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| Probing for buried archaeological deposits on old beach ridges |
Yesterday Molly and I surveyed Middle Bay for the landowner, Leisnoi Inc, and found very few archaeological sites. But this in and of itself is a very interesting discovery. In archaeology sometimes not finding something creates more of an interesting pattern than finding lots and lots of stuff (
click here for another example). Figuring out why you found nothing is where it gets interesting.
Over the past 15 years we have done a lot of archaeology in neighboring Womens Bay and there are archaeological sites everywhere. In particular there are a great many sites older than 4000 years (10 of them by my count) and most of these are on old terraces at the very head of the bay. Womens Bay and Middle Bay look pretty similar so you would think they would have similar archaeological resources. But not so - yesterday we surveyed hard and only found one prehistoric site, and there are no known sites in the bay older than 4000 years.
We looked very hard too, and in all the same sorts of places as where we found sites in Womens Bay. We walked old shorelines and used the soil probe to look for buried archaeological deposits. We probed the tops of flat terraces over looking the bay and river. Nothing. In Womens Bay you can't throw a shovel without having it bury itself into a 4000 year old site, but not so in Middle Bay. Why?
Perhaps there is a geologic reason. Maybe all the older sites have eroded away. But no - it seems to have a very similar geologic history to Womens Bay. We could see all the same analogous paleo shorelines and terraces. Both bays have remarkably intact archaeological records with shorelines that have prograded out away from shore rather than eroded with time. So if these sites ever were there in Middle Bay they should still be there.
I suspect that there is a biological difference between the 2 bays. I think there was something in Womens Bay that was lacking in Middle Bay. My theory is that until about 4000 years ago there was a large lake in the Salonie Creek valley, and that it probably had a productive red salmon run much like Rosetead Lake out at Pasagshak does today. Seals chased the salmon into the lake and both species attracted hungry Alutiiq hunters.
4000 years ago there was a large volcanic eruption and Kodiak was covered with ash (much like the 1912 Katmai eruption). I think the ash filled the shallow lake and that was that - no more lake. Of course this is just a theory. Now to test it we have to go examine the Salonie Creek valley for evidence of a lake. Patrick
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| Traipsing through a cottonwood grove while checking on likely places for really old archaeological sites |
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| We got one! A prehistoric housepit - it probed positive for charcoal |
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| Molly documenting erosion at an archaeological site |
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| Alas no sites in view - but also quarried for gravel back in the day |
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| Pretty cottonwood tree bark |
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| Beautiful day for a survey |