![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/4/45/Portland.stone.cenotaph.london.arp.jpg/640px-Portland.stone.cenotaph.london.arp.jpg&w=640&q=50)
Portland limestone
limestone quarried on the Isle of Portland, Dorset, England / From Wikipedia, the free encyclopedia
Portland limestone is a limestone which was deposited in the latest stage of the Upper Jurassic period. It was first found on the Isle of Portland, Dorset.[1] However, it occurs over a much wider area, including France.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/45/Portland.stone.cenotaph.london.arp.jpg/640px-Portland.stone.cenotaph.london.arp.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/PortlandQuarry.jpg/640px-PortlandQuarry.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/34/Michael_Dan_Archer%2C_Full_Fathom_Five_%E2%80%93_Seafarer%27s_Monument_%282007%E2%80%932008%29_in_Portishead%2C_Somerset%2C_UK.jpg/640px-Michael_Dan_Archer%2C_Full_Fathom_Five_%E2%80%93_Seafarer%27s_Monument_%282007%E2%80%932008%29_in_Portishead%2C_Somerset%2C_UK.jpg)
The strata are beds of white-grey limestone separated by beds of chert.