Descripteur : General shape of folds affecting both walls

Type du descripteur : categorical

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

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General shape 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/0000folds_irregular_long.png

Irregular folds


Hiérarchie

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

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