Paleonet: The "Mysterious Microfossils" are new bugs...
granierbruno at orange.fr
Mon Mar 24 19:42:46 GMT 2008
Memoir 1 : Description and illustration of forty-four gilianelles
(microproblematica) and ten other microproblematica of the Cretaceous of the stratotype
section at Tercis (Campanian-Maastrichtian boundary), South-West France, by Gilles Serge
ODIN.- Format [HTML] or [PDF 15.672 KB] - Reference: [CG2008_M01]
IT IS AVAILABLE IN FRENCH ONLY,
Odin G.S. (2008).- Description et illustration de quarante-quatre gilianelles
(microproblematica) et de dix autres microproblematica du Crétacé de la coupe
stratotypique de Tercis (limite Campanien-Maastrichtien), Sud-Ouest France.- Carnets de
Géologie - Notebooks on Geology, Brest, Mémoire 2008/01 (CG2008_M01), 82 p., 4 figs. (ONE
VIDEO!), 16 pls.
BUT figure captions are available in both French and English, and here is the English Abstract:
Following acetolysis, microproblematica were collected from indurated carbonates sampled
from the stratotype section of the Campanian-Maastrichtian boundary at Tercis (Landes,
France). 44 taxa of the gilianelles group (microproblematica probably pertaining to the
Protista, Protozoans, Rhizopods) as well as ten other microproblematica were
discriminated. To document the taxa in this paper 281 scanning electronic microscope
images and 183 optical microscope images are presented. The gilianelles encompass 36
species, and 8 subspecies referred to 15 genera of which 14 are new. The new genera are:
Tercensella, Azymella, Numismella, Aturella, Scutellella, Corniculum, Caccabella,
Orculiella, Pennigerella, Corbella, Aquilegiella, Pocillella, Coraliella, Obbella. Among
the other microproblematica, nine species and one subspecies are proposed; they are
referred to 7 new genera: Globulella, Piperella, Vasculum, Lucernellus, Cimicellus,
Tubella, Pilella. This first general view uses normal taxonomic criteria to recognize and
define a group of microfossils of which the identity and the consistency of occurrence
are herewith established using the morphological characters of the body of the test, the
presence and development of the expansions attached to that body, and its ornamentation.
The use of these criteria in an ordered manner suggests that a rigorous taxonomic
collocation is feasible, needing only a few other observations before becoming a formal
classification. The statigraphic distribution of the taxa provides a means for
establishment of a remarkable tool for relative dating in the stratotype section and its
immediate vicinity ; microproblematica allow the sequence to be subdivided into intervals
of deposition on the order of 0.1 Ma, a length of time shorter than the intervals
obtained using the many microfossil or macrofossil groups previously employed to
calibrate the stratotype. The Campanian-Maastrichtian boundary is within the limits of
the genus Aturella lineage in the basal portion of the range of Aturella edentula.
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