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单词 Proterozoic
例句 Proterozoic
Others divide the Precambrian into two eras, the very ancient Archean and the more recent Proterozoic. A Short History of Nearly Everything 2003-05-06T00:00:00Z
The late Proterozoic “Snowball Earth” glaciations were thought to be sufficiently intense to affect the entire planet. Physical Geology 2015-01-01T00:00:00Z
By the Proterozoic eon, lithospheric plates had formed and started moving according to plate tectonic motions similar to today. An Introduction to Geology 2017-01-01T00:00:00Z
The microscopic fossils, contained in shale rock from the Northwest Territories of Canada, dated to the Proterozoic era before the advent of complex life forms. Old mold: Fossil of world's earliest fungus unearthed in Canada 2019-05-22T04:00:00Z
The Proterozoic—the geologic eon that preceded the Cambrian period and spanned the time from the appearance of oxygen in Earth’s atmosphere to the emergence of complex life—is itself nearly two billion years long. Did Crawling Critters Leave These Cracks? The Answer Could Rewrite Evolutionary History 2019-02-26T05:00:00Z
Back in the Proterozoic, a few million years after multicellular life appeared on the planet, the moon was about 211,825 miles away from Earth—about 21,000 miles closer than it is today. This Summer Solstice, Earth's Days Are Longer Than Ever 2018-06-20T04:00:00Z
Late in the Proterozoic, for reasons that are not fully understood, the climate cooled dramatically and Earth was seized by what appears to be its most intense glaciation. Physical Geology 2015-01-01T00:00:00Z
It formed about 1 billion years ago and broke up at the end of the Proterozoic, about 750-600 million years ago. An Introduction to Geology 2017-01-01T00:00:00Z
The rocks found beneath the small town, under examination, seem to match those found in the Laurentia, Canada, dating back to the Proterozoic Eon. Part of Australia Sits on an Ancient Piece of North America 2018-01-25T05:00:00Z
To live in the future, is to sometimes feel like little more than Proterozoic sludge. I want you to meet the nicest person on the internet 2015-04-13T04:00:00Z
Life on land in the Proterozoic: Evidence from the Torridonian rocks of northwest Scotland. Time Is Not Made to Flow in Vain: Eternity and Apocalypse in Assynt and Mars 2012-10-03T17:45:06.937Z
Deposition in this area was taking place during the late Proterozoic Snowball Earth glaciations, as can be seen in Windermere Group rocks of the Toby Formation from the area south of Cranbrook, B.C. Physical Geology 2015-01-01T00:00:00Z
However, during the Proterozoic, a large evolutionary step occurred with the appearance of eukaryotes. An Introduction to Geology 2017-01-01T00:00:00Z
Going back to the Proterozoic, it is astonishing to find that evidence of two highly developed glacial periods, and possibly four, has been discovered. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
Proterozoic , the age of invertebrate dominance, containing an early and a late ice age. Unexplored!
Proterozoic Algonkian   The first life which left a distinct record. The Book of the National Parks
The Toby Formation is unique in this area; most of the rest of the late Proterozoic clastic sedimentary rocks in this region do not have glacial dropstones. Physical Geology 2015-01-01T00:00:00Z
It is important to realize that the Proterozoic land surfaces were barren, at least of plants like grasses, trees, and animals. An Introduction to Geology 2017-01-01T00:00:00Z
Since the Indian and the African glaciations of Proterozoic times are as yet undated, we cannot be sure that they are not of the same date as the others. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
In the Proterozoic, there are two periods, viz.: the Archaean and the Algonkian. The Grand Canyon of Arizona; how to see it
This condition may have been one reason why widespread glaciation does not appear to have prevailed in high latitudes during the Proterozoic and Permian glaciations, even though it occurred farther south. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
Geological time has been divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic, and as shown in Figure 8.3, the first three of these represent almost 90% of Earth’s history. Physical Geology 2015-01-01T00:00:00Z
Since the Ediacaran fauna did not have hard parts like shells, they are not well preserved in Proterozoic rocks. An Introduction to Geology 2017-01-01T00:00:00Z
Any hypothesis of Permian and Proterozoic glaciation must explain not only the glaciation of low latitudes but the lack of glaciation and the accumulation of red desert beds in high latitudes. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
This would require that the chief source of warmth be the interior of the earth, a condition which the Proterozoic, Permian, and other widespread glaciations seem to disprove. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
He admits, however, that the stupendous thicknesses of red sandstones, quartzite, and hematitic iron ores of the later Proterozoic prove that by that date there was an abundance of atmospheric oxygen. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
The Proterozoic rocks of the Grand Canyon Group have been tilted and then eroded to a flat surface prior to deposition of the younger Paleozoic rocks. Physical Geology 2015-01-01T00:00:00Z
After the breakup of Rodinia toward the end of the Proterozoic, sea level remained high relative to land in the early Paleozoic. An Introduction to Geology 2017-01-01T00:00:00Z
Oldest known glacial period near base of Proterozoic in Canada. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
For example, they would explain such puzzling conditions as the localization and periodicity of glaciation, the formation of loess, and the occurrence of glaciation in low latitudes during Permian and Proterozoic times. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
The recent discovery of glaciation in latitudes as low as 30° in the Proterozoic is correspondingly significant. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
The difference in time between the youngest of the Proterozoic rocks and the oldest of the Paleozoic rocks is close to 300 million years. Physical Geology 2015-01-01T00:00:00Z
If they are magnified still more the result is apparently glacial epochs like those of the Pleistocene, and if they are magnified to a still greater extent, the result is Permian or Proterozoic glaciation. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
Glaciation near end of Proterozoic in Australia, Norway, and China. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
Hence, uplift alone cannot account for extensive glaciation in subtropical latitudes during the Permian and Proterozoic. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
It has been assumed by Marsden Manson and others that increased general cloudiness would account for the subtropical glaciation of the Permian and Proterozoic. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
The emission of internal heat, however, had probably ceased to be of much climatic significance near the beginning of the geological record, for in southern Canada glaciation occurred very early in the Proterozoic era. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
The thick strata of unmetamorphosed Paleozoic rocks indicate that such high temperatures have not prevailed at such slight depths since the Proterozoic. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
Toward the end of the last quarter, and hence quite recently from the geological standpoint, another period of outflows, perhaps as noteworthy as that of the Proterozoic, occurred in the Cretaceous and Tertiary. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
In the next geologic era, the Proterozoic, the researches of Walcott have shown that besides the marine algæ there must have been many other kinds of life. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
Moreover, they could live in most latitudes, for the indirect evidences of life in the Archeozoic and Proterozoic rocks are widely distributed. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
The Proterozoic fossils thus far discovered include not only microscopic radiolarians such as still form the red ooze of the deepest ocean floors, but the much more significant tubes of annelids or worms. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z
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