After graduating she worked as a wartime postal censor and freelance photojournalist, whilst continuing to volunteer on archaeological excavations around Britain.
In 1956, Jones began working for the Ministry of Works as a freelance archaeologist in the burgeoning field of rescue archaeology.
She worked at a number of sites, but is best known for her excavations at Mucking, a major Anglo-Saxon settlement and associated cemetery, with finds ranging from the Stone Age to the Medieval period.
The Mucking excavation, which Jones directed from 1965 to 1978, became Britain's largest ever archaeological excavation.
It produced an unprecedented volume of material, although some academic archaeologists have criticised the fact that the results did not appear in print until decades after the excavation had ended.
Jones' work at Mucking, as well as her role in founding the campaign group Rescue, was influential in the establishment of modern commercial archaeology in Britain.