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Raman spectroscopy of chitinozoans as a maturation indicator
Organic Geochemistry, 1995Abstract Micro-Raman spectra were acquired from a series of individual chitinozoans of low ( R ch 0.6%) to high thermal maturity ( R ch 5.1%). This provides information on their molecular and structural characteristics. All spectra show two broad bands on a fluorescent background at ∼ 1600 and 1355 cm −1 .
John E A Marshall
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Caradocian chitinozoans from the Central Basin, Tennessee
Review of Palaeobotany and Palynology, 1998Abstract Chitinozoans occur in low numbers and diversity in all formations of the Caradocian Stones River and Nashville Groups of the Central Basin, Tennessee. Sixteen species have been found in the interval studied: Belonechitina micracantha, B. robusta, B. seriespinosa, B. wesenbergensis, Calpichitina lata, Conochitina elegans, C.
William G. Siesser +4 more
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A revised chitinozoan classification
Journal of Paleontology, 1999The successful definition of chitinozoan genera depends primarily on the precision of the criteria used. A standardized morphological terminology based upon details from scanning electron microscope observations of the most representative taxa bearing these characters is therefore proposed.
Florentin Paris +3 more
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Ordovician chitinozoan zones from Baltoscandia
Review of Palaeobotany and Palynology, 1993On the basis of reports published over the last 60 years, and unpublished data, a chitinozoan zonation is proposed for the Ordovician sequence of Scandinavia, the East Baltic, northeast Poland and Podolia—commonly referred to a Baltoscandia. From the first chitinozoans in the latest Tremadoc to the latest Ashgill (a period comprising ca.
Jaak Nõlvak, Yngve Grahn
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Ordovician chitinozoan biozonation of the Brabant Massif, Belgium
Review of Palaeobotany and Palynology, 2000Chitinozoans from seven Ordovician units (Abbaye de Villers, Tribotte, Rigenée, Ittre, Bornival, and Brutia formations and a new unnamed unit, here provisionally called the Asquempont unit) belonging to the mainly concealed Brabant Massif, Belgium are described herein. Fifty-six samples were taken from rocks cropping out at the south-eastern rim of the
J, Samuelsson, J, Verniers
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Ordovician chitinozoan diversification events in China
Science in China Series D: Earth Sciences, 2004Correlative study of the Ordovician chitinozoan biostratigraphy in China with graptolite and conodont biozones, and comprehensive analysis of the sequence- and event-strati-graphic indicated that 17 chitinozoan zones and 5 main chitinozoan diversification events subsequently occurring could be recognized in the Ordovician System of China.
Xiaofeng Wang, Xiaohong Chen
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Emergence, biodiversification and extinction of the chitinozoan group
Geological Magazine, 2010AbstractChitinozoans are considered as reproductive bodies of marine invertebrates, called chitinozoophorans. These chitinozoophorans were most likely to have been small, pelagic or necto-pelagic, soft-bodied, probably wormlike animals, and judging from the size of chitinozoans, they probably measured from a few millimetres to a few centimetres in ...
YNGVE GRAHN, FLORENTIN PARIS
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Ultrastructural studies of some chitinozoan vesicles
Lethaia, 1980Four species of Ordovician Chitinozoa from Oland, Sweden, Cyathochitina stentor, Desmochitina minor, Lagenochitina esthonica, and Lagenochitina tumida, have been investigated by transmission electron microscopy. There is very great variation in the vesicle wall ultrastructure of the specimens studied.
Yngve Grahn, Björn A. Afzelius
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