In the northern Cordillera lower Paleozoic alkalic and potassic mafic magmatism is linked with rifting of the Selwyn Basin. |
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There are two main groups of fossil stromatoporoids that lived in different eras, the Paleozoic and the Mesozoic. |
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Conodonts were mostly small, elongate, eel-shaped marine animals that inhabited a variety of environments in Paleozoic and Triassic seas. |
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We acknowledge that virtually all Paleozoic calcareous foraminifers are diagenetically altered. |
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It is also highly unusual to discover these Paleozoic relics associated with decapods as they normally inhabit different environments. |
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By the end of the Paleozoic, cycads, glossopterids, primitive conifers, and ferns were spreading across the landscape. |
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They are very abundant in some Paleozoic formations and include useful index fossils. |
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Later, Spencer recognized two new orders and three new suborders for the Paleozoic families. |
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Other mature modifications, such as change in the shape of the peristome, are also inconsistently observed in Paleozoic ammonoids. |
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The early tetrapods of this time were amphibian-like animals that eventually gave rise to the reptiles and synapsids by the end of the Paleozoic. |
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In addition to the dominant Precambrian and Paleozoic rocks, there are small deposits of Mesozoic rocks on the island as well. |
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Most Paleozoic insects are known only by their wing venation since wings are the least degradable parts of insects. |
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Crinoids, together with brachiopods, dominated the Paleozoic sessile benthos. |
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This paper is the first in a series of studies re-describing echinoderm taxa from these biogeographically important Paleozoic assemblages. |
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Carbonate-rich Paleozoic bedrock characterizes the geology of the Mixedwood Plains. |
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The astragalus of diadectids is identical to those of late Paleozoic terrestrial amniotes in structure and relationship to neighboring elements. |
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Although a relatively inconspicuous component of the modern flora, the lycopsids were arborescent ecosystem dominants in the late Paleozoic. |
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An unpaired commonly enlarged interbrachial ossicle, the axillary, occurs in most Paleozoic asteroids, including those treated here. |
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Blake, Tintori, and Hagdorn and Blake and Hagdorn restudied the scanty Triassic record in light of that of the late Paleozoic. |
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The Triassic ammonoids represent the phylogenetic bridge between Paleozoic and Jurassic ammonoids. |
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Paleozoic synapsids have been the focus of many large-scale treatments over the past century and their anatomy and interrelationships are well known. |
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Many of the taxa that apparently diverged in the Paleozoic now are limpets and retain little information about the morphologies of their coiled ancestors. |
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Most Paleozoic crinoids lived attached to the sea-floor by a flexible stem, which may be either cemented to the sea-floor, or have a root-like system buried into the sediment. |
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The articulate brachiopods, which would dominate the marine environment in the later Paleozoic, were still relatively rare and not especially diverse. |
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Further, adambulacralambulacral articulation is distinct between Zoroaster and the superficially similar Paleozoic species, and ambulacral form also is distinctive. |
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Paleoproterozoic igneous and metamorphic rocks along with Paleozoic sedimentary rocks make up the basement complex of the San Juan Mountains of southwestern Colorado. |
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Cephalopods were among the most highly developed animals and the topmost predators in the free water column during long intervals of the Paleozoic. |
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Early Paleozoic land plants, land animals, and paleosols have been considered in terms of the breeder-competitor-tolerator trichotomy in nonquantitative terms. |
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Mite wood borings in the Paleozoic are primarily known from coal ball permineralizations and silicified peat which was deposited in swampy environments. |
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Many Paleozoic forms, now extinct, had very unusual morphologies. |
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Most Paleozoic insects are known only by their wing venation since wings are the least degradable parts of insects, so phylogenetic schemes will rely on venational characters. |
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At the museum, Cooper worked in contact with U.S. Geological Survey paleontologists whose concerns were brachiopods and Lower Paleozoic stratigraphy. |
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Rocks of late Precambrian and early Paleozoic age have yielded a variety of tiny spine-like fossils of dominantly organic or weakly phosphatic composition. |
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It was a fissure filling of Paleozoic, probably Permian, age. |
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Our data set includes only fossilized specimens and all of them are from an extinct genus of class Stenolaemata, the dominant Paleozoic class of bryozoans. |
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Many dendroid colonies in lower Paleozoic trepostomes developed narrow exozones of young presumably feeding autozooids in cycles that covered growing branch tips. |
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The is especially likely for earlier periods such as the Paleozoic and Proterozoic. |
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Many deformed and metamorphosed rocks, mostly of Paleozoic age, surface within the Urals. |
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Faghur North-1X logged 25 feet of net pay in the Safa and Paleozoic Desouqy sands. |
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Throughout the early Paleozoic, that landmass was broken into a substantial number of continents. |
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Geologically, the Paleozoic started shortly after the breakup of the supercontinent Pannotia. |
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The Paleozoic was a time of dramatic geological, climatic, and evolutionary change. |
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Initial diversification of macroboring ichnofossils and exploitation of the macroboring niche in the lower Paleozoic. |
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The Paleozoic comes after the Neoproterozoic era of the Proterozoic and is followed by the Mesozoic. |
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The Caledonian orogeny was one of several orogenies that would eventually form the supercontinent Pangaea in the Late Paleozoic era. |
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The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon and is followed by the Mesozoic Era. |
