Moving Inside the Enclosure

Early in Week Five we were fortunate to have the assistance of the Museum's Future Scientists under the direction of Dr. Jeff Day and supervisors Lin and Frank. Not one to miss such an opportunity, I set them to work excavating two three by three meter units to the east of the enclosure trench. These young men and women did an excellent job removing 30 cm of plow zone soils using rounded shovel, flat shovels, hoes, and finally trowels. On the way down they discovered lots of stone tool debris, fire-cracked rock, and a few artifacts such as a Late Prehistoric period triangular (Madison type) arrow point and a corner-notched (Middle Woodland) dart tip. Here they are in their freshly-dug units.


As a result of their efforts, we were able to examine an 18-square meter area of the enclosure interior. This was our first foray 'inside', and we did not know what we would find. When we did the final troweling and sweeping of the unit floors the next day, we identified several dark feature stains and numerous post molds. In the western unit (shown below) we defined a large oval stain that appears to have been the source of yet another magnetic anomaly.


Upon excavation of this feature (09-26), we found a shallow pit containing a large quantity of charcoal and FCR, just the stuff to produce a strong magnetic signal. Unfortunately, no diagnostic pottery or stone tools were found, but this feature still provides important 'ground-truth' data on the magnetic signatures of prehistoric features at the site.

Intrusive Features and the Enclosure

During weeks four and five, another two meter-long section of the enclosure trench (Fea. 09-10) was completely excavated. This section is located just northwest of the first trench section that produced the distinctive Leimbach series ceramics. This neighboring bit of trench turned out to be very similar in terms of its contents and stratigraphy, with one important exception. As shown in the section view below, the trench contained alternating layers or light and dark soil which represent episodes of filling.


The large hole in this profile was made by an intrusive pit feature that contained thin, finely cordmarked pottery of the Esch Cordmarked variety. We believe these ceramics are associated with the Middle Woodland occupation of the site due to their resemblance to pottery from the Esch Mounds, formerly located about four miles downriver. We found similar sherds during weeks one and two associated with bladelets, our best Middle Woodland diagnostic.

At the bottom of the trench, we found a cluster of thick, cordmarked sherds of the Leimbach series. As seen in the following image, they represent a large section of a vessel. One base sherd was rounded, unlike the flat-bottomed base sherd found next door.


Thus, the 'superpositioning' of these ceramic wares (i.e., Leimbach in the earlier trench and Esch in the later pit feature) nicely illustrates the succession of Woodland period occupations at the site. It also tells us that the enclosure trench was deliberately filled during the Early Woodland time period and not by later Middle Woodland arrivals, as is apparently the case with the large parallel ditches to the west. What this says about the function of the enclosure is still not clear.

Early Woodland Pottery from the Enclosure

By the close of week four, we had excavated a total of six meters of the enclosure trench. In each section, ceramics similar to Early Woodland Leimbach Cordmarked forms were found. These relatively thick, grit-tempered sherds with somewhat coarse cordmarking were found at all levels of the feature. The sherd shown below illustrates the flat-bottomed, "flower pot" shape typical of many Leimbach vessels.


Near the bottom of the trench we found a large body sherd (shown below) with a distinctive knob handle, also typical of Leimbach wares.

At the nearby Seaman's Fort site, similar sherds have been found in pit features dated between 500 and 100 B.C. Like the Heckleman site, Seaman's Fort was enclosed by two large ditch features but lacked the interior oval enclosure that we are now investigating.