All entered the cave after a flood had coated the floor with sandy mud.The researchers describe their analyses July 7 in the in Europe and elsewhere go back no more than 33,000 years.
At a 2011 conference, for instance, scientists reported finding ancient human footprints in Tanzania.
The East African site where they were discovered, Engare Sero, is believed to be 120,000 years old.
But a formal report of those prints has not been published yet in a journal. Perhaps, he says, some problem arose with dating the footprints or proving they are authentic to that site.
Footprints found a half-century ago in a cave in Romania may be the oldest such human impressions in Europe, researchers now conclude. Scientists back then attributed the prints to a man, woman and child who lived 10,000 to 15,000 years ago.
In 1965, about 400 footprints were discovered in the Ciur-Izbuc cave.