This week brought some interesting finds at the Morton Village dig site near Lewistown, Illinois....
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An unusually large pit feature measuring over four feet deep. It may have been a storage pit that was emptied at one point and refilled with garbage. The depth is typical of storage pits.
At the top of the picture you notice the hole is straight and flat like a wall. This is how the profile (center slice) of the pit feature is exposed. If you look in a profile, you can see the shape and border of the pit, making it easier to excavate the other half of the pit. Some pits have post molds or other pits dug into the same area. Profiles help distinguish these different overlapping features.
In this image it is easy to see the layers and different colors of earth. On the profile wall, you can see 'layers' of different colored dirt. This is likely because the people who used it as a garbage pit would place a layer of garbage down, then 'cap' it with a layer of dirt. This continues until the pit is full. This dig showed evidence of capping, and because the soil content was acidic here, much organic material breaks down. We don't see evidence of the organic remains as whole artifacts. We did, however, find a chunk of red ochre (or possibly hematite) and a huge limestone rock.
Also of note is the whitish colored earth at the bottom of the pit, located in the upper left-hand corner of the excavated hole. On the left side, midway down the hole, a scoop is removed from the wall. This is where several pottery sherds were found, likely from an Oneota pot.
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It might be hard to see, but along the middle of the image are two darker colored streaks going from bottom to top. They look a bit like tire tracks from a vehicle. However they are evidence of wall trenches that form a large circular structure. Here is only a few feet of the wall trenches. When we say LARGE structure, we are talking 40 to 60 feet in diameter!
Wall trenches result when people dig into the soil a certain depth, then place upright logs in the trench to make a palisade-like wall. Think privacy fence made of whole logs. What we see is the discolored stain of either the organic remains of the posts or fill dirt that drifted in after the wall trench was emptied. Some of the graduate students working on the dig mused that this great circle may have been open at the top- no roof. The trench walls are concentric- one wall within another wall not because there was a double wall, but because one feature may have been constructed first, while a second was constructed to replace or enlarge the first feature.
Around the edges of this image you can see several post mold excavations.
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Here we see an exceptionally dark post mold discoloration, easily defined by the dark blackish soil. You can also see the circular shape. Of course, it could also be the remains of a tree root. Excavation will provide more information. The first post mold Gwen excavated was about 9 inches deep. Some run 2 to 3 feet deep.
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