A glacial period (or alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate within an ice age. The last glacial period ended about 15,000 years ago; The Holocene epoch is the current interglacial.
Read more about Glacial Period: Quaternary Ice Age, Last Glacial Period, Next Glacial Period
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“His singing carried me back to the period of the discovery of America ... when Europeans first encountered the simple faith of the Indian. There was, indeed, a beautiful simplicity about it; nothing of the dark and savage, only the mild and infantile. The sentiments of humility and reverence chiefly were expressed.”
—Henry David Thoreau (1817–1862)