'And' is not required. The footprints were not found and dated; the found footprints were (later) dated,
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moon7296 The oldest human footprints found outside Africa, dated at between 850,000 and 950,000 years old, have been discovered on the storm-lashed beach at Happisburgh in Norfolk, one of the fastest-eroding stretches of the British coast.Q) I think a conjunction "and" is omitted between "Africa" and "dated." Is there any rule or reason when a conjunction is omitted like