View source for Basement

[[File:Fig 70.jpg|thumb|<font size="2">'''Fig. 1.''' Odd association and polar structures in ''Praealveolina tenuis'' Reichel. From Alcantara, Lisbon; Cenomanian. Transmitted light micrographs.
'''A:''' microspheric specimen, axial section; '''B:''' megalospheric specimen, axial section; '''C-E:''' odd partners: '''C:''' axial section of microspheric ''Simplalveolina sp.''; '''D:''' axial sections of megalospheric ''Simplalveolina sp''.; '''E:''' ''Ovalveolina sp'', axial section. '''F:''' microspheric ''P. tenuis'', axial section, detail showing polar structure with floors and shaftsin the basement. '''G:''' model of two subsequent chambers near their polar ends where the first floors in the basement appear. '''H:''' model of the protoplasmic body filling the cavities in G. Both models schematic, not to scale, after Reichel, 1933.
'''a:''' [[aperture]]: '''af:''' [[apertural face]]; '''bchl:''' basement chamberlets; '''bl:''' [[basal layer]]; '''chl:''' (main) [[chamberlets]]; '''fl:''' [[floor]]; '''prp:''' [[preseptal passage]]; '''rp:''' (incipient) residual pillar; '''s:''' [[septum]]; '''sa:''' [[supplementary aperture]]; '''sh:''' [[shaft]]; '''sl:''' [[septulum]]; '''sut:''' cameral suture; (Hottinger, 2006; fig. 70 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
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==Definition==
*''according to Hottinger (2006):''
'''BASEMENT''' - cavities below a main chamberlet layer, developing polewards in elongate alveolinids, delimited by floors and septula, opening into a preseptal space and connected vertically by shafts, as in ''Praealveolina''.














==References==
Hottinger (2006), [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Illustrated glossary of terms used in foraminiferal research]. [http://paleopolis.rediris.es/cg/uk-index.html Carnets de Géologie], [http://paleopolis.rediris.es/cg/CG2006_M02/index.html Memoir 2], ISSN 1634-0744   

Reichel (1933), Sur une alvéoline cénomanienne du Bassin du Beausset. Eclogae geologicae Helvetiae, Basel, vol. 26, N° 2, p. 269-280.                                        
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