Mudboil with raised surface after excavation This photo shows a
mudboil that has developed a raised rim after excavation of its
carapace. See image 0220 for a further discussion of this
phenomenon, which is related to hydrostatic pressure developed
below the rigid carapace. The knife is 25 cm long. In this
example, the stable mudboil has developed a weak soil profile
similar to that shown in image 0221. Note the shrubby nature of
the vegetation rim that surrounds this mudboil in contrast to
the grassy rims evident in images 0220 and 0221. See detailed
discussion for image 0240. Updated 05/06/2010 AW