Passively filled

Take me to the ichnology start page!

Take me back to the beginning of the determination key!

Take me to the alphabetical list of ichnogenera!

Is the winding or meandering, (sub)horizontal, branched burrow with a passive filling lined or without lining? Please, choose accordingly:

  1. With lining/mantle
  2. Without lining/mantle

Take me to the ichnology start page!

Take me back to the beginning of the determination key!

Take me to the alphabetical list of ichnogenera!

[Passively filled]