Assertion: footprint | /r/HasProperty | at least 450 prints
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Source sentences:
text: • The earliest footprints in Australia, at least 450 prints in 22 tracks of adults and children, left in hardened silty clay at Willandra Lakes in New South Wales – identified by scientists in 2003 though local people said they already knew of them – have been dated to some 20,000 years ago.