- The Bartonian is, in the International Commission on Stratigraphy’s (ICS) geologic time scale, a stage or age in the middle of the Eocene Epoch or Series. The Bartonian Age spans the time between 41.2 and 37.71 Ma. It is preceded by the Lutetian and is followed by the Priabonian Age.
- Self-reference (plato.standford.edu)
In the context of language, self-reference is used to denote a statement that refers to itself or its own referent. The most famous example of a self-referential sentence is the liar sentence: “This sentence is not true.”