Kai Ingemann Schnetler
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New monography on the molluscan fauna in boulders of Kerteminde Marl (Selandian, Early Paleocene) in a gravel-pit at Gundstrup (Funen, Denmark)

The fauna contains 133 mollusc species, of which 27 are new.

 

Aporrhais gracilis and Drepanocheilus koeneni

Kangilioptera gundstrupensis and Quadrinervus wienekei

Schnetler, K.I. & Nielsen, M.S. 2018: A Palaeocene (Selandian) molluscan fauna from boulders of Kerteminde Marl in the gravel-pit at Gundstrup, Fyn, Denmark. Cainozoic Research 18(1), pp. 3-81. June 2018.

 

Spiniloma faxensis, a unique gastropod species from corallian chalk at Faxe (Danian)

The specimen was pictured in Damholt & Rasmussen (2010) and first presumed to be a Muricid. However, further studies resulted in an assignment to the subfamily Spinilomatinae of the family Spinilomatidae, which was distributed during the Jurassic and Cretaceous.

The only known specimen is preserved as an external impression in corallian chalk and a mould in silicone rubber shows the long spines and the fine spiral ornament. The species was named Spiniloma? faxensis after the type locality Faxe quarry and was published April 2017 in Bulletin of the Geological Society of Denmark (Dansk Geologisk Forening).

Damholt, T., Rasmusssen, A. & Rasmussen, L. 2010: Fossiler fra Faxe Kalkbrud. 2. oplag. Revideret udgave. Geomuseum Faxe. 48 pp.

Schnetler, K.I., & Milàn, J., 2017: A new Cenozoic record of spinilomatine aporrhaids (Stromboidea, Caenogastropoda) in the early Paleocene of Faxe, Denmark.
© 2017 by Bulletin of the Geological Society of Denmark, Vol. 65, pp. 37-45. ISSN 2245-7070. www.2dgf/publikationer/bulletin

 

The Catalogue of the gastropods from the Baunekule facies (nose-limestone)

Lauridsen, B.W. & Schnetler, K.I. 2014. A catalogue of Danian gastropods from Baunekule facies. Geological Survey of Denmark and Greenland Bulletin 32, 117 pp.

Abstract

The present catalogue of 194 gastropod taxa is based on the Danian collection of gastropods from the Baunekule facies, Faxe Formation in eastern Denmark. The gastropod fauna is extremely rich and well preserved. Most of the gastropods (106 species) are referred to genus level only, 9 morphotypes to even higher taxonomical levels and 79 gastropods are referred to species level. The gastropods are classified following Bouchet & Rocroi (2005) as 4 different clades: Vetigastropoda (represented by 26 species and 10 superfamilies); Caenogastropoda (represented by 142 species and 17 superfamilies); Heterobranchia (represented by 23 species and 5 superfamilies) and Opisthobranchia (represented by 1 species and 1 superfamily). The new species Zaclys? nuetzeli n. sp. is introduced.

The Faxe Formation is recognized as a cold-water coral ecosystem with interfingering smaller bryozoan mounds. The Baunekule facies is found in the upper part of the coral mound complex of the Faxe Formation, where it forms isolated lensoidal bodies in the flanks of some of the coral mounds. It is characterized by a high diversity invertebrate fauna set in weakly consolidated coral-dominated floatstone to rudstone. The diagenesis of the Baunekule facies is of special significance because a high proportion of the originally aragonite-shelled fauna is preserved by recrystallization to calcite during early burial diagenesis. Most of the gastropods are not known from other parts of the Faxe Fm. The fauna is very important for evolutionary comparative studies of the fossil and modern gastropods on cold-water coral mounds. Many of the genera were not known from Danian strata before. No gastropod species found in the Baunekule facies are known for certain to have passed the K/Pg boundary. The fauna is comparable to gastropods found on modern cold-water coral mounds in the North Atlantic.

The gastropod fauna from Baunekule facies is characterized by a very high diversity of rather small millimeter sized gastropods having a preference for hard substrate and with more than 63.9% belonging to the browsing carnivore trophic group feeding mainly on sedentary animals. Surprisingly, the fauna contains some common occurrence of typically warm water species. The fauna consists mostly of Cenozoic genera and up to 87% of the species could be endemic to the cold-water coral ecosystem of the Faxe Fm. The diverse and rather unusual gastropod fauna from Baunekule facies is undoubtly linked to the evolution of cold-water coral ecosystems.

A full-text pdf can be downloaded from the website of GEUS on this link: http://www.geus.dk/UK/publications/geol-survey-dk-gl-bull/32/Pages/default.aspx