When this map was constructed I classed as the newer part of the Eocene those Tertiary strata which have been described in the last chapter as Lower Miocene, and to which M. Beyrich has given the name of oligocene.
"The Student's Elements of Geology"
Sir Charles Lyell
Beyrich on term oligocene for Lower Miocene.
"The Student's Elements of Geology"
Sir Charles Lyell
oligocene, term for Lower Miocene.
"The Student's Elements of Geology"
Sir Charles Lyell