''Undichna britannica'' is a
fish
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of li ...
-fin, or fish-swimming
fossil trackway left as a
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
impression on a substrate; this type of fossil is an
ichnofossil, and in this case an
ichnospecies.
The ''U. britannica'' fish-fin tracks, or trackways are often associated with current or wave
ripple marks, probably shallow water, near-shoreline. Other deep water varieties may be less common, or associated with narrowed current flow between obstructions. The sinusoidal high points of the ripple marks may lend itself to the formation of the trackways.
See also
*
Trace fossil
*
Fossil trackway
External links
Photo-(non-ripple mark associated)
– (kgs.ku.edu) - "Kansas Geological Survey"
Fish trace fossils
Fossil trackways
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