| 单词 | Paleozoic |
| 例句 | Sometimes too you will see the term Phanerozoic used to describe the span encompassing the Cenozoic, Mesozoic, and Paleozoic eras. A Short History of Nearly Everything 2003-05-06T00:00:00Z This happened around 600 million years ago, at the beginning of the Paleozoic era, and accounts for the sudden abundance of marine fossils of all kinds in the record of this period. The Lives of a Cell 1974-01-01T00:00:00Z The region was covered by warm, shallow seas back in the Precambrian and Paleozoic eras, which is why we found plenty of fossils in the creek bed. This 414-mile road to the Arctic Ocean is one of the world’s most remote highways 2016-04-07T04:00:00Z Sonically, the song is classic Tribe, built on beats and groove and a Paleozoic sample from an Andrew Hill Blue Note record. Review | A true fan offers a riveting tribute to A Tribe Called Quest 2019-01-25T05:00:00Z Both tried to parse the technology from 1999, a Paleozoic era in terms of cellphones. ‘Serial’ takes the stand: How a podcast became a character in its own narrative 2016-02-08T05:00:00Z The images also depict planned attractions that were never realized, including a Paleozoic Museum in Central Park. 19th-Century Parks Drawings for New York City Are Destined for Display 2015-11-12T05:00:00Z The final meal of this animal—a trilobite—still sat in its guts as sediment buried its body in the sea floor of an ancient Paleozoic sea. Scientists reveal half-billion-year-old ‘last supper’ 2023-09-27T04:00:00Z The early era, known as the Paleozoic, is divided into six periods. Fundamentals of Biology 2015-01-01T00:00:00Z The Paleozoic strata of the Rockies also include Ordovician, Devonian, Carboniferous, and Permian sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z The Paleozoic era was dominated by marine organisms, but by the middle of the era, plants and animals had evolved to live and reproduce on land, including amphibians and reptiles. An Introduction to Geology 2017-01-01T00:00:00Z But this trove of trilobite fossils has revealed frustratingly little when it comes to how the Paleozoic animals reproduced across 250 million years of living on ancient Earth. Before There Were Birds or Bees, This Is How Trilobites Made Babies 2022-05-06T04:00:00Z Major often finds himself awed by crystals — an amateur geologist pondering how many millions of years ago magma cooled slowly to form pockets of interlocking quartz inside Paleozoic sandstone. How to Collect Crystals 2021-08-31T04:00:00Z Fossilized cells, cuticles, and spores of early land plants have been dated as far back as the Ordovician period in the early Paleozoic era. Fundamentals of Biology 2015-01-01T00:00:00Z By way of example, a schematic cross- section through the Paleozoic and Mesozoic rocks of southern Manitoba is given in Figure 21.10. 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 Geologists like to say that New Jersey’s coastal plain sits “unconformably” atop this Paleozoic base. The Long, Slow Drowning of the New Jersey Shore 2021-08-12T04:00:00Z The carbonates in the outcroppings date back 541 million years to the Paleozoic era, according to the U.S. Scientists expected thawing wetlands in Siberia’s permafrost. What they found is ‘much more dangerous.’ 2021-08-02T04:00:00Z As the Paleozoic progressed, glaciations created a cool global climate, but conditions warmed near the end of the first half of the Paleozoic. Fundamentals of Biology 2015-01-01T00:00:00Z The section extends from the Saskatchewan-Manitoba border on the left to just east of Winnipeg on the right, and shows the Paleozoic rocks overlain on the rocks of the Precambrian Superior Craton. Physical Geology 2015-01-01T00:00:00Z Tectonics in western North America during the early part of the Paleozoic was mostly mild, as a long-lived passive margin developed. An Introduction to Geology 2017-01-01T00:00:00Z During the Paleozoic, about 400 million years ago, there was a final major increase in atmospheric oxygen. ‘Totally new’ idea suggests longer days on early Earth set stage for complex life 2021-08-02T04:00:00Z "The period that they existed from was between 500 and 251 million years ago, the Paleozoic Era," he said. Walsall boy, 6, finds prehistoric fossil in garden 2021-03-28T04:00:00Z During the latter half of the Paleozoic, the landmasses began moving together, with the initial formation of a large northern block called Laurasia. Fundamentals of Biology 2015-01-01T00:00:00Z Fifteen different Paleozoic formations, ranging in age from Ordovician to Carboniferous, are shown in Figure 21.10. Physical Geology 2015-01-01T00:00:00Z The earliest Paleozoic had a significant biological explosion and contains evidence of a wide variety of evolutionary paths, including the evolutionary invention of hard parts like shells, spikes, teeth, and scales. An Introduction to Geology 2017-01-01T00:00:00Z Reevaluation of the largest published morphological data matrix for phylogenetic analysis of Paleozoic limbed vertebrates. The Microsaurs of Yore 2017-07-08T04:00:00Z