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A glacial period (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 between glacial periods. The Last Glacial Period ended about 15,000 years ago. [1]
The categorisation of the past into discrete, quantified named blocks of time is called periodization. [1] This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept).
500 million years of climate change Ice core data for the past 400,000 years, with the present at right. Note length of glacial cycles averages ~100,000 years. Blue curve is temperature, green curve is CO 2, and red curve is windblown glacial dust (loess). Scale: Millions of years before present, earlier dates approximate.
An interglacial period (or alternatively interglacial, interglaciation) is a geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods within an ice age. The current Holocene interglacial began at the end of the Pleistocene, about 11,700 years ago.
Date ranges of classical music eras are therefore somewhat arbitrary, and are only intended as approximate guides. Scholars of music history do not agree on the start and end dates, and in many cases disagree whether particular years should be chosen at all. The 20th century has exact dates, but is strictly a calendar based unit of time.
Last Glacial Period, the most recent glacial period (115,000 to 11,700 years ago) Penultimate Glacial Period, the glacial period that occurred before the Last Glacial Period; Late Cenozoic Ice Age, the geologic period of the last 33.9 million years; Little Ice Age, a period of relative cold in certain regions from roughly 1450–1480
The table of years in music is a tabular display of all years in music, to provide an overview and quick navigation to any year. Contents: 1300s – 1400s – 1500s – 1600s – 1700s – 1800s – 1900s – 2000s – Other
Musical era (or period) – distinct time frame in the history of music characterized by specific styles, practices, and conventions. Each period reflects the cultural, social, and political contexts of its time. The following is an overview of the stylistic movements within each period.