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The HS2 high-speed rail link will connect London to Birmingham, Manchester and Leeds.
It is the biggest infrastructure project in Europe, but has been delayed and faced concerns over the exact route and spiralling costs.
A Stonehenge-style wooden formation and Roman burial have also been discovered.
They are among a number of finds ranging from the Neolithic Age to the Medieval period unearthed ahead of construction work for the 225mph (362 km/h) rail line.
A large Neolithic circular monument of wooden posts 65m (213 ft) in diameter and aligned with the winter solstice, "similar to Stonehenge", was uncovered.
The site also has evidence of domestic occupation during the Bronze to Iron Ages (3000BC to AD43), including a roundhouse and animal pits.
There have been a number other finds uncovered during this ongoing project
Archaeologists digging up the site of Birmingham's main HS2 train station have uncovered what could be the 'world's oldest railway roundhouse
The roundhouse, based on a design by Robert Stephenson was discovered on the site of the original Curzon Street station which operated from the 1830s to 1960s.
The Victorian building is thought to have been among the structures demolished from 1860 to 1870 to allow for the expansion of the station.
Historians say it was first operational as early as November 12 1837, meaning it predated a similar building in Derby by almost two years.