Daily Bulletin


The Conversation

  • Written by Mike W Morley, Senior research fellow, Flinders University

Denisova Cave in Siberia’s Altai Mountains is one of the world’s most important archaeological sites. It is famous for preserving evidence of three early human groups: Neanderthals, early Homo sapiens, and a third group known as the Denisovans.

Fossil bones, stone tools and ancient DNA gathered from the cave have told a story that is extremely significant for understanding the early chapters of human evolution in Asia, going back 300,000 years.

But our new analysis of the cave’s dirt floor reveals that it was also frequented by hyenas, wolves, and even bears for much of its history.

Read more: Fresh clues to the life and times of the Denisovans, a little-known ancient group of humans

Our research, carried out with Russian colleagues and published today in Scientific Reports, takes the story of the cave’s occupation down to the microscopic level – examining the dirt from the cave to piece together new evidence that is invisible to the naked eye.

We found that the sediments contain abundant fossil droppings, but surprisingly scant evidence of human activity such as fires.

sediments reveal a famous early human cave site was also home to hyenas and wolves The foothills of the Altai Mountains in the area of Denisova Cave.

Digging deeper

The Denisova Cave fossils have already told us some remarkable tales about the cave’s past, and the now-extinct cousins of our own species that sought shelter there. DNA analysis of one bone fragment showed that it belonged to the teenage daughter of a Neanderthal mother and a Denisovan father.

Read more: Ancient teenager the first known person with parents of two different species

But by looking more closely at the very fabric of the cave, we can learn even more. Dirt – or sediment, to archaeologists – is the material that links all archaeological sites. And it can preserve evidence that would otherwise have little chance of surviving the ravages of time.

sediments reveal a famous early human cave site was also home to hyenas and wolves Block of sediment (dirt) extracted from the site for laboratory analysis.

By using a technique called micromorphology to study archaeological deposits at microscopic scales, we can spot particular features and arrangements of sediment particles that reveal clues about what was happening at the time those sediments were deposited.

This method can potentially identify miniscule traces of detritus left behind by humans living in the cave. These can include the products of burning, such as ash and charcoal, which indicate that humans lit fires there.

Caves are also attractive shelters for other animals, and fossil droppings can indicate the presence of both human and non-human cave dwellers.

Carnivores’ cave

The sediment in Denisova Cave contains evidence for its long-term use by humans and other animals, including hyenas, bears and wolves, that inhabited the wider landscape. We indeed found microscopic traces of both human and animal occupation, judging by the dropping fragments we identified.

But curiously, despite the cave having been occupied by humans for hundreds of thousands of years, as evidenced by the many fossils and stone tools already found there, its sediments contain scant evidence for the use of fire.

sediments reveal a famous early human cave site was also home to hyenas and wolves Microscope images of fossil hyena dropping (coprolite) with evidence of a meal (bone fragment) contained inside (left), and small charcoal fragments associated with burning by ancient human cave-dwellers (right)

This is intriguing, as archaeological evidence for fire-use in caves is usually commonplace, even if the sediments have been disturbed by processes such as animal burrowing, erosion by wind or water, or chemical changes to the sediment.

One possibility is that these traces were washed away by percolating water or weathered away by increased acidity.

But what the sediments do clearly tell us is that large carnivores were common visitors to the cave. As humans and large carnivores would not have happily cohabited the cave, this tells us that what we see in the sediments is a compression in time, with animal and human evidence overlain on top of one another.

Read more: Southeast Asia was crowded with archaic human groups long before we turned up

We also recorded the presence of ice in some of the sediments, indicating periods when it was both colder and wetter than at present.

Our findings show just how much we can learn by putting dirt under the microscope. It is likely this “microarchaeological” approach will continue to surprise us with finds that are invisible to the naked eye.

Authors: Mike W Morley, Senior research fellow, Flinders University

Read more http://theconversation.com/dishing-the-dirt-sediments-reveal-a-famous-early-human-cave-site-was-also-home-to-hyenas-and-wolves-122458

Writers Wanted

An unexpected consequence of climate change: heatwaves kill plant pests and save our favourite giant trees

arrow_forward

Burnt ancient nutshells reveal the story of climate change at Kakadu — now drier than ever before

arrow_forward

My favourite detective: Jules Maigret, the Paris detective with a pipe but no pretense

arrow_forward

The Conversation
INTERWEBS DIGITAL AGENCY

Politics

Ray Hadley's interview with Scott Morrison

RAY HADLEY: Prime Minister, good morning.    PRIME MINISTER: G’day Ray.   HADLEY: I was just referring to this story from the Courier Mail, which you’ve probably caught up with today about t...

Ray Hadley & Scott Morrison - avatar Ray Hadley & Scott Morrison

Prime Minister's Remarks to Joint Party Room

PRIME MINISTER: Well, it is great to be back in the party room, the joint party room. It’s great to have everybody back here. It’s great to officially welcome Garth who joins us. Welcome, Garth...

Scott Morrison - avatar Scott Morrison

Prime Minister Interview with Ben Fordham, 2GB

BEN FORDHAM: Scott Morrison, good morning to you.    PRIME MINISTER: Good morning, Ben. How are you?    FORDHAM: Good. How many days have you got to go?   PRIME MINISTER: I've got another we...

Scott Morrison - avatar Scott Morrison

Business News

Tips to find the best plastic manufacturing supplier for your needs

Plastics are very much an important part of all of our lives, but they’re particularly valuable to a wide variety of industries that rely on their production for their operations. The industries, ...

News Co - avatar News Co

7 foolproof tips for bidding successfully at a property auction

Auctions can be beneficial for prospective buyers, as they are transparent and fair. If you reach the limit you are willing to pay, you can simply walk away. Another benefit of an auction is tha...

Dominique Grubisa - avatar Dominique Grubisa

Getting Ready to Code? These Popular and Easy Programming Languages Can Get You Started

According to HOLP (History Encyclopedia of Programing Languages), there are more than 8,000 programming languages, some dating as far back as the 18th century. Although there might be as many pr...

News Co - avatar News Co



News Co Media Group

Content & Technology Connecting Global Audiences

More Information - Less Opinion