Descriptor : Type of folds affecting both walls

Descriptor type : categorical

Fold: Succession of more or less regular annulations of both walls.

../images/folds_irregular_longI.png

Type of folds affecting both walls


Longitudinal folds (stellate transverse section)

Longitudinal fold: Succession of more or less regular transverse annulations of cup.

Regular: Folds are periodic and synchronous.

../images/orbiasterocyathus_geriI.png

Longitudinal folds (stellate transverse section)

Transverse folds

Transverse fold: Succession of more or less regular longitudinal annulations of cup.

Regular: Folds are periodic and synchronous.

../images/incurvocyathus_voronovae3I.png

Transverse folds

../images/orbicyathus_mongolicus2I.png

Transverse folds

../images/yhecyathus_futchinensisI.png

Transverse folds

Irregular folds

Irregular: Folds aren't periodic and synchronous. They can be transverse and/or longitudinal.

Transverse fold: Succession of more or less regular longitudinal annulations of cup.

Longitudinal fold: Succession of more or less regular transverse annulations of cup.

../images/coscinoptycta_convulata1I.png

Irregular folds

../images/folds_irregular_longI.png

Irregular folds


Hierarchy

Shape of cup bulges
 |
 |_ Type of folds affecting both walls
    |
    |_ Shape of folds affecting both walls {Longitudinal folds (stellate transverse section) , Irregular folds}

Belongs to the groups