Hominin footprints from early Pleistocene deposits at Happisburgh, UK.

Nick Ashton,Martin Bates,Simon G Lewis,Peter Hoare,Richard Bates,Simon A Parfitt,Isabelle De Groote,Craig Williams,Sarah M Duffy,Sylvia Peglar,Chris Stringer,Mark Lewis,Michael D Petraglia

doi:10.1371/journal.pone.0088329

Abstract

Investigations at Happisburgh, UK, have revealed the oldest known hominin footprint surface outside Africa at between ca. 1 million and 0.78 million years ago. The site has long been recognised for the preservation of sediments containing Early Pleistocene fauna and flora, but since 2005 has also yielded humanly made flint artefacts, extending the record of human occupation of northern Europe by at least 350,000 years. The sediments consist of sands, gravels and laminated silts laid down by a large river within the upper reaches of its estuary. In May 2013 extensive areas of the laminated sediments were exposed on the foreshore. On the surface of one of the laminated silt horizons a series of hollows was revealed in an area of ca. 12 m2. The surface was recorded using multi-image photogrammetry which showed that the hollows are distinctly elongated and the majority fall within the range of juvenile to adult hominin foot sizes. In many cases the arch and front/back of the foot can be identified and in one case the impression of toes can be seen. Using foot length to stature ratios, the hominins are estimated to have been between ca. 0.93 and 1.73 m in height, suggestive of a group of mixed ages. The orientation of the prints indicates movement in a southerly direction on mud-flats along the river edge. Early Pleistocene human fossils are extremely rare in Europe, with no evidence from the UK. The only known species in western Europe of a similar age is Homo antecessor, whose fossil remains have been found at Atapuerca, Spain. The foot sizes and estimated stature of the hominins from Happisburgh fall within the range derived from the fossil evidence of Homo antecessor.

Highlights

The survival of early hominin footprints is extremely rare, but can provide critical information about bipedalism, posture, gait and the size of the hominins involved, often in the absence of skeletal evidence [1,2,3,4,5,6,7,8] (Figure 1)
The earliest hominin footprints are preserved in volcanic ash at Laetoli in Tanzania
These provide evidence of bipedalism in Australopithecus afarensis dating to ca. 3.66 million years ago (My) [1], [11,12,13]

Summary

Introduction

The survival of early hominin footprints is extremely rare, but can provide critical information about bipedalism, posture, gait and the size of the hominins involved, often in the absence of skeletal evidence [1,2,3,4,5,6,7,8] (Figure 1). The earliest hominin footprints are preserved in volcanic ash at Laetoli in Tanzania. These provide evidence of bipedalism in Australopithecus afarensis dating to ca. Footprints from six individuals have been discovered 70 km to the north at Ileret [7], [14]. The footprints are larger than those at Laetoli, and suggest that by 1.5 My humans had developed an essentially modern walking gait and are argued to have reached a similar stature to modern humans [15]

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Results

Discussion

Conclusion