We found one dictionary that defines the word quaternary periods:

General (1 matching dictionary)

1. Quaternary periods: Vocabulary.com

(Note: See quaternary_period as well.)

Definitions from WordNet (Quaternary period) ▸ noun:  last 2 million years ▸ Also see quaternary_period ▸ Words similar to quaternary periods ▸ Usage examples for quaternary periods ▸ Idioms related to quaternary periods ▸ Wikipedia articles (New!) ▸ Words that often appear near quaternary periods ▸ Rhymes of quaternary periods ▸ Invented words related to quaternary periods