Tag Archives: palaeoenvironment

Big Bucks for Early Coast at OSU

Posted on October 29, 2010 | 4 comments

Screenshot of PSAL Web Page.

It looks like big Northwest Coast projects on old sites are in the works at Oregon State University.  I came across a new blog which is the public face of something called the Pacific Slope Archaeological Lab with the mission of “Discovery, recovery, and interpretation of First Americans archaeology in the New World’s Far West.”  The blog points to a large number of projects which have been initiated or are planned under this research umbrella.  How is such a wide-ranging and ambitious research project possible?  A million dollar endowment making a fund under the direction of OSU Associate Professor Loren Davis isn’t hurting.

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Posted in Archaeology, Northwest Coast, Oregon

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Long term salmon resilience

Posted on September 25, 2010 | 4 comments

Salmon lice infestation. Source: Georgia Strait Alliance.

I’ve just dipped into an interesting paper (PDF) by Sarah Campbell and Virginia Butler, which explores 7,500 years of relationship between First Nations and Pacific Salmon.  While, as ever, the archaeological evidence is discontinuous and somewhat patchy, the authors reach profound conclusions that go far beyond the usual archaeological focus on the past, as if the past still exists other than in the present.

The Northwest Coast was estimated to have the second highest indigenous population density in North America (after California) at European contact, with population estimates ranging from 102,100 to 210,100 (Ubelaker 2006). Haggan et al. (2006) propose an annual average per person consumption rate of 230 kg/yr based on two 19th- century estimates. At this rate, 200,000 people would annually consume 46,000 metric tons (50,706 tons) of salmon, comparable in magnitude to the average yearly commercial catch between 1901 and 2000 (Jones 2002). (emphasis added)

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Posted in anthropology, Archaeology, Northwest Coast, palaeontology, Uncategorized

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Still no Clovis Comet

Posted on September 21, 2010 | 21 comments

Oh noes, my tusks are on fire. Source: wincustomize.com

I talked once before about the “Clovis Comet” theory, which suggested the widespread extinctions of megafauna in North America at the end of the last ice age was caused by a large comet impact.  At the same moment, the highly distinctive “Clovis” archaeological culture was terminated.  It was suggested this comet might have either airburst or struck the ice sheets, in either case not causing a visible crater.  However, abundant “nanodiamonds”, said to be highly diagnostic of an extraterrestrial impact, were found at a widespread boundary layer roughly associated with the end of Clovis – the start of the Younger Dryas cold period when the earth was suddenly thrust back into near-glacial conditions.

So, I said then and I’ll say again now: this theory didn’t pass the sniff test from the beginning because it is another example of “Clovis exceptionalism” – the skeptical leeway that the Clovis-First model of first peopling of the Americas has been afforded by segments of the archaeological community.  No Clovis model was so implausible that it wasn’t given much respectful beard-stroking by the usual silverbacks.

Anyway, subsequent studies of the nanodiamonds and associated evidence have failed utterly to reproduce the findings.  Now comes even more news that the comet theory is unsupported and that the original investigators may have mistaken nanodiamonds for, among other things . . .  [drumroll] . . .  “hardened faecal material from arthropods.”

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Posted in Archaeology, palaeontology

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Society of Ethnobiology Conference: Coming to Victoria

Posted on December 13, 2009 | 1 comment

Top notches in a standing western red cedar tree, the result of extracting one or more planks.

Dana sent me a note that the 33rd annual meeting of the Society of Ethnobiology “The Meeting Place: Integrating Ethnobiological Knowledge”, will be held 5–8 May, 2010, in Victoria.I believe some “rockwashy” types are helping out with the organization.  It sounds like a great conference and a chance to build networks between plant people and rock people and bone people – and we sure do need a lot more archaeology of plants out here on the NW Coast, where bones and stones still rule the day.

This year’s conference theme celebrates the potential of ethnobiology to bridge disciplines, ideas, and communities, and to foster an understanding of the connections between the biological and cultural worlds.

In addition to our usual dazzling line up of papers and sessions, here’s a preview of some of the other special events:

  • Wednesday night welcome reception in the First Nations gallery at the Royal British Columbia Museum
  • Special discussion sessions on: Teaching science through ethnobiology, Ethnobiology and ethics, Communicating environmental knowledge through media, Indigenous people’s food systems, and more!
  • Thursday night poster reception at the just opened First People’s House at the University of Victoria
  • Six! fabulous field trip options
  • A banquet of traditional B.C. First Nation’s food followed by a presentation of the Atla’kima “Spirits of the Forest” dance by Kwakwaka’wakw Longhouse dancers

This year’s meetings will be back-to-back with the International Society of Ethnobiology congress in nearby Tofino, B.C., May 9–14.

