Late Miocene decapod faunas at Gram, Denmark R. Fraaije, J. Hansen, & T. Hansen

Decapod crustacean recognised from the upper Miocene at the Gram clay-pit, south-west Jutland, Denmark


The silty, dark, micaceous clays in the Gram clay-pit has yielded many calcareous nodules with decapod crustacean remains over the past decades. The sequence was deposited in the Late Miocene Tortonian (LAURSEN & KRISTOFFERSEN, 1999). Although decapods from Gram are present in many private and museum collections no detailed study has been undertaken until now. Extensive "bed-by-bed" sampling by two of the authors (TH, JH) (Text fig. 2) has resulted in a detailed assessment of the distribution of decapods in the sequence and the faunas
Text fig. 2 Vertical distribution of decapods in the Gam Clayput
The lithological log is modified after Stockmarr (2000)

Systematic palaeontology

Order Decapoda Latreille, 1802
Infraorder Astacidea Latreille, 1803
Superfamily Nephropoidea Dana, 1852
Family Nephropidae Dana,1852
Subfamily Nephropinae Dana,1852
Genus Nephrops Leach, 1814
Nephrops kvistgaardae Fraaije R. Hansen J. & Hansen T., 2005
Genus Homarus Weber, 1795
Homarus? cf. gammarus (Linnaeus, 1758)
Superfamily Galatheoidea Samouelle, 1819
Family Galatheidea Samouelle, 1819
Subfamily Galatheinea Samouelle, 1819
Genus Munida Leach, 1820
Munida sp.
Infraorder Brachyura Latreille, 1803
Superfamily Retroplumoidea sensu Saint Laurent, 1989
Family Retroplumidae Gill, 1894
Genus Retropluma Gill, 1894
Retropluma borealis Fraaije R. Hansen J. & Hansen T., 2005
Family Cancridae Latreille, 1803
Subfamily Lobocarcininae Beurlen, 1930
Genus Tasadia Müller in Janssen & Müller, 1984
Tasadia carniolica (Bittner, 1884)
Superfamily Portunoidea Rafinesque, 1815
Family Geryonidae Colosi, 1923
Genus Chaceon Manning & Holthuis, 1989
Chaceon miocenicus Fraaije R. Hansen J. & Hansen T., 2005


Fraaije R., Hansen J. & Hansen T.(2005) The Marine Gram Formatin at Gram, Denmark: Late Miocene Geology and Palaeontology Part 1
  in Roth F. & Hoedemakers K. Palaeontos 7, 1-189, 32 text-figs, 3 tables, 16 plates.