In 2013, Snelling applied for a permit to study the folding of Paleozoic sedimentary structures at four locations within the Grand Canyon. Creationist geologist sues U.S. park service after it rejects request to collect samples in Grand Canyon 2017-05-19T04:00:00Z Eventually, a single supercontinent, called Pangaea, was formed, starting in the latter third of the Paleozoic. Fundamentals of Biology 2015-01-01T00:00:00Z Figure 21.10 The Paleozoic sedimentary rocks of southern Manitoba along a section extending from the Saskatchewan border on the left to the Winnipeg area on the right. Physical Geology 2015-01-01T00:00:00Z Mammals, as previously mentioned, got their start from a reptilian synapsid ancestor possibly in the late Paleozoic. An Introduction to Geology 2017-01-01T00:00:00Z I’m talking about the microsaurs, an extinct Paleozoic group, conventionally put somewhere within that gargantuan assemblage of lineages termed ‘amphibians’. The Microsaurs of Yore 2017-07-08T04:00:00Z Trilobites—three-sectioned, crablike critters that dominated the early Paleozoic—are so abundant that they have become the gateway fossil for most collectors. Ancient trilobites may have released sperm and eggs from their heads 2017-02-23T05:00:00Z During the early Paleozoic, the amount of carbon dioxide in the atmosphere was much greater than it is today. Fundamentals of Biology 2015-01-01T00:00:00Z There are Paleozoic rocks in the central and western parts of British Columbia and Yukon, but they formed far away and did not become part of North America until the Mesozoic. Physical Geology 2015-01-01T00:00:00Z The rocks are Permian in age and formed in the desert conditions that dominated North America toward the end of the Paleozoic through the middle Mesozoic. An Introduction to Geology 2017-01-01T00:00:00Z A spin through the digital data reveals that the sculpture was carved from a single block of gray limestone, originally formed during the Paleozoic Era, at least 252 million years ago. A modern look at ancient, spiritual work 2016-05-04T04:00:00Z Crinoids are relatives of urchins and sea stars and were once quite numerous in the ancient oceans of the Paleozoic 550 to 250 million years ago. Alien Animals and Tortured Seascapes off the Galápagos 2015-07-20T04:00:00Z As plants became more common through the latter half of the Paleozoic, microclimates began to emerge and ecosystems began to change. Fundamentals of Biology 2015-01-01T00:00:00Z Most of the Paleozoic rocks in this basin, which range in age up to the Carboniferous, have marine affinities, although there are important evaporites as well. Physical Geology 2015-01-01T00:00:00Z Paleontologists refer to this event as the Cambrian Explosion, named after the first period in the Paleozoic. An Introduction to Geology 2017-01-01T00:00:00Z A slice of Indian crust, topped by Paleozoic and Mesozoic sediments that had been deposited on the continental shelf, was thrust up onto the oncoming subcontinent. How The Deadly Nepal Earthquake Happened [Infographic] 2015-04-27T04:00:00Z Crinoids are relatives of urchins and sea stars and were once quite numerous in the ancient oceans of the Paleozoic 550 to 250 million years ago. Alien Animals and Tortured Seascapes off the Galápagos 2015-07-20T04:00:00Z The late Paleozoic was a time of diversification of vertebrates, as amniotes emerged and became two different lines that gave rise, on one hand, to mammals, and, on the other hand, to reptiles and birds. Fundamentals of Biology 2015-01-01T00:00:00Z Subduction started along the western edge of Laurentia by the middle Paleozoic. Physical Geology 2015-01-01T00:00:00Z The end of the Paleozoic era is marked by the largest mass extinction in earth history. An Introduction to Geology 2017-01-01T00:00:00Z The two uplifted slices make up the bulk of the Himalayas; many of the peaks are capped by Paleozoic sediments. How The Deadly Nepal Earthquake Happened [Infographic] 2015-04-27T04:00:00Z Crinoids are relatives of urchins and sea stars and were once quite numerous in the ancient oceans of the Paleozoic 550 to 250 million years ago. Alien Animals and Tortured Seascapes off the Galápagos 2015-07-20T04:00:00Z They appeared in the Paleozoic period and were the dominant plant life during the Mesozoic. Fundamentals of Biology 2015-01-01T00:00:00Z While doing his work, he had many opportunities to look at the Paleozoic and Mesozoic sedimentary rocks of the region, and he did so in a way that few had done before. Physical Geology 2015-01-01T00:00:00Z The Paleozoic era had two smaller mass extinctions, but these were not as large as the Permian Mass Extinction, also known as the Permian-Triassic Extinction Event. An Introduction to Geology 2017-01-01T00:00:00Z They evolved in the Permian at the end of the Paleozoic some 250 million years ago. Are Cycads Social Plants? 