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1981 Excavation of a Postmold
This photograph shows the top part of an area where a post was located. The post rotted and turned the soil a darker color than the surrounding soil. The rotted post soil is, in effect, a “mold” of the post, and so it is called a postmold. This postmold was very easy to identify because of the difference in color between the surrounding soil and the postmold. But sometimes, the color of the postmold and the surrounding soil is very similar, so it is sometimes very difficult to identify postmolds.
Photo credit: Don Sepulvado
Source: Williamson Museum, Northwestern State University, Natchitoches, Louisiana