Difference between revisions of "Chessboard pattern"

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[[File:Fig 08.jpg|thumb|<font size="2">'''Fig. 1.''' Alternating arrangement of shell compartments in the three dimensions of space. Examples from Gulf of Aqaba, Red Sea; Recent. '''A-B:''' Alternating chamber arrangement in the linear dimension (= biserial arrangement) as in ''Textularia foliacea'' Heron-Allen et Earland, SEM and X-ray graphs of lateral view. '''C-D:''' Alternating chamberlet arrangement in the planar (second) dimension, as in annular-concentric, discoidal shell of ''Planorbulinella elatensis'' Thomas, SEM graph of lateral view and equatorial section in transmitted light microscopy, coloured. '''E:''' Stereograph showing alternating chamberlets of a main chamberlet layer, with main stolon axes (horizontal arrows) and retrovert stolons feeding lateral chamberlet (vertical arrows). Schematic, not to scale. '''F-G:''' Alternating chamberlet arrangement in the third dimension producing a chessboard pattern, as in the spherical-concentric, globular shell of ''Sphaerogypsina globulus'' (Reuss), SEM graph of external view and centered section in transmitted light micrograph, coloured. '''H:''' Stereograph showing alternating chamberlets forming chessboard pattern. Schematic, not to scale.
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[[File:Fig.8F-H.png|thumb|<font size="2">'''Fig. 1.''' Alternating arrangement of shell compartments in the three dimensions of space. Examples from Gulf of Aqaba, Red Sea; Recent; '''F-G:''' Alternating chamberlet arrangement in the third dimension producing a chessboard pattern, as in the spherical-concentric, globular shell of ''Sphaerogypsina globulus'' (Reuss), SEM graph of external view and centered section in transmitted light micrograph, coloured. '''H:''' Stereograph showing alternating chamberlets forming chessboard pattern. Schematic, not to scale; Colours: '''red''' and '''blue''': alternating generations of shell compartments; green: nepiontic, early stages including proloculus.
Colours: '''red''' and '''blue''': alternating generations of shell compartments; green: nepiontic, early stages including proloculus.
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'''a;''' [[aperture]]; '''f:''' [[foramen]]; (Hottinger, 2006; fig. 8 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
'''a;''' [[aperture]]; '''ch:''' [[chamber lumen]]; '''chl:''' [[chamberlet lumen]]; '''f:''' [[foramen]]; '''lchl:''' lateral chamberlet lumen; (Hottinger, 2006; fig. 8 [http://paleopolis.rediris.es/cg/CG2006_M02/index.html] '''CC'''/BY-NC-SA)]]
 
 
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==Definition==
 
==Definition==

Latest revision as of 12:51, 15 April 2019

Fig. 1. Alternating arrangement of shell compartments in the three dimensions of space. Examples from Gulf of Aqaba, Red Sea; Recent; F-G: Alternating chamberlet arrangement in the third dimension producing a chessboard pattern, as in the spherical-concentric, globular shell of Sphaerogypsina globulus (Reuss), SEM graph of external view and centered section in transmitted light micrograph, coloured. H: Stereograph showing alternating chamberlets forming chessboard pattern. Schematic, not to scale; Colours: red and blue: alternating generations of shell compartments; green: nepiontic, early stages including proloculus. a; aperture; f: foramen; (Hottinger, 2006; fig. 8 [1] CC/BY-NC-SA)

Definition

  • according to Hottinger (2006):

CHESSBOARD PATTERN - a chamberlet arrangement in superposed chamberlet layers in alternating positions resembling those of a chessboard: in one layer, the position of the chamberlets corresponds to the black fields, in the following layer to the white fields, as in Sphaerogypsina. The outline of the chamberlets may be quadratic, polygonal or somewhat irregular. This three-dimensional array corresponds to the annular chamberlet arrangement, that is alternating radial positions in the second dimension.




References

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


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