Wikipedia]|