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Scientists believe they have uncovered Earth's oldest known footprints in the mountains of Nevada£¨ÃÀ¹úÄÚ»ª´ïÖÝ£©¡ªa fossil find that suggests animals have been walking around about 30 million years longer than previously thought, according to new research.

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The controversial tracks¡ªdescribed by one skeptical scientist as "paired rows of dots"¡ª may indicate animals had legs in the late Protozoic£¨Ô­Éú¶¯ÎïµÄ£© era, about 570 million years ago, according to lead researcher Loren Babcock.

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The discovery is the strongest evidence to suggest animals were able to move about on their own appendages during the Ediacaran period£¨°£µÏ¿¨À­¼Í£©, before the Cambrian£¨º®Îä¼Í£© period "explosion." During the Cambrian complex animals rapidly emerged and replaced simple multicellular£¨¶àϸ°ûµÄ£© animals, said the Ohio State University professor.

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About 570 million years ago, the area was covered by a shallow sea. The water had a mat-like surface made of sediment£¨³ÁµíÎï¡¢³Á»ýÎ grains that were held together by a cohesive network of bacteria and fungi, which would have easily preserved animal tracks.

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The tracks were determined to have been made in the Ediacaran period by comparing the "footprints" layer to previously dated layers with similar features.

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