Evolution and Development of Dual Ingestion Systems in Mammals: Notes on a New Thesis and Its Clinical Implications

Table 1

Table of geological timescales used in this paper. The nomenclature and dates are based on those in [12, 13].

Cenozoic era
Quarternary period	1.6–0 Myr
Tertiary period	66.4–1.6 Myr
Mesozoic era
Cretaceous period	144–66.4 Myr
Jurassic period	208–144 Myr
Triassic period	245–208 Myr
Paleozoic era
Permian period	286–245 Myr
Carboniferous period	360–286 Myr
Pennsylvanian (later)
Mississipian (earlier)
Devonian period	408–360 Myr
Silurian period	438–408 Myr
Ordovician period	505–438 Myr
Cambrian period	570–505 Myr