Saturday, November 24, 2007

Catastrophic flooding of the Black Sea and the expansion of agriculture in Europe

ResearchBlogging.orgBoth Ole and Chris have blogged about a new paper, published in Quaternary Science Reviews, that discusses the link between the catastrophic inundation of the Black Sea and the expansion of agriculture in Europe during the Neolithic. I am not going to repeat what they already summarized well; I only want to expand a bit on what I see as the weak points of the Black Sea flood story. [Disclaimer: I am not an expert in the geology and stratigraphy of the Black Sea, and even less of an expert in archaeological matters].

While the recently published Turney & Brown paper presents some nice data and argues convincingly that the start of Neolithic expansion in Europe roughly coincides with the ~8300 yr BP age estimate for the catastrophic flooding of the Black Sea, this correlation does not necessarily suggest a cause-and-effect relationship. The question is still open: yes, the flooding might have caused the migration, but it is also possible that the two events are independently related to the same climatic changes. Very few of the radiocarbon dates, representing the earliest Neolithic sites in Europe, come from the territory of present-day Romania, yet one would expect that the low-lying areas along the lower Danube River would be the first places to be colonized by the population forced out from the inundated shelves of the Black Sea that are the widest east of the Danube Delta. Why are early Neolithic settlements so scarce in this area, which is good for agriculture? In their 1998 book, Ryan and Pitman suggest that Vinca farmers showed up abruptly along the Danube valley, soon after the flooding occurred. The earliest Vinca settlements however are dated at 7500 yr BP, so there is a gap of a few hundred years between the flood and these first settlements. That seems too long; in addition, even if the initial displacement of people living near the Black Sea resulted in the expansion of agriculture into Southeastern Europe, it is questionable how much effect this flooding had on the spread of Neolithic people into Northwestern Europe. It is unlikely that the main motivation to cross the English Channel for people living in today's Northern France was that their ancestors were scared off the shores of the Black Sea many hundreds of years before.

The image below is a screenshot from Google Earth, showing the data published by Turney and Brown. The Neolithic locations are color-coded according to their age, red being the oldest, and dark blue being the youngest. The KMZ file (made with GPS Visualizer and some help from Matlab) is available here.

Regarding the link between the Black Sea flood and Noah's story -- I think it is an interesting idea, but not much more. There were and there will be numerous large floods that affect human lives and human history, and the one featured in the Bible is so generic that it will be difficult to unequivocally link it to any specific event. In addition, the catastrophic flooding of the Black Sea might have been catastrophic only in a geological sense; calculations suggest that it took 34 years to erase the 155 m difference in water level between the Black Sea and the Mediterranean. The slow and relentless rise of the sea must have been disquieting and annoying to people living close to the shore, but, unless they built their huts in the middle of the Bosporus, it probably was not as traumatic for most of them as Hurricane Katrina was for lots of Gulf Coast residents.

The recent (I mean geologically recent) history of the Black Sea region is certainly fascinating and the controversy surrounding the exact sequence and nature of the events can only result in more top-notch oceanographic and archeologic research. And that is always exciting.

Friday, November 23, 2007

Where on (Google) Earth #72

After the big bend of the Irrawaddy River around an anticline in northern Burma (at T. rex eats fish), here is another Google Earth challenge, following in the tradition of a previous WoGE posted on Hindered Settling.

Schott rule in effect. Post time: 12:05 pm CST, 11/23/2007.

Wednesday, November 21, 2007

Meme of Four

Well, Hindered Settling got a bit too settled lately, so it's time to shake it up. Brian's tagging is a good excuse to do that, even though some of this may be too much detail. Here it goes, anyway.

4 jobs you’ve had:
1. teaching assistant (yes, it was a full time job in Romania)
2. does graduate work count as a job?
3. does serving in the Romanian Army count as a job? (probably no)
4. petroleum geologist

4 movies you could watch over & over:
1. Sideways
2. The Lives of Others
3. Annie Hall
4. Black Cat, White Cat

4 places you’ve lived:
1. Sfantu Gheorghe, Romania
2. Cluj, Romania (both #1 and 2 are in Transylvania as well)
3. Portola Valley, California (quite a change)
4. Houston, Texas (quite a change, again)

4 TV shows you love to watch:
1. Seinfeld
2. Extras
3. The Daily Show
4. Kitchen Nightmares (I admit it, too)

4 places you’ve been on holiday vacation:
1. Tuscany
2. Canadian Rockies
3. Paris
4. Yellowstone

4 authors you love to read:
1. Richard Dawkins
2. Steven Pinker
3. Bill Bryson
4. Jared Diamond

4 websites you visit daily:
1. Scienceblogs
2. New York Times
3. Macworld

4 of your favorite foods:
1. Avocado (I hated it a few months ago)
2. Pasta
3. Stuffed cabbage (Transylvanian style)
4. Cheese, mainly Italian

4 places you’d rather be:
1. skiing anywhere
2. in the Vargyas Valley (in Transylvania)
3. San Francisco
4. tasting wine, anywhere

4 lucky people to tag:
no tagging, but - of course - feel free to get and spread the meme

Thursday, November 01, 2007

Where on (Google) Earth #69

As soon as I saw the stunning geology in John's WoGE challenge, I started looking for the solution in the fold belts of Iran that have essentially zero vegetation. My search was successful, so here comes WoGE #69. Have fun.

North is up. Schott rule in effect. Post time: 10 pm CST, 11/01/2007.
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