john hawks weblog

paleoanthropology, genetics and evolution

site conservation

  • Repatriation in Torres Strait

    Wed, 2011-03-09 20:29 -- John Hawks

    The Guardian:

    Natural History Museum returns bones of 138 Torres Strait Islanders

    Tears of joy as human remains are repatriated to natives of islands located between Australia and Papua New Guinea

    Most, ranging from a jaw to full skeletons, have been in England since the mid 19th century. Some came back as sailors' souvenirs, some were collected by the surgeon of the British survey ship Rattlesnake, some were bought or traded among the first European visitors.

    According to the story, the bones are not to be reburied, at least not immediately, and may be studied by researchers in conjunction with Torres Strait Island natives.

  • A Sterkfontein visit

    Sat, 2010-01-16 23:20 -- John Hawks

    After this week's description of the new public accessibility of the Dmanisi site, a reader sends a link to a tour of Sterkfontein by The Guardian's David Smith:

    Wandering through the cool, dark caves, I looked up at a gate behind which the excavation of Little Foot continued. Around me were the jagged walls and roof, soaring majestically above our heads like nature's cathedral. The rocks had been worn into random shapes by the millennia. One, said the guide, shining a torch, looked like the trunk and ears of an elephant.

    The Cradle of Humankind is one of the most accessible archaeological sites in the world

  • Permit problems circa 1928

    Wed, 2009-08-26 08:30 -- John Hawks

    While reading the history of paleontological excavations in the Fayum, I found many articles dealing with the area's classical archaeology. One article, by Gertrude Caton-Thompson (1928) gave an interesting account of conflicts between field excavations and permit-seeking from government officials. Since this has been a recurrent problem over the years, I thought it would be worth giving a couple of quotes:

    Tranquil in the tradition which forbids appropriation of another person's work without inquiry as to their intentions to continue it, I found to my dismay, when applying in the spring of 1927 for renewal of concession, that, owing to alleged sensational discoveries (a great prehistoric cemetery; shelter with breccia, ranging from Acheulean to Campigny; rows of dolmens; pile-dwellings, etc.) by Count de Prorok, working unauthorised in our vacated area from the University of Michigan Expedition's base, an American expedition had secretly applied for, and been virtually accorded the N. Fayum concession. Prolonged negotiations with the Dept. of Antiquities, so devoid of prehistorians as to be unable to verify the authenticity of the Fayum discoveries, resulted in acknowledgment of our moral right to continue the work in which we had led the way, but left undefined the area to be assigned to us. The positions of the sites coveted by the Oriental Institute of Chicago were widespread: no attempt was made from that quarter to alleviate our position; and on arrival in Egypt in November we found ourselves re-allotted a restricted concession within the area we had already exhausted both prehistorically and geologically, sandwiched in between Chicago's western concession near Qasr - el - Sagha, containing the "Paleolithic cave," and their eastern one near Kom Ashim, containing the "prehistoric cemetery " and " dolmens." The black-line square on our map (Fig. 1) shows the area held the first two seasons; the intermittent line halving it the one allotted to us last season. In view of the grave inadequacy of this concession, I applied at once for a second one, covering the very difficult ground at the west-end of the lake: this was granted in. January.

    Caton-Thompson had quite a storied career; after these archaeological surveys of the Fayum, she excavated Great Zimbabwe and mentored Mary Leakey. As for her permit troubles, the end result of being forced to visit the same site for several seasons in a row was a set of discoveries that an archaeologist today would be pretty thrilled to find:

    In the meanwhile we settled down on our old northern ground to wring such her drops of evidence from it as ironic gods might help us to obtain. They sent torrential rains. The discovery of the Ptolemaic irrigation system resulted, due to growth of vegetation upon the buried, sand-filled channels (P1. G., Fig. 1). Much as the growth of weeds helped us to trace their course, anything approaching a complete map of the system was possible only by prolonged investigations, making calls upon the detailed knowledge of levels collected in previous seasons.

    ...

    The other unexpected find of the season was that of extensive Old Kingdom gypsum works in the northern hills bounding our concession. A splendid outcrop of pure gypsum in massive formation, nearly a mile long, a quarter broad, and about 15 feet thick, had been extensively used in the IIIrd and possibly early IVth Dynasties (2900 B.C. circa), mainly, it would seem, to obtain material for the plaster and mortar required in the construction of the earlier Pyramids and Pyramid cemeteries, less than 30 miles distant by desert route....Over 3,000 defective vases, discarded before completion, were counted in, or on, the workshop mounds, hinting at the great numbers which were exported.

