B. Vanniel, UNUSUAL TWIN SPECIMENS OF NANNOCONUS-ABUNDANS (CALCAREOUS NANNOFOSSIL, INCERTAE-SEDIS), Journal of micropalaeontology, 14, 1995, pp. 159-164
Monospecific laminae of the species Nannoconus abundans (calcareous na
nnofossil, incertae sedis) were studied from the Munk Marl of North Je
ns-1, Danish Central Trough. These laminae contained unusual twin spec
imens which are considered to represent natural associations, rather t
han preservation artefacts.