The flat disk-shaped calcareous shell of a foraminifer, found commonly as a fossil up to 8 cm across in marine Tertiary deposits.
- ‘Well-rounded clasts include lava, volcaniclastic sandstones and bioclastic limestones with nummulites, bryozoa, microbial carbonate and bivalve material.’
- ‘In the seas, the calcareous nannofossils were still in evidence but in shallow waters the benthonic nummulite and other larger foraminifera became very abundant.’
- ‘They found that the Eocene nummulites lived in nutrient-rich environments during a warm climatic phase.’
- ‘The occurrence higher in the succession of nummulites and neritic fossils indicates overall shallowing upwards.’
Early 19th century: from Latin nummulus (diminutive of nummus coin) + -ite.