Canal: Pore modified by skeletal structure thikening or by lintels streching. Canal length is greater than perforation diameter.
Lintel: Skeletal structure separating and bounding adjacent pores/canals.
Carcass: Part of wall on intervallum side.
IW: Inner wall.
Type of carcass perforations: inner wall (IW) | |_ Constitution of carcass canal system (IW) | |_ Building of carcass canals zones (IW) {1 zone} | |_ Shape of carcass canals tubes zone B (IW) {1 zone} | |_ Direction of carcass canals tubes zone B (IW) {1 zone} | |_ Porosity of carcass canals tubes zone B (IW) {1 zone}