Figure 19.4   Variations in the physical nature of the sediment may create variations in the appearance of a trace fossil. Here, a subsurface, patch-feeding burrow develops different morphologies, and therefore has different names, when preserved: (a) in sand (Scalarituba), (b) at a sand–mud interface in fi rm sediment (Nereites), (c) at a sand–mud interface in wetter sediment (Neonereites), and (d) at a mud–sand interface, seen from below (Neonereites). (Based on Ekdale et al. 1984.)

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