    So working the same field site for several seasons seems like a rational thing for the government to have wanted!

    Although in this case it was probably unanticipated returns. In any event, the kinds of discoveries that would drive a long career today were small potatoes for 1920's archaeology. On to bigger and better things!

    References:

    Caton-Thompson G. 1928. Recent excavations in the Fayum. Man 28:109-113.

  • The fingerprints of fossilization

    Mon, 2009-08-03 15:06 -- John Hawks

    It's a sign of the success of "DNA fingerprinting" that any kind of identification technique is immediatly cast in those terms ("DNA-like technique may help nab fossil thieves"). But the method described in the linked AP story is actually a lot more like the "fluorine dating" method that exposed the Piltdown hoax.

    Researchers are testing methods designed to match chemical signatures of naturally occurring elements that seep into bones during fossilization with surrounding soil.

    The process — which analyzes a group known as rare earth elements — could someday lead to a database of site "fingerprints" used to link bones to looted areas. More work is needed, but early signs are encouraging that the technique could be useful in nabbing those capitalizing on looted fossils, said Dennis Terry, a researcher at Temple University in Philadelphia.

    The point is, the absorption or incorporation of elements in fossils at a site are relative to depositional history and local concentrations. With Piltdown, the human skull and orangutan jaw hadn't been in the site as long as the fauna, which was made plain by the lack of consistency of fluorine concentrations. But it is easier to show gross inconsistency than to prove identity. Even two fossils from the same level at the same cave may have rather different fluorine concentrations, because different parts of a site may relate differently to groundwater fluctuations.

    Looking at several rare earth elements may increase the information content greatly, allowing finer resolution, but in the end it is still the problem of establishing confidence. Similar methods help to show that rocks originate with a single volcanic eruption, so it seems plausible that one could do the same for fossils. But it will take a big database to generate sound statistics.

  • Quote: Cuvier on fossil destruction

    Tue, 2009-07-28 23:03 -- John Hawks

    Georges Cuvier is generally remembered for the idea of "catastrophism" -- but I ran across this quote (in translation) from his description of the famous opossum fossil, which shows he was interested in a different kind of destruction as well:

    It is without doubt a really admirable thing, this rich collection of debris and animal skeletons of an ancient world, assembled by nature in the quarries that surround our city, as if preserved by her for the study and instruction of the present age. Every day some new remains are discovered there; every day adds to our surprise by proving more and more that none of what then peopled the earth in this part of the globe has been preserved on our present soil; and these proofs will doubtless be multiplied to the extent that more interest is shown in them and more attention given to them. In certain beds there is scarcely a block of gypsum that does not conceal some bones: how many millions of these bones have already been destroyed, since the quarries began to be exploited and the gypsum used for building! How many are being destroyed even now by simple negligence, and how many by their small size still escape the eye of even the laborers who are most attentive to collect them!

    This translation appears on page 69 of Martin Rudwick's 1998 book, Georges Cuvier, Fossil Bones, and Geological Catastrophes: New Translations and Interpretations of the Primary Texts.

    UPDATE (2009-07-29): No, Cuvier was not claiming to be the "stud" of the "present age" -- that was my typo. Still, there is this:

  • Paying the price for rare fossils

    Wed, 2009-07-22 13:05 -- John Hawks

    Primate paleontologist Elwyn Simons and (many) colleagues cosigned a letter in the current Nature protesting the high price paid for the "Ida" fossil, Darwinius masillae ("Outrage at high price paid for a fossil"). Reportedly, the "A" side of the fossil was sold for around $750,000, which Simons and colleagues suggest "amplified" the "publicity barrage surrounding this fossil." The letter is worth reading in its entirety, but many of my readers do not have access to the journal so I will reproduce the final paragraph:

    In our view, such objectionable pricing and publicity can only increase the difficulty of scientific collecting by encouraging the commercial exploitation of sites and the disappearance of fossils into private collections. We believe that payments on this scale are detrimental to scientific investigation, and respectable institutions should not be responsible for making or publicizing them. We strongly believe that fossils should not have any commercial value.

