Does your (sub)horizontal, unbranched burrow with a cylindrical or a ridge-like appearance have a passive or an active filling?
- passive fill (in case of subrecent traces: NO fill)
- active fill
- both or cannot be determined. (Click on the ichnogenera below to get more information about their ichnospecies. Please allow for pop-up windows):
- Ovatiichnum (May also occur as surface trace (track, trail, impression, etc.))
- Ptychoplasma (May also occur as surface trace (track, trail, impression, etc.); ichnogenus includes ornamented ichnospecies)
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