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Wallodinium cylindricum and "Wallodinium elongatum": stratigraphical problem and taxonomical solution
Abstract
Morphological analysis of well-preserved Early and Middle Jurassic (Germany, Switzerland, England) and Early Cretaceous material (France, England) allowed to distinguish and to redefine, among a group of superficially similar forms which often have been mixed up in the literature, the following four species: Wallodinium cylindricum (Habib, 1970) Duxbury, 1983 n. emend., Wallodinium laganum n.sp., Andreedinium (formerly Wallodinium) elongatum (Beju, 1971) Feist-Burkhardt & Monteil in Feist-Burkhardt 1990 emend., and Andreedinium aff. elongatum. The dinoflagellate affinities of these taxa are demonstrated by these new observations. The recognition of these four distinct taxa increases the stratigraphical resolving power in the Jurassic and Cretaceous.
... This zone correlates with Assemblage Zone C in Lund & Pedersen (1985) and the assemblage found in sample B2/57 at approximately 460 m in Primulaelv by Underhill & Partington (1994). The dinoflagellate cyst Wallodinium laganum appears for the first time in this zone and is only known from the Late Toarcian Levesquei Zone in northern Germany and England (Feist-Burkhardt & Monteil 1994). The ammonite Dactylioceras sp. ...
... Wallodinium laganum Burkhardt & Monteil 1994 (Plate 5, fig. 6) W. spp. ...
The Neill Klinter Group of Jameson Land, East Greenland contains rich and diverse palynomorph assemblages. Spores, pollen and freshwater algae dominate most of the samples, but dinofla- gellate cysts and acritarchs also form important components. The ages suggested by the paly- nomorphs from the Rævekløft, Gule Horn and Ostreaelv Formations span the period from the Early Pliensbachian to the early Aalenian. The number of palynomorphs identified totals 136, including 83 miospore and 53 microplankton species; they are grouped into seven palynologi- cal assemblage zones. In general, there is good agreement between the palynological and sedimentological data, and the palynological data has refined the understanding of the depositional palaeoenvironments of the Neill Klinter Group. In some cases, the boundaries of the palynological assemblage zones are congruent with major sequence stratigraphic surfaces and the palynological data thus sup- port the sequence stratigraphic interpretation. In other cases, however, regional correlation indi- cates that the zone boundaries cross important sequence stratigraphic surfaces, such as sequence boundaries; such behaviour is thought to reflect the facies-dependent nature of certain of the palynological assemblage zones. The pattern of palynological events in East Greenland has also been recognised on the mid-Norwegian shelf.
This contribution documents the palynology of nineteen core samples. The borehole was drilled to provide an additional reference section for the nearby clay pit, which has been proposed as a possible Global Stratotype Section and Point (GSSP) for the base of the Aalenian Stage (Middle Jurassic). The aims of this work are to determine the palynostratigraphy of both indigenous marine and terrestrially-derived forms over the Toarcian-Aalenian transition and to effect comparisons of the palynofloras with ammonite faunas. The stage transition in the borehole is marked by a sequence of five palynomorph bioevents: two dinoflagellate cyst inceptions, one sporomorph inception and two dinoflagellate cyst acme bioevents, within the upper-most Toarcian Pleydellia aalensis ammonite Zone. Certain of these palynomorph bioevents are of widespread biostratigraphical utility. Variations in abundance trends of selected dinoflagellate cyst and sporomorph taxa appear to be characteristic of the Toarcian-Aalenian boundary. The previously undescribed dinoflagellate cysts Nannoceratopsis gracilis subsp. superba n. subsp. and Wittnaudinium minutum n. g. n. sp. are formalised herein.
Zusammenfassung: Beim Bau der ICE-Trasse Hannover-Berlin ergaben sich östlich von Braunschweig
mehrere temporäre Aufschlüsse, die im Rahmen der stratigraphischen Landesaufnahme beprobt und mikropaläontologisch
und palynologisch untersucht wurden. Für die beiden im Bereich des „Polyplocus-Sandsteins“
vermuteten Teilprofile (Profil 1.2 und Profil 3b) werden die Ergebnisse vorgestellt. Sie erlauben die
biostratigraphische Einstufung des Sandsteins in das Aalenium.
Abstract: A series of temporary outcrops east of Braunschweig was created during construction work for the
Intercity-Express (ICE) new railway line between Hannover and Berlin. These outcrops were studied by the
Geological Survey of Lower Saxony for stratigraphical purposes. We report here on the micropalaeontological
and palynological results in the two sections 1.2 and 3b. By using the combination of micropalaeontology
and palynology we are able to provide a better age constraint and confirm a previously suggested Aalenian
age of the so-called “Polyplocus sandstone”.
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