Weis R., Guérin-Franiatte S. (eds.) (2010) Le Jurassique inférieur et moyen au Luxembourg. Nouvelles données paléontologiques et biostratigraphiques // Ferrantia. Vol.62. 119 pp.
includes the following articles:
Guérin-Franiatte S., Weis R. (2010) Remarquables niveaux lumachelliques à ammonites dans le Grès de Luxembourg (Hettangien), pp.7-18
In the Luxembourg Sandstone Formation, three coquina beds have yielded an exceptional ammonite fauna: the Caloceras beds near Kopstal and near Brouch (Lower Hettangian) and the Schlotheimia beds near Brouch (Upper Hettangian). Among Caloceras, 7 species have been recognised, most of them well-known from the Paris Basin. The 12 identified species of Schlotheimia instead represent a unique diversity at the margins of the Paris Basin, and show strong affinities with the fauna of northern Germany. A few representatives of early Arietitidae are also present: Paracaloceras sp., Schreinbachites praecursor.
Guérin-Franiatte S., Maquil R., Münzberger P. (2010) Le Toarcien au Grand-Duché de Luxembourg: Biostratigraphie dans la région de Belvaux, pp.19-34
In the southern part of the Grand-Duchy of Luxembourg, a series of boreholes penetrated Toarcian sediments on more than 100m. Six lithological units were recognised. The first three, at the base of the Toarcian, proved to be particularly fossiliferous. The units have been the object of a paleontological study focussed on the ammonite fauna that allowed establishing a biostratigraphic fine scale in the Lower, Middle, and partly Upper Toarcian. It appears that the new data gathered on the eastern margin of the Paris Basin is in accordance with the well established zonal scheme in the southern part of the Basin.
Delsate D., Weis R. (2010) La Couche à Crassum (Toarcien moyen) au Luxembourg: stratigraphie et faunes de la coupe de Dudelange-Zoufftgen, pp.35-62
The stratigraphic position of the 'Couche à Crassum' in the Grand-Duchy of Luxembourg is discussed on the basis of the Dudelange-Zoufftgen section, which covers the upper part of the 'Couches à Hildoceras bifrons' (Bifrons zone) to the 'Couches à Astarte voltzi' (Variabilis-Thouarsense zones). Further outcrops from the NE margin of the Paris basin are briefly described for comparision. The 'Couche à Crassum' is characterised as a conglomeratic bed with a thickness varying from 0,1 to 1,5 m, that contains reworked ammonite faunas of the Bifrons and Variabilis zones. Changes in thickness and facies are significant even at small distance. At the Dudelange-Zoufftgen section, the sedimentation was particularly complete and two different paleontological horizons can be separated among the 'Couche à Crassum': a inferior one with Catacoeloceras crassum, Hildoceras semipolitum, H. bifrons (Bifrons subzone) and an upper one with Catacoeloceras crassum, C. raquinianum, Haugia variabilis, H. navis, Pseudolioceras compactile (Variabilis and Illustris subzones). A preliminary analysis of cephalopod (ammonites and belemnites) and shark (micro teeth) faunas provides new data on the biostratigraphic and paleogeographic distribution of these groups in the framework of the Paris basin. Isotopic, sedimentological and faunistic data indicate a warming event during the middle Toarcian (boundary Bifrons-Variabilis zones), coupled with a relatively high sea-level. These factors appear to be partially responsible for the arrival of new faunas, particularly sharks and rays, but also cephalopods.
Fuchs D., Weis R. (2010) Teudopsis bunelii Eudes-Deslongchamps, 1835 (Cephalopoda: Coleoidea) from Upper Toarcian ironstones of Luxembourg, pp. 63-71
A gladius of a coleoid cephalopod is described from the Minette Ironstone Formation (Late Toarcian, Pleydellia aalensis-Zone) of the "Haard" nature reserve near Dudelange (southern Luxembourg). Owing to growth increments, the fragmentary gladius can be attributed to Teudopsis bunelii Eudes-Deslongchamps, 1835. It is likely the worldwide first record of a cephalopod gladius from the Late Toarcian. The new record extends the stratigraphic distribution of Teudopsis bunelii from the Early Toarcian (c. 182 my) to the Late Toarcian (c. 176 my).
Guérin-Franiatte S., Weis R. (2010) Le passage Aalénien-Bajocien près de Rumelange: la série biostratigraphique dans le Bassin d'Esch-sur-Alzette (Grand-Duché de Luxembourg), pp.73-96
Paleontological field work carried out in 2002 at the Hutberg site nearby Rumelange by collaborators of the National Museum for Natural History Luxembourg has permitted to update the lithostratigraphic and biostratigraphic setting of the Aalenian-Bajocian transitional beds in the Esch-sur-Alzette ferriferous basin. The sedimentary formations outcropping at the site are stratigraphically redefined. The 21 ammonite species and sub-species recorded in situ allow assigning a detailed biostratigraphic position to the lithologic units: Staufenia sehndensis, Ludwigia murchisonae, Brasilia bradfordensis, B. falcifera, B. deleta, B. gigantea, B. similis, B. similis maubeugei, B. similis tutcheri, B. rustica, Graphoceras concavum, G. cornu, G. rudis, G. decorum, G. formosum, G. limitatum, G. aff. fallax, Reynesella piodes, R. aspera, Hyperlioceras
sp., H. desori. The faunistic inventory takes into consideration also other fossil groups, and especially the 4 belemnite species (Brevibelus breviformis, B. gingensis, Homaloteuthis murielae, Holcobelus blainvillii) who confirm the biostratigraphic data given by ammonites.
Thuy B. (2010) An early Bajocian echinoid fauna from Differdange and Pétange (Luxembourg), including a new Rhabdocidaroid species, pp. 97-114
An echinoid assemblage from the early Bajocian (Discites- to Laeviuscula-Zones) of Differdange and Pétange is described based on 13 tests and test fragments of regular echinoids, 69 spines and spine fragments and 27 tests of irregular echinoids. A total of nine species were found, one of which is described as new; these include four cidaroid species (Rhabdocidaris ehmanni n. sp., Polycidaris horrida, Paracidaris cf. zschokkei, Caenocidaris sp.), one pedinoid species (Caenopedina ferryi), one phymosomatoid species (Polydiadema depressa), one stomechinoid species (Stomechinus bigranularis) and two irregular echinoid species (Galeropygus sublaevis and Aulacopygus? sp.). The new rhabdocidarid species seems to occupy an intermediate position between the slightly older Rhabdocidaris fowleri and the more advanced
Thuy B. (2010) Note on an early Bajocian Diadematoid echinoid with attached spines and lantern from Rumelange (NE Paris Basin), pp.115-119
A crushed echinoid test with lantern and some primary spines in situ is described from the early Bajocian (Humphriesianum Zone) Nondkeil limestones of Rumelange in southern Luxembourg. The specimen is poorly preserved but there is sufficient morphological evidence to tentatively assign it to the Middle Jurassic genus Culozoma within the Aspidodiadematidae (order Diadematoida). It is the first report of adhering spines in a specimen assignable to Culozoma and confirms the presence of very long and slender primary spines in this genus.