2013-10-17T02:45:06.783Z What they did not see in either trench were any trilobites, fascinating armored and calcite-lensed creatures that dominated Paleozoic oceans, and have long been thought extinct. What Lives at the Bottom of the Mariana Trench? More Than You Might Think 2013-04-15T00:15:05.547Z While animal diversity increased during the Cambrian period of the Paleozoic era, 530 million years ago, modern fossil evidence suggests that primitive animal species existed much earlier. Fundamentals of Biology 2015-01-01T00:00:00Z 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 The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. An Introduction to Geology 2017-01-01T00:00:00Z A genus of fossil univalve shells, believed to belong to the Heteropoda, peculiar to the Paleozoic age. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z This is a lowland region of ancient Paleozoic rocks. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 8 "Hudson River" to "Hurstmonceaux" 2012-02-24T03:00:27.173Z This reduced the levels of carbon dioxide and increased the levels of oxygen in the atmosphere, so that by the end of the Paleozoic, atmospheric conditions were similar to those of today. Fundamentals of Biology 2015-01-01T00:00:00Z 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 Paleozoic means ancient life, and organisms of this era included invertebrate animals, fish, amphibians, and reptiles. An Introduction to Geology 2017-01-01T00:00:00Z The aggregate thickness of the Paleozoic beds in the region, as first deposited, was probably not less than 1,500 feet, and it may have been much more. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z This is a region of ancient and metamorphic Paleozoic rocks on the eastern side, and mainly Triassic rocks on the west. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 8 "Hudson River" to "Hurstmonceaux" 2012-02-24T03:00:27.173Z The mountains are composed in great part of Paleozoic strata, often modified by vulcanism and greatly denuded and sculptured by wind and water erosion. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 4 "Grasshopper" to "Greek Language" 2011-11-28T03:00:19.517Z The belt must have been still wider when Gondwana Land was large, as it is believed to have been during the Paleozoic era and the early Mesozoic. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Thus, in spite of minor differences, the above list shows that there are numerous and detailed similarities between Anura and Urodela with respect to the features in which they differ from the Paleozoic orders. The Ancestry of Modern Amphibia: A Review of the Evidence 2011-09-10T02:00:27.077Z Time involved.—Though it cannot be reduced to numerical terms, the time involved in the deposition of these several formations of the Paleozoic must have been very long. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z But mark my words: we’re in the Paleozoic era of consumer technology. State of the Art: Two New E-Readers Move the Plot Forward 2011-06-08T16:50:05Z In places on the top of the block, at the head of Death and Avalanche Canyons, for example, are seen the inclined layers of limestone, quartzite, and shale belonging to the less ancient Paleozoic era. Grand Teton [Wyoming] National Park 2011-05-19T02:00:05.867Z Hence there have been less radical departures from the present distribution during the relatively recent Cenozoic era than in the ancient Paleozoic because the submergence of continental areas has become less general and less frequent. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Turning to the Paleozoic Amphibia, there are two groups in which some likelihood of a relationship with modern order exists. The Ancestry of Modern Amphibia: A Review of the Evidence 2011-09-10T02:00:27.077Z If the land of southern Wisconsin remained low for a time after the uplift which brought the Paleozoic sedimentation to a close, weathering would have exceeded transportation and corrasion. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z All of this is clear evidence that the clunky primitiveness of the Paleozoic e-book era is finally drawing to a close. State of the Art: Two New E-Readers Move the Plot Forward 2011-06-08T16:50:05Z The Tennessee limestones referred to are of Paleozoic age; in Florida porous rocks, known as coquina, composed of imperfectly consolidated shells of living species of molluscs, are used in the construction of buildings. North America 2011-05-05T02:00:20.027Z Indeed, as in North America, the submergence has decreased on the average since the Paleozoic era. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z In fact, it appears that very few of the Paleozoic Amphibia were successful in establishing themselves as terrestrial animals even as adults. The Ancestry of Modern Amphibia: A Review of the Evidence 2011-09-10T02:00:27.077Z It is not known whether the lands of central Wisconsin rose to slight or to great heights at the close of the period of Paleozoic sedimentation. