1. From 40 million to 25 million years ago; appearance of sabertoothed cats
   - Oligocene epoch

Type of: epoch

Part of: Tertiary, Tertiary period

Encyclopedia: Oligocene

• hydroelectric turbine
• hydroelectricity
• hydroflumethiazide
• hydrofluoric acid
• hydrofluorocarbon
• hydrofluosilicic acid
• hydrofoil
• hydrogel
• hydrogen
• hydrogen atom
• hydrogen azide
• hydrogen bond
• hydrogen bromide
• hydrogen carbonate
• hydrogen chloride
• hydrogen cyanide
• hydrogen fluoride
• hydrogen iodide
• hydrogen ion
• hydrogen ion concentration
• hydrogen peroxide
• hydrogen sulfide
• hydrogen sulphide
• hydrogen-bomb
• hydrogenate