Builders at a college in East Yorkshire have stopped work after finding objects dating back to the Iron Age.
The workers constructing a sports court at Wilberforce College, Hull, have made way for experts from Humber Field Archaeology to inspect the site.
Digs at the site in the east of the city date back to the 1960s and there was archaeological work there in 2010.
David Cooper, vice-principal at the college, said: "This is a really important site."
It is thought the objects found are shards of Iron Age pottery.