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Paleozoic means "ancient life;" Mesozoic, "middle life;" Cenozoic, "recent life." Famous Men of Science 2011-03-08T03:00:49.717Z Marine alg� were present, however, so that it cannot be affirmed that the hydrocarbon of the earlier Paleozoic rocks came entirely from animal organisms. North America 2011-05-05T02:00:20.027Z Subsequently, in the late Paleozoic a significant range stood where the Ouachitas now are. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z It is very pleasant to know where the Paleozoic has faulted, and how; or why the stratifications of the ice age do not show glacial scorings in certain New England localities. The Westerners 2011-02-14T03:00:39.347Z Being much harder than the Paleozoic rocks, the quartzite ridges again came to stand out as prominent ridges, as the surrounding beds of relatively slight resistance were worn away. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z The Paleozoic sediments, ranging in age from Cambrian to Permian, occupy the Great Valley, the Valley Ridges and the plateaus still farther west. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 "Apollodorus" to "Aral" The oldest known reservoirs still charged with these substances that have been discovered occur in the earlier Paleozoic rocks, just above the formations containing the oldest known fauna. North America 2011-05-05T02:00:20.027Z 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 Cambrian , the first period of the Paleozoic era,—that of the first abundance of marine animals. Unexplored! The uplift following the period of Paleozoic deposition in south central Wisconsin, inaugurated a period of erosion which, with some interruptions, has continued to the present day. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z This is called the "Paleozoic" period, which means the period of "ancient life." Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. The next great step was the crumpling into folds and upheaval of the rocks in the Appalachian region at the close of the Paleozoic era. North America 2011-05-05T02:00:20.027Z In view of the fact that rocks of Paleozoic age cover much smaller areas than do those of later age, the three Paleozoic glaciations seem to indicate a relative frequency of glaciation. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z "The glory and the dream" come, not from another world, but from the Paleozoic period, in which existed the most ancient forms of life of which traces still remain. The Scrap Book. Volume 1, No. 2 April 1906 It was filled when the sediments of that formation were laid down, to be again opened, and perhaps deepened, in the period of erosion which followed the deposition of the Paleozoic series. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Coal is found laid down in great veins, varying in thickness, in various parts of the world in the upper strata of the Paleozoic period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. The Paleozoic era witnessed the first appearance of vertebrate life. North America 2011-05-05T02:00:20.027Z Here batholiths of granite have been intruded into Paleozoic slates and sandstones, and tin ores occur in fissures and stockworks in the marginal zones. The Economic Aspect of Geology Progressively southward they score deeper into the strata of the earth's crust until, as they approach their climax, they break through the bottom of the Paleozoic limestone deep into the heart of the Archean gneiss. The Book of the National Parks But the desolate rock-strewn terrain stretched out before them as devoid of life as the Paleozoic Earth. A World Called Crimson All of the great chalk beds were formed ages after the coal beds, as the latter are found in the upper strata of the Paleozoic period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. The time indicated is at the close of the Paleozoic era, and after the great coal-fields extending from Pennsylvania southward to Alabama and westward to beyond the Mississippi were formed. North America 2011-05-05T02:00:20.027Z The Clinton iron ores all follow one general horizon in the lower-middle Paleozoic. The Economic Aspect of Geology They traversed plateaux that were dotted with islets of jungle, plains covered with flowers and drenched with torrential rains, misty marshes that suggested landscapes of the Paleozoic Age. Sacrifice It contains the earliest formations whose original character can be certified; it contains almost the latest known formations; and the record is unusually full, with the exception of the later Paleozoic rocks. History and Comprehensive Description of Loudoun County, Virginia Slate, like building-stone and limestone, is quarried from the earth's crust and is found in the strata close above the Metamorphic rocks, near the beginning of what is called the Primary, or Paleozoic period. