News: Q&A 
Notes from an excavation 
Russell L. Ciochon and his team are in Indonesia investigating the 
geological source and age of one of the world's biggest caches of Homo 
erectus. 
Miriam Frankel 
Russell L. CiochonRussell L. Ciochon, who heads the team at the 
Ngandong site, with a gorilla skull.Tom Jorgensen 
In the early 1930s, 14 Homo erectus fossils and 25,000 vertebrate 
remains were unearthed near the muddy Solo River at Ngandong in Java, 
Indonesia, by a research team from the Netherlands. Some 80 years 
later, this remains one of the world's largest caches of this early 
human. It could also be evidence of the species' swansong. A team has 
now returned to Ngandong, armed with the original Dutch survey 
documents, to answer some long-standing questions about the age of the 
fossils and the ancient sediment that they were buried in. Nature 
talked to Russell L. Ciochon, a palaeoanthropologist at the University 
of Iowa in Iowa City, while his team was digging at Ngandong. 
Why is this fieldwork so important? 
H. erectus from Ngandong potentially lived in the last part of the Ice 
Age at the same time that Homo sapiens inhabited other parts of the 
Old World, and Homo floresiensis (the 'hobbit') was still living in 
caves on the Indonesian island of Flores. This was a very intriguing 
period in the saga of human evolution. 
According to the Dutch team who discovered them, the H. erectus 
specimens were deposited by the Solo River. The fact that the present 
river is so near to the deposits that contained the H. erectus 
specimens could indicate that the deposits and fossils are far younger 
than the oldest known H. sapiens in Africa, which would mean that the 
two species actually coexisted. But attempts to date Ngandong over the 
past 30 years have proved inconclusive. This is partly because we 
don't know enough about the Ngandong geology and can't be sure that 
the dated samples from earlier excavations came from the discovery 
bed. Our team is the first to focus on the geological context of the 
fossils1. This was possible because geoarchaeologist Frank Huffman 
from the University of Texas at Austin obtained the long-forgotten 
survey documents from the 1930s2. 
Ngandong siteIndonesian team leader Yahdi Zaim (left) and Rob Scott 
excavate the bone bed.O. Frank Huffman 
What have you found at the site? 
During our expedition, we have recovered more than 800 fossils from a 
bone bed — a geological deposit with a dense collection of bones. The 
excavations have provided our geological team, which includes 
University of Iowa geoarchaeologist Art Bettis, with details on the 
site's sediments that shed new light on how the bone bed was created. 
We believe that the detailed analysis of the site's geology and the 
circumstances of burial of the bone bed will provide the crucial 
information to evaluate the dating and other contentious issues 
surrounding the remains. 
We found no stone artefacts at the site, but these are rare at most 
Javan H. erectus sites. It is one of the unique features of the Java 
record that remains to be explained. 
What can the fossils tell us about the daily lives of these late 
members of H. erectus? 
Although we don't have direct evidence, we believe that H. erectus 
exploited the resources in the area, probably by hunting or 
scavenging. Other clues about their lives can be found by looking at 
the non-human fossils, and what they can tell us about the ecology at 
the time. A member of our team, Robert Scott of Rutgers University in 
New Jersey, specializes in such fossils and found that they are mostly 
made up of large bovids — ancestors of the Javan banteng and water 
buffalo — as well as deer, Stegodon (an extinct elephant), rhinoceros, 
panther, crocodiles and turtles. The large percentage of bovids and 
deer could indicate that H. erectus lived in an open woodland or 
grassland environment. 
Also, on the basis of estimates from partial skeletons of H. erectus 
from other sites, we think that the Ngandong H. erectus was probably 
between 1.66 and 1.85 metres tall — similar to the average human 
height in the United States today. 
Solo RiverThe Solo River, which runs near the Homo erectus site.O. 
Frank Huffman 
What can the Ngandong excavation site tell us about the evolution and 
extinction of H. erectus? 
The 14 H. erectus fossils are thought to represent a late stage in the 
evolution of the species. As a group, they have a significantly larger 
average brain size than that found in any other H. erectus fossils. 
Palaeoanthropologists don't like to use terms such as 'advanced' to 
distinguish one fossil group from another, but that term would 
certainly apply to the Ngandong fossils. After arriving on Java about 
1.6 million years ago3, H. erectus apparently lived in 'splendid 
isolation' without competition from any other human species. 
It is possible that when H. sapiens eventually reached Java, it could 
have competed with H. erectus for scarce island resources, leading to 
the extinction of the latter. But it is more likely that some unique 
geological or climatic event resulted in the extinction of Javan H. 
erectus, as is the case with most species. However, it does seem that 
the Ngandong group is the best evidence we have for the last 
occurrence of this species worldwide. 
