Happisburgh footprints: The 800,000-year-old discovery through the eyes of the person that found them

Happisburgh footprints. Photograph by Martin Bates (Image: Archant)

Happisburgh has hit the news again. Last time the coverage even reached the People's Daily in China, but I've yet to find out which parts of the globe the latest story has reached.

Happisburgh footprints. Photograph by Martin Bates (Image: Archant)

Whereas three years ago the news was the oldest human site in northern Europe at over 800,000 years ago, now we have the oldest footprints outside Africa. Happisburgh just keeps giving up surprises.

Happisburgh as it might have looked 900,000 years ago (Image: Archant)

We found them by pure chance in May last year.

We were about to start a geophysics survey on the foreshore, when an old-time friend and colleague, Martin Bates from Trinity St David's University, pointed out the unusual surface. The site lies beneath the beach sand in sediments that actually underlie the cliffs.

The cliffs are made up of soft sands and clays, which have been eroding at an alarming rate over the last ten years, and even more so during the latest winter storms.

As the cliffs erode they reveal these even earlier sediments at their base, which are there for a short time before the sea washes them away.

Video and new images: Earlist evidence of human footprints outside Africa are discovered in Happisburgh, north Norfolk.

Back in May, high seas had removed most of the beach sand to reveal ancient estuary mud. We'd seen these many times before and had been digging them for years. Normally they consist of flat laminated silts, but in a small area of about 12 square metres there was a jumble of elongated hollows.

Martin pointed them out and said that they looked like footprints. He'd been studying similar prints on the Welsh coast near Aberystwyth, but they were just a few thousand years old; we knew the sediments at Happisburgh were over 800,000 years old.

I imagine that there will be plenty of sceptics out there, as were we initially, but the more we eliminated the other possibilities, the more convinced we became. The sediments are hard and compacted – you can jump on them today and leave little impression. And there are no erosional processes that leave those sort of hollows.

The moment of truth came after we'd recorded them.

We returned a few days later with Sarah Duffy from York University to photograph them using photogrammetry, a technique that uses multiple digital photographs and stitches them together with some clever software.

The method is great, but the weather wasn't – lashing rain, an incoming tide and fast-fading light. By the end we were cold, soaked, demoralised and still not necessarily convinced.

The results though were amazing.

For the first time we had proper overhead images and could identify heels, arches and in one case toes. Isabelle de Groote from Liverpool John Moores University did much of the analysis. It seems that there were perhaps five individuals, both adults and children. The tallest was probably about 5 foot 9 inches tall.

So who were they?

Although we have no human bones, the most likely species was Homo antecessor or 'Pioneer Man', who lived in southern Europe at this time. They were smaller-brained than ourselves, but walked upright and fully bipedal.

We actually know very little else about the people who left these prints, but from the plant and animal remains at Happisburgh we know that they were able to survive winters colder than today.

We're still asking questions of whether they had clothing and shelter or controlled the use of fire.

Some of this evidence will be on display in a major exhibition, Britain: One Million Years of the Human Story opening at the Natural History Museum on Thursday 13 February 2014.