Difference between revisions of "Beam"
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[[File:Fig 45.jpg|thumb|<font size="2">'''Fig. 2.''' Alveolar exoskeleton and polygonal network. | [[File:Fig 45.jpg|thumb|<font size="2">'''Fig. 2.''' Alveolar exoskeleton and polygonal network. | ||
'''A-C:''' simple alveolar layer in ''Everticyclammina virguliana'' (Koechlin), Mechra Klila, Northeastern Morocco, Uppermost Jurassic. '''A:''' stereograph, schematic, not to scale. '''B:''' tangential section. Note the large size of the alveoles in a postseptal position. '''C:''' para-equatorial, non-centered section showing septa and the basal coat at the bottom of the chamber, resembling a basal layer. '''E-G:''' polygonal network in ''Spirocyclinidae''. '''E:''' ''Choffatella tingitana'' Hottinger, megalospheric generation, in tangential section near to the equatorial plane. Note the clear differentiation of beams and rafters. '''D:''' stereograph of spirocyclinid polygonal network. Note the curved pigeon holes in preseptal position which in axial section might be mistaken for foramina. '''F-G:''' extension of beams into a corrugated sheet that replaces endoskeletal pillars in ''Hottingertidae''. '''F:''' stereograph representing a part of an axial section. Not to scale. '''G:''' ''Alveosepta powersi'' (Redmond), Northeastern Morocco, Upper Jurassic. Equatorial section of megalospheric specimen. | '''A-C:''' simple alveolar layer in ''Everticyclammina virguliana'' (Koechlin), Mechra Klila, Northeastern Morocco, Uppermost Jurassic. '''A:''' stereograph, schematic, not to scale. '''B:''' tangential section. Note the large size of the alveoles in a postseptal position. '''C:''' para-equatorial, non-centered section showing septa and the basal coat at the bottom of the chamber, resembling a basal layer. '''E-G:''' polygonal network in ''Spirocyclinidae''. '''E:''' ''Choffatella tingitana'' Hottinger, megalospheric generation, in tangential section near to the equatorial plane. Note the clear differentiation of beams and rafters. '''D:''' stereograph of spirocyclinid polygonal network. Note the curved pigeon holes in preseptal position which in axial section might be mistaken for foramina. '''F-G:''' extension of beams into a corrugated sheet that replaces endoskeletal pillars in ''Hottingertidae''. '''F:''' stereograph representing a part of an axial section. Not to scale. '''G:''' ''Alveosepta powersi'' (Redmond), Northeastern Morocco, Upper Jurassic. Equatorial section of megalospheric specimen. | ||
| − | '''alv:''' alveoles; '''b:''' [[beam]]; '''bl:''' [[basal layer]]; '''corr:''' corrugated median extension of beams; '''f:''' [[foramen]]; '''ph:''' pigeon holes; '''s:''' [[septum]]; '''sf:''' supplementary foramina; '''sph:''' [[sphaeroconch]]; '''ssut:''' [[septal suture]]. Arrows: direction of growth. After Hottinger, 1967.; (Hottinger, 2006; fig. 45 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]] | + | '''alv:''' alveoles; '''b:''' [[beam]]; '''bl:''' [[basal layer]]; '''corr:''' corrugated median extension of beams; '''f:''' [[foramen]]; '''ph:''' pigeon holes; '''s:''' [[septum]]; '''sf:''' supplementary foramina; '''sph:''' [[sphaeroconch]]; '''ssut:''' [[septal suture]]. '''Arrows:''' direction of growth. After Hottinger, 1967.; (Hottinger, 2006; fig. 45 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]] |
[[File:Fig 19.gif|thumb|<font size="2">'''Fig. 3.''' Henson's "subepidermal partitions" (1948, text-figs. 6-7). | [[File:Fig 19.gif|thumb|<font size="2">'''Fig. 3.''' Henson's "subepidermal partitions" (1948, text-figs. 6-7). | ||
