Applied Biostratigraphy

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==== Calpionellids ====

  * considered by Armstrong and Brasier (2005) to be related to the ciliated (possessing tiny fronds which beat in waves used for locomotion and food-gathering) Tintinnids which are in turn considered to be protozoa (animals)
  * hyaline calcareous wall (true tintinnids have organic walls and are discussed herein among the palynomorphs), generally flask shaped
  * seldom recorded as loose specimens as they are very fragile – they are normally observed in thin-section
  * geologic range: Late Tithonian (latest Jurassic) – Early Valanginian (Early Cretaceous)
  * biostratigraphically significant in the Early Cretaceous and Late Jurassic but with very few practicing specialists however relatively low numbers of species ensure that general microfossil workers can usually identify them

{{:calpionellid01.jpg?nolink|}}

//A calpionellid. These enigmatic organisms occur commonly around the Jurassic-Cretaceous boundary but in very few other time intervals.//