Box The nine ichnofacies

Repichnia Cubichnia

The Nereites ichnofacies Fig. 19.13a is recognized by the presence of meandering pascichnia such as Nereites, Neonereites and Helminthoida, spiral pascichnia such as Spirorhaphe, and agrichnia such as Paleodictyon and Spirodesmos. Note that the whole concept of agrichnia is debated the most commonly quoted example, Paleodictyon, has been interpreted as the mold of a deceased, soft-bodied, colonial-type organism, although others dispute this new view. Vertical burrows are almost entirely absent....