Descripteur : Rows number of carcass perforations per intersept (IW)

Type du descripteur : categorical

Intersept: Part of a wall or intervallum between two adjacent radial vertical structures (septa, taeniae...).

Carcass: Part of wall on intervallum side.

IW: Inner wall.

Stirrup perforations only

Stirrup perforations: Perforation in front of each vertical intervalar structure.

NB: Transverse section resembles stirrup.

Stirrup perforations AND more than 2 rows per intersept

1 perforation spanning several intersept

1 row per intersept only

1 AND 2 rows per intersept

2 rows per intersept only

More than 2 rows per intersept only

No vertical intervallar element

Hiérarchie

Type of carcass perforations: inner wall (IW)
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 |_ Rows number of carcass perforations per intersept (IW)