Quary in Cambrian quartzite.
External Links
- https://en.wikipedia.org/wiki/The_Ercall
- https://explorethewrekin.co.uk/wildlife-sites/the-ercall/
- https://geoguide.scottishgeologytrust.org/page/1488
- https://ougs.org/files/wmi/reports/Ercall_Quarries_Shropshire.doc
- https://shropshiregeology.org.uk/wrekin-2/
- https://www.wellingtonla21.org.uk/the-ercall/
