Discoveries at Laetoli in northern Tanzania

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Pliocene deposits at Laetoli in northern Tanzania, known as the Laetolil Beds, have been dated by potassium argon between 3·5 and 3·75 m.y. They have yielded an abundant mammalian fauna and remains of 26 hominids. A deposit of fine grained tuff within the Laetolil Beds has preserved footprints of hominids, mammals and birds. A preliminary description of three hominid trails and a tentative explanation of the means whereby they were preserved is given.

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