62. This slide and the next show examples of soft-sediment, plastic deformations of fine-grain material. Both are from the New Madrid seismic zone.

Knife in this photograph, a vertical view, is about 5 cm long. Pseudonodules and warped bedding within the 20-cm-thick blue bed are of nonseismic origin. Such deformed features are plentiful in much of the New Madrid seismic zone, and in the great majority of sites are of nonseismic origin. Fine-grained blue material is a very soft montmorillonite-rich clay, which was laid down by floodwater.