A three- and two-dimensional documentation of structural elements in schwagerinids (superfamily Fusulinoidea) exemplified by silicified material from the Upper Carboniferous of the Carnic Alps (Austria/Italy): a comparison with verbeekinoideans and alveolinids

Silicified schwagerinids (superfamily Fusulinoidea v. Moeller 1878) from the Upper Carboniferous (Carnic Alps, Austria and Italy) were isolated from cemented carbonate rocks using hydrochloric acid. The shells show details of the wall texture and of internal structures in three dimensions which are...

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Bibliographic Details
Published in:Facies 2005-11, Vol.51 (1-4), p.541-553
Main Authors: Leppig, Ursula, Forke, Holger C, Montenari, Michael, Fohrer, Beate
Format: Article
Language:English
Subjects:
Biogeochemistry
Carbonate rocks
Carboniferous
Hydrochloric acid
Mollusks
Permian
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Summary:Silicified schwagerinids (superfamily Fusulinoidea v. Moeller 1878) from the Upper Carboniferous (Carnic Alps, Austria and Italy) were isolated from cemented carbonate rocks using hydrochloric acid. The shells show details of the wall texture and of internal structures in three dimensions which are illustrated with SEM pictures. Thin sections from hand specimens provided two-dimensional sections of the shell for comparison. The functional significance of fusulinoidean internal structures is discussed and compared with verbeekinoideans and alveolinids. Particular attention is paid on the disposition of the different openings within the shell and from the chamber lumen to the outside which reflects the direction of protoplasmic flow. Based on the knowledge of the nature of protoplasm ultrastructure in Recent foraminifera and its biological significance we draw some conclusions about the nature of protoplasm in fusulinoideans and its change within the Permian verbeekinoideans.[PUBLICATION ABSTRACT]
ISSN:0172-9179
1612-4820
DOI:10.1007/s10347-005-0014-4