What has been the most exciting moment of the expedition so far? 
The first high point came after several excavation pits were opened. 
We found boundaries of the original excavations not seen since the 
1930s. This revealed untouched bone beds fitting the parameters 
originally described by the Dutch team. We are reliving the days of 
the discovery made nearly 80 years ago, and meeting present-day 
research objectives as we unearth the past. 
What is a typical day at the site like? 
We've been excavating for 24 days without a break. The days blur 
together and we often lose track of time. There is a routine to 
systematic palaeoanthropological excavation: opening an excavation 
pit, digging down to the bone bed, carefully mapping the strata as we 
proceed, exposing the fossils, assigning the fossil a number, charting 
its xyz coordinates, removing the fossil, and then sampling the strata 
for geological analysis and dating. 
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How does the Javan H. erectus compare with those from other sites in 
the world and where did it actually come from? 
We spend a lot of time discussing this question. The earliest H. 
erectus fossils date to about 1.8 million years ago — appearing nearly 
simultaneously in both East Africa and at Dmanisi in the Republic of 
Georgia. So H. erectus from Africa and Georgia represent critical 
comparisons for any Javan H. erectus. It is thought that the species 
evolved in Africa and spread out of the continent to the Republic of 
Georgia and to Java over a very short timespan — perhaps less than 
100,000 years. However, the most primitive and smallest H. erectus 
fossils come from Dmanisi. Anatomically, Dmanisi H. erectus shares 
features with both the African and Javan H. erectus, so it may 
actually be the centre of origin for the species. If you compare 
Ngandong H. erectus with those from elsewhere, it is clear that the 
most derived population is from Ngandong. 
sourcehttp://news-releases.uiowa.edu/2010/july/072810ciochon.html 
University of Iowa News Release 
July 28, 2010 
Photo: Russ Ciochon (left), Frank Huffman, Yahdi Zaim and Art Bettis 
stand in an excavation pit at Ngandong. Photo Credit: Maija E. Sipola. 
UI anthropologist describes early human dig site in Nature News story 
A University of Iowa anthropologist and his colleagues are featured in 
the July 28 online edition of Nature News discussing their latest dig 
to determine the geological source and precise age of the remains of 
Homo erectus on the island of Java. Homo erectus is a distinct species 
of early man that lived in Java between about 1.6 million and 50,000 
years ago, or perhaps more recently. 
Nature News is a publication of the journal Nature. A Q&A about the 
dig can be found at http://www.nature.com/news/2010/100728/full/news.2010.377.html. 
Russell L. Ciochon (sha-HAN), professor of the Department of 
Anthropology in the University of Iowa College of Liberal Arts and 
Sciences, led the large-scale excavation for Homo erectus remains at 
Ngandong, Java, for 24 days during July. The interdisciplinary U.S. 
team included UI associate professor of geoscience Arthur Bettis, UI 
anthropology graduate student Shelby Putt of Fort Wayne, Ind., UI 
geoscience graduate student Maija Sipola of Babbitt, Minn., and 
research faculty from the University of Texas and Rutgers University. 
What they found at the site is expected to advance scientists' 
understanding of the evolution and adaptations of early Asian humans. 
Ciochon said the team recovered more than 800 fossils from a bone bed 
and the excavations revealed details on sediments at the site telling 
how the bone bed was created. 
"The site's geology and the circumstances of burial of the bone bed 
will provide crucial information to evaluate the dating and other 
contentious issues surrounding the Ngandong human remains," he said. 
Living approximately 50,000 years ago during the last portion of the 
Ice Age, Homo erectus fossils at Ngandong represent a surviving relic 
population on the island of Java. Other early humans in Asia that date 
to this same time range are our own species, Homo sapiens (China and 
Australia), and the 'hobbit' (Homo floresiensis), an island dwarf 
survivor on the isolated island of Flores, east of Java. 
The excavation site itself dates to the 1930s, when Homo erectus 
fossils and 25,000 vertebrate remains were first found at Ngandong 
along the shores of the Solo River in Java. Although it is one of the 
largest sites of Homo erectus bones, the exact age of the fossils 
remains in doubt, with the result that the fossils may or may not be 
evidence of one of the last occurrences of the species. 
Ciochon's team returned to the site some 80 years later, along with 
the original Dutch survey documents to attempt to answer some of the 
questions about the age of the fossils and their geological source. 
Ciochon said that it was exciting to relive history by opening the 
excavation pits and observing the boundaries of the original 
excavations and the untouched bone beds -- sites not seen since the 
1930s. 
The dig was funded by a $35,000 grant from the Wenner-Gren Foundation 
for Anthropological Research, New York.

Russell L. Ciochon and his team are in Indonesia investigating the geological source and age of one of the world's biggest caches of Homo erectus.