On of the main questions in play over the last couple of days in the field concerns the nature of Zone 2, the dark zone of sediment present immediately beneath the plowzone. I vacillated on whether it was a second, buried plowzone or an intact, prehistoric cultural deposit (i.e., a thin midden). Because I wasn't sure either way, I erred on the side of excavating it as though it was an unplowed deposit, having the students shovel skim and piece-plot.
This Friday, we finally got to the bottom of Zone 2 in two of the block units (Units 4 and 6). Lo and behold . . . plow scars. So it looks like Zone 2 has been plowed after all.
This Friday, we finally got to the bottom of Zone 2 in two of the block units (Units 4 and 6). Lo and behold . . . plow scars. So it looks like Zone 2 has been plowed after all.
The base of Level 5 in Units 4 and 6, with sediment zone boundaries scribed with a trowel. The dark, linear, parallel stains were caused by pentration of a plough into the lighter zone beneath. It appears as though plowing went in two directions at different times.
Calling Zone 2 a "plowzone" doesn't end my questions about it. For one, there are subtle lenses within the zone (visible in profile) that seem inconsistent with a plowzone and need to be explained. For two, the variable nature of the boundary between Zones 2 and 3 suggests that, if Zone 2 was originally accumulated as a surface midden, there is the distinct potential that unplowed pockets of the midden remain intact. For three, we need to explain the origin of all the lighter sediment that was somehow deposited on top of Zone 2, burying it and shifting the modern plowzone upward. While I'm not sure we'll be able to answer those questions this field season, I am happy that we've recovered what appears to be a nice little assemblage of Mississippian-age ceramic and lithic debris.
We're removing the last remnants of Zone 2 with a shallow level (Level 6, about 5 cm in depth) intended to get rid of the plowscars and level the units off at an even 75 cm below datum. As of the end of the day on Friday, Level 6 was in progress in Units 4 and 6. Unit 5 was finishing up the last of their Zone 2 level (Level 4 in that unit).
We're removing the last remnants of Zone 2 with a shallow level (Level 6, about 5 cm in depth) intended to get rid of the plowscars and level the units off at an even 75 cm below datum. As of the end of the day on Friday, Level 6 was in progress in Units 4 and 6. Unit 5 was finishing up the last of their Zone 2 level (Level 4 in that unit).
Work in progress in the block.
With Zone 2 removed, we'll now be able to press downward and get a look at what's beneath it. In the wall left by the original machine cut, two good-sized pit features (Features 4 and 5 in the profile drawing) originate in Zone 3. Intact cultural features (i.e., hearths, postholes, pits) should be relatively easy to discern against the fairly light matrix of Zone 3.
Profile of machine cut showing Zone 3 and locations of Features 4 and 5 which originate in Zone 3.
With work just beginning below Zone 2, it already looks different. In Unit 6, the top of Zone 3 has revealed a couple of large (golf ball-sized) pieces of fire-cracked rock and a charcoal-rich stain that could be the top of a cultural feature. We'll learn more about Zone 3 during our next day in the field.
Meanwhile, in the "downstairs" portion of the site, we finally opened Unit 7 (Jim Legg could not join us, so work on Unit 9 was paused). Unit 7 is a 1m x 2m unit placed to investigate what, if anything, is beneath the deposits exposed in the machine cut. While the short answer, so far, is "not much," the deep sediments are not sterile: there was at least one piece of fire-cracked rock in the second level of Unit 7. I'm not anticipating we'll run into a heavy prehistoric deposit, but at this point we don't have any data about what's down there other than a single exploration I did with a 3" bucket auger. A few more levels in Unit 7 have the potential to tell us quite a bit, as even a relatively sparse occupation will probably be detectable in levels from a 1m x 2m unit.
Meanwhile, in the "downstairs" portion of the site, we finally opened Unit 7 (Jim Legg could not join us, so work on Unit 9 was paused). Unit 7 is a 1m x 2m unit placed to investigate what, if anything, is beneath the deposits exposed in the machine cut. While the short answer, so far, is "not much," the deep sediments are not sterile: there was at least one piece of fire-cracked rock in the second level of Unit 7. I'm not anticipating we'll run into a heavy prehistoric deposit, but at this point we don't have any data about what's down there other than a single exploration I did with a 3" bucket auger. A few more levels in Unit 7 have the potential to tell us quite a bit, as even a relatively sparse occupation will probably be detectable in levels from a 1m x 2m unit.
Work begins on Unit 7. Elevations for this unit are controlled the old-fashioned way, using a notched stake, line level, and string.
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