Ride the Storm: Navigating Through Unstable Periods / Katerina Rudko (Belka G...
Portesham powerpoint gt
1. 19th century 6” OS map of Portesham, showing the quarries that provided limestone from both the Portland Freestone and the Purbeck Cypris Freestones
Reproduced with the permission of the National Library of Scotland. From their website http://maps.nls.uk/os/6inch-England-and-wales/
Portland
Freestone
Portland
Freestone
Portland Chert
and Freestone
Kimmeridge
Shale