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Fig. 1. A cone composed of a single series of discoidal chambers of which the marginal and axial areas are differentiated by colour. Note the distribution of the marginal area, the emplacement of the exoskeleton, and of the axial area housing the endoskeleton, in axial, horizontal (basal) and transverse sections. The axis of the shell is indicated by a vertical arrow. The surface of the cone is called the cone mantle, its horizontal termination is the cone base. A vertical line on the slanting surface of the cone is called a cone mantle line. The cone radius is indicated by a double arrow; (Hottinger, 2006; fig. 80b [1] CC/BY-NC-SA)


  • according to Hottinger (2006):

BASAL - at the base or parallel and proximate to the base of a structural element or of a complete architecture.

Remarks: The term is occasionally used for interiomarginal apertures or foramina at the base of the apertural face adjacent to the previous whorl (in contrast to areal) or for the base of a cone in conical shells including sections in or parallel to the base of the cone. See also basal layer.

See also


Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744

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