This is tha back of a framed painting. But was is alveolina?

"But the main purpose was to scrabble around amongst the unpromising, rather dirty-looking ‘gravel’ at our feet. Lentils galore! These turned out to be the single-celled foraminifera (forams) called Nummulites. They were not the cigar-shaped Alveolina that gives the basal beds of the Palaeocene Ager Group their name. Paul G. found some Alveolina further up the section on our next stop." Di Clements