    I hope the letter can spur some constructive discussion. Not every fossil is rare -- but even common ones have scientific value, as we can understand the dynamics of ancient populations only by examining large samples of individuals with known provenience. Nowadays, it has become more and more possible to study ancient communities of organisms, not merely single species. Even at a site like Messel, with large numbers of specimens, there will be rare taxa represented by only one or two specimens. Rare things are inevitable, and the question is how to fairly allocate access to them by both researchers and the public.

    References:

    Simons EL, Ankel-Simons F, Chatrath PS, Kay RS, Williams B, Fleagle JG, Gebo DL, Beard CK, Dawson M, Tattersall I, Rose KD. 2009. Outrage at high price paid for a fossil. Nature 460:456 doi:10.1038/460456a

  • Zhoukoudian cave site in danger of collapse

    Tue, 2009-06-30 17:05 -- John Hawks

    From China Daily:

    Reinforcement has begun at the Peking Man site to prevent one of its walls from collapsing.

    The protective excavation, which started Wednesday, focuses on the west section of the cave where the first Peking Man skull, hundreds of thousands of years old, was found in Zhoukoudian, 46 kms from downtown Beijing.

    The west section is the only part that has remained untouched since the cave's discovery.

    "Repair work cannot be done without a comprehensive excavation," Gao Xing, deputy director and research fellow of the Institute of Vertebrate Paleontology and Palaeoanthropology of the Chinese Academy of Sciences, said at a press conference Wednesday.

    Xinhua news agency has a short history of excavations at the site, although it omits Weidenreich's role entirely, and misses the details of the 1960's excavations beyond a mention.

  • Lascaux update

    Sun, 2009-05-24 09:13 -- John Hawks

    According to New Scientist, human activity and prior attempts to kill the fungus have made the ecology of Lascaux similar to a hospital cooling tower.

    The team conclude that a benzalkonium chloride spray applied between 2001 and 2004 to kill the fungus is to blame, as it allowed bacteria brought in by human visitors to thrive (Naturwissenschaften, DOI: 10.1007/s00114-009-0540-y). "It produced a drastic change in the cave biodiversity," says [Cesareo[ Saiz-Jimenez.

    The report mentions that the cave ecology now includes pathogens linked to disease outbreaks in humans. That seems like a good reason to stay out. Maybe too good. Like that part of Close Encounters where the army scatters dead cattle all over Wyoming.

  • Burrup rock art to be relocated

    Wed, 2008-12-24 08:30 -- John Hawks

    Paul Ham reports on developments which may force the relocation of rock art in northwestern Australia:

    The world’s oldest depiction of a human face could be threatened if Australian mining companies are permitted to build an explosives factory on the remote Burrup peninsula in the northwest of the country.

    A bulbous image of indiscernible sex, with huge eyes and sunken cheeks, the 10,000 year-old carving is chipped out of hard rock. Thousands of other carvings, mostly of plants and animals, which date back to beyond the last Ice Age, are scattered about the peninsula.

    Archeologists believe that aboriginal tribes made the distinctive carvings up to 30,000 years ago. They could be nearly twice as old as the Lascaux cave paintings in the Dordogne, France.

    The West Australian paper has this report on a December 20 rally:

    A rally in Perth today marked the 200th global 'stand up' for Burrup Peninsula with a renewed call for World Heritage listing for the rock art site.

    Since 2006, Friends of Australian Rock Art has organised 200 vigils for the Burrup rock art in more than 35 countries and in every continent except Antarctica.

    FARA spokesperson Robin Chapple said that international pressure was mounting for Australia to include the Burrup on the UNESCO World Heritage List.

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Neandertals

For years, I've worked on their bones. Now I'm working on their genes. Read more about the science studying these ancient people.

Denisova

From a finger bone of an ancient human came the record of a completely unexpected population. My lab is working on the science of the Denisova genome.

Acceleration

The advent of agriculture caused natural selection to speed up greatly in humans. We're uncovering some of the ways that populations have rapidly changed during the last 10,000 years.

Malapa

Just outside Johannesburg, the Malapa site is producing some of the most exciting finds in human evolution. This site is the headquarters of the Malapa Soft Tissue Project.