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. Then the area occupied by these rocks was elevated, and around its margins were deposited successively the other members of the Paleozoic. Cave Regions of the Ozarks and Black Hills The Paleozoic seas in northern and eastern United States encroached over land areas to the north and east and deposited ordinary sediments such as sandstone, shale, and limestone. The Economic Aspect of Geology The central sea of Asia, the Tethys, extended westwards and now joined with the European Paleozoic sea; and deposits of Ordovician and Silurian age were laid down:—the Muth deposits. The Birth-Time of the World and Other Scientific Essays There is a laboratory of invertebrate paleontology of Paleozoic age, with a corps of paleontologists. Scientific American Supplement, No. 484, April 11, 1885 Paleozoic he might be, but it stung him that she should tell him so. Madcap Briefly, Paleozoic rocks make up the eastern part of the Andean Mountains in Peru, while the western range is formed of Mesozoic beds, volcanic ashes and lava of comparatively recent date. Tom Swift and His Big Tunnel, or, the Hidden City of the Andes The very large reserves of the Katanga copper belt of the Belgian Congo are in the form of tabular masses in schistose and highly metamorphosed Paleozoic sediments. The Economic Aspect of Geology Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. The Gutenberg Webster's Unabridged Dictionary Section T, U, V, and W There was no higher, more far-reaching "common good" than this to which acres prepared from Paleozoic days and consecrated of unselfish adventure could be devoted. The French in the Heart of America Hence toward the close of the Paleozoic the southern lands of the eastern hemisphere were invaded by great glaciers or perhaps by ice sheets like that which now shrouds Greenland. The Elements of Geology Chloride of gold is at present day contained in sea water and in some mineral waters, and would have been likely to be more abundant during the Azoic and early Paleozoic period. Getting Gold: a practical treatise for prospectors, miners and students The church is Norman and the intelligence of the majority of the natives Paleozoic. Something New The close of the Paleozoic was, as we have seen, a time of marked physical changes. The Elements of Geology Thus, even at the beginning of the Paleozoic, the continental plateau of North America had already been left by crustal movements in relief above the abysses of the great oceans on either side. The Elements of Geology They were still of the primitive Paleozoic types. The Elements of Geology Like those whose remains are found in the lower Paleozoic systems, all of these Devonian vertebrates were aquatic and go under the general designation of fishes. The Elements of Geology Of all groups of living fishes the sharks are the oldest and still retain most fully the embryonic characters of their Paleozoic ancestors. The Elements of Geology We have seen that during Paleozoic times a long, narrow trough of the sea lay off the western coast of the ancient land of Appalachia, where now are the Appalachian Mountains. The Elements of Geology Although the Mesozoic era is shorter than the Paleozoic, as measured by the thickness of their strata, yet its duration must be reckoned in millions of years. The Elements of Geology At the same time ranges were upridged out of thick Paleozoic sediments both in the Bay of Fundy region and in the Indian Territory. The Elements of Geology The sedimentary record of the Paleozoic was closed, and after an unknown lapse of time, here unrecorded, the annals of the succeeding era were written under changed conditions. The Elements of Geology The Paleozoic insects were generalized types connecting the present orders. The Elements of Geology Evidently the lands within the Arctic Circle enjoyed a warm and genial climate, as they had done during the Paleozoic. The Elements of Geology Volcanic action, which had been remarkably absent in eastern North America during Paleozoic times, was well-marked in connection with the warping now in progress. The Elements of Geology The deformation therefore took place about the close of the Paleozoic. The Elements of Geology The blastoids became more abundant in the Devonian, culminated in the Carboniferous, and disappeared at the end of the Paleozoic. The Elements of Geology Paleozoic time, although shorter than the pre-Cambrian as measured by the thickness of the strata, must still be reckoned in millions of years. The Elements of Geology It is according to the successive stages in the advance of life that the Paleozoic formations are arranged in five systems,—the CAMBRIAN, the ORDOVICIAN, the SILURIAN, the DEVONIAN, and the CARBONIFEROUS. The Elements of Geology Thus the brachiopods, a type of shellfish, have made no progress since the Paleozoic, and some of their earliest known genera are represented by living forms hardly to be distinguished from their ancient ancestors. The Elements of Geology In western North America the closing stages of the Paleozoic were marked by important oscillations. The Elements of Geology The formation of flat-lying sandstone which covers this buried land surface is proved by its fossils to belong to the Cambrian,—the earliest period of the Paleozoic era. The Elements of Geology |
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