Information about Interglacial
An Interglacial is a geological interval of warmer global average temperature that separates glacials, or ice ages. The current Holocene interglacial has persisted since the Pleistocene, about 11,400 years ago.
During the interglacials, which we are in right now, the climate warmed to more or less present day temperatures and the tundra receded to the north following the ice sheets. Forests returned to areas that once supported the tundra vegetation. Essentially and traditionally, interglacials are identified on land or in shallow epicontinental seas, that is: not in the ocean. Mostly, they are recognized by their paleontology. Floral and faunal remains of species pointing to temperate climate and indicating a specific age are used to identify particular interglacials. Most used are mammalian and molluscan species, pollen and plant macro-remains (seeds and fruits). However, many other fossil remains may be helpful: insects, ostracods, foraminifera, diatoms, etc.
Interglacials are a useful tool for geological mapping and also for anthropologists, as they can be used as a dating method for hominid fossils. [1].
Brief periods of milder climate that occurred during the last glacial are called interstadials. Most (not all) interstadials are shorter than interglacials. Interstadial climate may have been relatively warm but this is not necessarily so. Because the colder periods (stadials) have often been very dry, wetter (so not necessarily warmer) periods have been registrated in the sedimentary record as interstadials as well.
The oxygen isotope ratio obtained from deep sea cores and a proxy for average global temperature, is an important source of information about changes in the climate of the earth.
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A hominid is any member of the biological family Hominidae (the "great apes"), including the extinct and extant humans, chimpanzees, gorillas, and orangutans.
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Interglacials during the Pleistocene
During the 2.5 million year span of the Pleistocene, numerous glacials, or significant advances of continental ice sheets in North America and Europe occurred at intervals of approximately 40,000 to 100,000 years. These glacial periods were separated by more temperate interglacials.During the interglacials, which we are in right now, the climate warmed to more or less present day temperatures and the tundra receded to the north following the ice sheets. Forests returned to areas that once supported the tundra vegetation. Essentially and traditionally, interglacials are identified on land or in shallow epicontinental seas, that is: not in the ocean. Mostly, they are recognized by their paleontology. Floral and faunal remains of species pointing to temperate climate and indicating a specific age are used to identify particular interglacials. Most used are mammalian and molluscan species, pollen and plant macro-remains (seeds and fruits). However, many other fossil remains may be helpful: insects, ostracods, foraminifera, diatoms, etc.
Interglacials are a useful tool for geological mapping and also for anthropologists, as they can be used as a dating method for hominid fossils. [1].
Brief periods of milder climate that occurred during the last glacial are called interstadials. Most (not all) interstadials are shorter than interglacials. Interstadial climate may have been relatively warm but this is not necessarily so. Because the colder periods (stadials) have often been very dry, wetter (so not necessarily warmer) periods have been registrated in the sedimentary record as interstadials as well.
The oxygen isotope ratio obtained from deep sea cores and a proxy for average global temperature, is an important source of information about changes in the climate of the earth.
References
ice age is a period of long-term reduction in the temperature of Earth's climate, resulting in an expansion of the continental ice sheets, polar ice sheets and mountain glaciers.
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Pleistocene epoch (IPA: /'plaɪstəsi:n/) on the geologic timescale is the period from 1,808,000 to 11,550 years BP. The Pleistocene epoch had been intended to cover the world's recent period of repeated glaciations.
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Pleistocene epoch (IPA: /'plaɪstəsi:n/) on the geologic timescale is the period from 1,808,000 to 11,550 years BP. The Pleistocene epoch had been intended to cover the world's recent period of repeated glaciations.
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For the book by Robert J. Sawyer, see .
A hominid is any member of the biological family Hominidae (the "great apes"), including the extinct and extant humans, chimpanzees, gorillas, and orangutans.
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Oxygen isotope ratio cycles are cyclical variations in the ratio of the mass of oxygen with an atomic weight of 18 to the mass of oxygen with an atomic weight of 16 present in calcite of the oceanic floor as determined by core samples.
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