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The Parareptilia and synapsid amniotes were common during the late Paleozoic, while diapsids became dominant during the Mesozoic. |
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Other classes and orders, now long extinct, also occur as fossils, particularly from the late Paleozoic and Mesozoic eras. |
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This second period of the Paleozoic era created abundant fossils that became major petroleum and gas reservoirs. |
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The first period of activity occurred during the Paleozoic era, with two periods of change. |
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They are essentially fused plates which correspond to the parallel ambulacral plates in sea stars and five Paleozoic families of ophiuroids. |
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In the Paleozoic era, brittle stars had open ambulacral grooves, but in modern forms, these are turned inward. |
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They neared extinction at the end of the Paleozoic era, with just six species known from the Permian period. |
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Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. |
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Many fish of the Paleozoic developed external armor that protected them from predators. |
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The Antarctic Peninsula was formed by uplift and metamorphism of sea bed sediments during the late Paleozoic and the early Mesozoic eras. |
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It is a texturally immature sedimentary rock generally found in Paleozoic strata. |
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Common in some Paleozoic and Mesozoic strata, black shales were deposited in anoxic, reducing environments, such as in stagnant water columns. |
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Plains make up much of the eastern portion of the West, underlain with sedimentary rock from the Upper Paleozoic, Mesozoic, and Cenozoic eras. |
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The Permian spanned from 299 to 252 million years ago and was the last period of the Paleozoic Era. |
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The Central Lowlands is a rift valley mainly comprising Paleozoic formations. |
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The Cambrian spans from 541 million years to 485 million years and is the first period of the Paleozoic era of the Phanerozoic. |
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The organic-rich shales in the Lower Qusaiba constitute the main source rock for the kingdom's Paleozoic petroleum system. |
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Regional metasomatic dolomitization associated with tectonic disturbances in Lower Paleozoic of the Northern Baltic region. |
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While macroscopic plant life appeared early in the Paleozoic Eon and possibly late in the Neoproterozoic Era of the earlier eon. |
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The earliest microfossil record is an admixture of redeposited Paleozoic spores and pollen from distant deglaciated sites. |
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Transcurrent continental tectonics model for the Ossa-Morena Zone Neoproterozoic Paleozoic evolution, SW Iberian Massif, Portugal. |
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Paleoclimatic studies and evidence of glaciers indicate that central Africa was most likely in the polar regions during the early Paleozoic. |
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Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms. |
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But in Syria and Iraq, there are major unconformities between the Lower and Upper Paleozoic. |
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Fish, arthropods, amphibians, anapsids, synapsids, euryapsids and diapsids all evolved during the Paleozoic. |
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The early Paleozoic ended, rather abruptly, with the short, but apparently severe, late Ordovician ice age. |
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The basement of the region is composed of Paleozoic metamorphosed rocks and Mesozoic ophiolites. |
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The Narmer-1X and the Neilos field are elements of an emerging Paleozoic play pioneered in the Western Desert by Apache. |
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The eastern slopes are relatively flat, with some hills and rocky outcrops and contain alternating volcanic and sedimentary layers dated to the middle Paleozoic Era. |
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It received international sanction in 1960, when it was adopted as an official period of the Paleozoic Era by the International Geological Congress. |
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The Devonian ended with a series of turnover pulses which killed off much of middle Paleozoic vertebrate life, without noticeably reducing species diversity overall. |
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The Central Lowlands is largely underlain by Paleozoic formations. |
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The Dalradian Supergroup consists of metasedimentary rocks which underwent polyphase deformation and metamorphism during the Precambrian and early Paleozoic. |
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Burchfiel and Chen focus on the evolution of the 14 tectonic units in the region from middle Paleozoic to Recent, with a major emphasis on Mesozoic and Cenozoic time. |
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His research interests include the magnetic polarity time scale for pre-oceanic periods and changes in magnetic reversal frequency since the Paleozoic Era. |
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Evidence for pollination-drop mechanism in Paleozoic pteridosperms. |
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This book presents a detailed picture of the evolution of the South Caspian and North to Central Iran basins during the Late Paleozoic and Cenozoic eras. |
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Evidence for a pollination-drop mechanism in Paleozoic pteridosperms. |
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The geological substrate of the caatinga is severely eroded crystalline bedrock of the Precambrian Brazilian Shield and Paleozoic and Mesozoic sedimentary basins. |
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Paleozoic echinoids probably inhabited relatively quiet waters. |
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A noteworthy feature of Paleozoic life is the sudden appearance of nearly all of the invertebrate animal phyla in great abundance at the beginning of the Cambrian. |
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The Ordovician saw the highest sea levels of the Paleozoic, and the low relief of the continents led to many shelf deposits being formed under hundreds of metres of water. |
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The next two periods of the Paleozoic era, the Ordovician and Silurian, were named after ancient Celtic tribes from this area based on Murchison's and Sedgwick's work. |
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The earliest geological period of the Paleozoic era, the Cambrian, takes its name from the Cambrian Mountains, where geologists first identified Cambrian remnants. |
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His research interests include ichnology and geology of the lower Paleozoic of north Wales, the Paleozoic of eastern Canada and Maine, and the Cenozoic of the Antilles. |
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There are many unanswered questions about the late Paleozoic. |
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