calpionellids
Table of Contents
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
A calpionellid. These enigmatic organisms occur commonly around the Jurassic-Cretaceous boundary but in very few other time intervals.
calpionellids.txt · Last modified: 19/03/2023 10:23 by mike_gss