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Posted in anthropology, First Nations, Miscellaneous, Teaching

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Raven-Walking & Geological Transformation

Posted on December 10, 2009 | 2 comments

Haida History starts at least 14,500 years ago. (Image credit: Daryl Fedje).

Three things we know about Haida Gwaii:

1.  About 14,500 calendar years ago it was a temperate tundra environment, with no trees.  The first trees, pine, appear about 14,000 years ago and there is progressive forest infilling thereafter, with the modern species mixture in place by about 3,000 years ago.

2. It has an impoverished suite of large land mammals – historically, these were limited to black bear, caribou, marten, ermine, a vole and a shrew.  We know that 13,000 years ago there were also deer and brown bear on the islands, and quite likely other species as well.

3.  It used to be much larger than in the present.  With lower sea levels at the end of the last ice age, Hecate Strait was largely dry land, exposing a large, unglaciated, coastal plain that became rapidly flooded.

It seems to me that we can add a fourth thing we know:

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Posted in anthropology, Archaeology, First Nations, Haida Gwaii, history, Northwest Coast, palaeontology

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Seward Peninsula Mastodon Tusk – “too old”, therefore Too Old.

Posted on November 29, 2009 | 3 comments

Worked 35,000 year old mammoth tusk from Alaska. Note scale! Source: Gelvin-Reymuller et al.

This is getting a little out of the area, but I’ve just run across a report by Gelvin-Reymuller et al.  (download PDF) on the finding of a worked mammoth tusk from the north side of the Seward Peninsula.  That is on the west-central Alaska coast near the closest approach to Asia, and hence smack in the middle of Beringia.  The tusk is interesting in its own right, of course, but doubly so when we see that it was dated to well before the last glacial maximum:

Though the age of the tusk is only peripherally relevant to the significance of the reduction described in this paper, the tusk was sampled for dating. A single bone collagen sample from the tusk was dated by Beta Analytic, Inc. following standard pretreatment and analytical procedures. A 5.2 g of sample was first removed from an inner area, well beneath a surficial treatment of Elmer’s Glue-All which the tusk’s discoverer had initially applied to the surface. The resultant AMS date was 35,150 +/- 530 BP (Beta-189092). …… The latest mammoth remains in mainland Alaska are dated to around 11,400 BP.   Since the age of this tusk places it beyond the range of initial human habitation in the New World, as currently understood, we posit that the tusk was worked by later inhabitants of the area.

The authors note that it is possible to diagnose from the reduction strategies used whether ivory was worked when fresh/green or when already subfossilized,  though curiously they draw no such conclusions about this particular piece.  I find it intriguing how a central Beringian artifact made on a 35,000 year old material is so readily characterized as a recent manufacture.  While this piece would pre-date the earliest known record of extreme NE Asia and while I wouldn’t second-guess the authors nor impugn their motives and while it is certainly possible that a fossil mammoth tusk was worked at a much later date, I’m, uh, just sayin’.   This paper is interesting on a number of levels, not least as an example of stickhandling around competing paradigms.

Detail of working method of Alaskan tusk. Source: Gelvin-Reymuller et al

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Posted in alaska, Archaeology, palaeontology, Technology

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Paisley Cave Update

Posted on November 25, 2009 | 35 comments

Paisley Cave human coprolite dating older than 14,000 cal BP. Source: PBS.

There is a tantalizing news item in a recent edition of Nature indicating that the team led by Dennis Jenkins has found a bone tool in the old layers at Paisley Cave in southern Oregon.  This cave already returned a number of pre-Clovis dates on human coprolites.  Although there was some vociferous opposition to this finding, a vigorous defence of these feces was mounted and to my mind was effective.  (Note that one of those claiming the human poop is actually camel poop posts a slightly hysterical online comment on this Nature news item.  This charge of excess fibre is dealt with in Gilbert et al’s 2009 rebuttal in Science, which is not mentioned in the Nature comment.  Clearly there is a new generation of data-selective Clovis Police being groomed out east.)

Anyway, this bone tool, which I assume will be published soon, is said in the Nature article to date to 14,230 cal. BP, from which I infer a 14C estimation of about 12,250 – exactly contempraneous with the poop.  According to the article,

The dating of the bone tool, and the finding that the sediments encasing it range from 11,930 to 14,480 years old, might put these questions to rest. “You couldn’t ask for better dated stratigraphy,” Jenkins told the Oregon meeting.

Seeing the tool itself will of course be very interesting and hopefully definitive, as there is a long history of bone pseudo-tools in North American archaeology.  So far this date has only been announced at an unspecified “meeting” and peer reviewed publication will be essential to form a final judgment.

