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On its own, this was not enough evidence to confirm a burial ground.
Archaeologists also hope to find Roman artefacts as they dig deeper.
The 16 Century historian John Stow stated that more 150,000 victims of the Black Death were buried in London.
According to Stow, there was a burial ground in Farringdon known as ‘No Man’s Land’ which was established in 1348, and was subsequently used to bury more than 50,000 victims of the Black Death.
It is thought that the burial ground at Charterhouse continued in use as the monastery developed through to the mid-16 The Farringdon site is the latest find made as part of the UK’s largest archaeology programme taking place across more than 40 Crossrail worksites.
Among the other artefacts that have been found are, the UK’s largest piece of amber ever discovered, bones from huge prehistoric animals that roamed the iced-covered London plains and items used by humans during the Bronze Age, Roman and Medieval times.
When Crossrail opens it will increase London's rail-based transport network capacity by 10%, supporting regeneration and cutting journey times across the city.