Planolites Nicholson, 1873

DESCRIPTION: Simple, unlined, unbranched cylindrical or subcylindrical infilled burrows, straight to gently curved, horizontal to oblique to bedding planes. Burrows may cross-over. Lithology of fill differs from that of host rock.

BEHAVIOR(S): Deposit feeding, dwelling.

ENVIRONMENTAL SETTINGS: Shallow marine - deep marine deposits to continental. Found in alluvial, lacustrine, and eolian settings.

POSSIBLE TRACEMAKERS: Various invertebrate burrowing organisms including worms and insects.

GEOLOGIC RANGE: Precambrian-recent.

ADDITIONAL REFERENCES: (Hantzschel, 1975)(Pemberton and Frey, 1982)(Fillion and Pickerill, 1990)(Buckman, 1995)(Keighley and Pickerill, 1995)(Uchman, 1998)(Ekdale et al., 2007: eolian)

REMARKS: Often difficult to distinguish between Palaeophycus, a passively filled burrow, from Planolites, a burrow formed by active backfill that may be of similar size, shape and orientation (Pemberton and Frey, 1982; Buckman, 1995; Keighley and Pickerill, 1995).