nummulite

/nuhm-yuh-lahyt/US // ˈnʌm yəˌlaɪt //UK // (ˈnʌmjʊˌlaɪt) //

木棉花,木鱼石,木棉石,木棉岩

Definitions

n.名词 noun

1
- : a fossil foraminifer of the genus Camerina, having a calcareous, usually disklike shell.

The nummulite limestone was undoubtedly oceanic, and the other shells contained in it are marine species.
The Eocene includes a series of sandstones and marls with lignite, and these are overlaid by nummulite limestones.
The beds are also sometimes named Nummulite limestone, Miliolite limestone, and Cerithium limestone.
In a stratum just above these are numbers of a large Nummulite (Nummulites lævigatus).
The tertiary nummulite limestone, so abundant in Egypt, has not hitherto been met with in Nubia.