You can watch a PBS news clip on the poop discovery from a link here which gives a good idea of the setting of the cave, and also includes nice footage of Luther Cressman!

Camel astragalus from Paisley Cave. Source: U of Oregon.

Reference:

Dalton, Rex. 2009. Oldest American artefact unearthed: Oregon caves yield evidence of continent’s first inhabitants.  Nature: doi:10.1038/news.2009.1058.

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Posted in Archaeology, Northwest Interior, Oregon, palaeontology

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Another snag for “Clovis First”

Posted on November 24, 2009 | Leave a comment

Mastodon! From: Science 20 November 2009

Abundant megafauna are important to the Clovis-First model of the peopling of the Americas because the mechanism for what was considered to be an exceptional event or series of events was overkill of these large, naive, critters .  Overkill led first to localized extirpations (moving the Clovis folks along on a bow-wave of blood) and ultimately to megafaunal extinctions across the hemisphere.

Sad, then, for that particular story and its storytellers, to see recently reported results in Science which track (through samples of dung fungus) a millenium-long decline in mastodon and other megafauna before the arrival of Clovis.  This decline might relate to climate change or to the influence of pre-Clovis humans – it’s too early to say.  But as the graph below shows, the decline set in pre-Clovis at about 14,800 cal B.P., and by the time of Clovis (ca. 13,500 cal B.P.), far from being hyperabundant, herbiferous megafauna seem to have been at a historically low level of population.  Vegetation change (often used to track climate) was a result of this die-back, not the cause of it.   Perhaps this remnant megafauna population was then finished off by Clovis, but that is hardly a bow-wave of blood scenario, but rather a “mopping up” of increasingly scarce game.  Has there ever been as misunderstood an archaeological concoction as the Clovis Culture?

Update: The Guardian has coverage, incongruously illustrated by the RBCM’s life-sized mammoth model.

Reference:

Jacquelyn L. Gill, John W. Williams, Stephen T. Jackson, Katherine B. Lininger, Guy S. Robinson.

Pleistocene Megafaunal Collapse, Novel Plant Communities, and Enhanced Fire Regimes in North America.

Science 20 November 2009: Vol. 326. no. 5956, pp. 1100 – 1103

DOI: 10.1126/science.1179504

Pre-Clovis decline of large herbivores. Source: Science 20 November 2009

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Posted in Archaeology, Miscellaneous, palaeontology

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Annotate This

Posted on September 26, 2009 | Leave a comment
Surely they could have painted a mammoth on this somewhere.....

Surely they could have painted a mammoth on this somewhere.....

Flickr usr Travis S. does a nice, understated job of annotating this hilarious reconstruction of the “Ice Free corridor” from the Santa Barbara Museum of Natural History.  Click on the image to go to the original.  This picture pretty much sums up the absurdity of the Ice Free corridor — magical parting of the white sea while the coast is socked in under a mile of solid fog.  Funny how such reconstructions were made before serious geological investigation of their truth content, and funnier still how archaeologists just slurped up the ice free corridor as the answer to their need to get the FIRST AMERICANS (nevar forget!)  into Wyoming, well,  first.

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Posted in alaska, Archaeology, Northwest Coast, odd

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Fieldwork Picture of the Day 8

Posted on September 12, 2009 | Leave a comment
black bog abbey road

John, Walrus, George and the Sandhill Crane

In which we do our best impression of the Beatles Abbey Road cover on Porcher Island (map).  Lining up like this was necessary because the surface of this bog was so mucky we had to dismantle an old grow-op to make a trail across the surface (yes, we then dismantled our trail).  This bog is a few metres  above sea level, but quite quickly down in the core sample there was a clear break to marine sediments, showing sea level had once been higher than today and then dropped to or past modern.  Carbon dating a piece of sediment from the interface showed sea level had fallen past this point by  10,000 years ago.

Terrestrial (left) overlay marine (right) sediments.

Terrestrial (left) overlay marine (right) sediments.

The picture to the right shows the core sample, with the clear distinction made between the brown, terrestrial, pond deposits to the left (upper) side of the core) while in the right (lower, older) part of the core you can see the sediments turn to a greenish marine clay, which contained small shell fragments and salt-water diatoms.  Taking a number of these core samples from different elevations (and therefore of preumptively different dates of sea level change) allows us to stitch together a curve or graph of sea-level history.  Using this curve, we can then identify ancient coastlines (both underwater and above high tide) with greater certainty and accuracy, allowing for more efficient and productive archaeological survey on these ancient landforms.  On the map linked above, you can see the long linear lakes and ponds paralleling the modern shoreline.  These lakes highlight the former  eastern shores of  Oval Bay at higher sea levels.

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Posted in Archaeology, fieldwork, Northwest Coast, pics

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