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Sentence Examples In a general article on reef succession, Copper noted the role of stromatoporoids in the climax phase of Silurian and Devonian reefs. The emergence of terrestrial vertebrates from fish in the Late Devonian was one of the most significant events in the history of life. Observations on the Silurian and Devonian systems of the United States, with descriptions of new organic remains. During the Late Silurian and Early Devonian, the Royal Creek area lay at the margin of a deep-water embayment. Dolostone septaria and iron sulfide nodules occur in the Late Devonian Huron Shale. By the end of the Devonian, ferns, horsetails and seed plants had also appeared, producing the first trees and the first forests. They were hit hard by the terminal Devonian extinction event, and most marine forms died out then, only the coelacanths continuing. The oldest well-known fossil hexapod is called Rhyniella praecursor, a collembolan from the Early Devonian age Rhynie Chert. There is no microbial encrustation of the surface, as reported, for example, in Devonian palaeokarsts of the Canning Basin. Jawless fishes and placoderms were also affected, although many placoderm lineages survived quite happily until the end Devonian. They evolved in the Devonian, comprising evolute to involute planispirally coiled conchs quite similar to that of the contemporaneous nautiloids. The coelacanths were a side group of crossopterygians who evolved along separate lines from the rhipidistians in the Devonian. The upper boundary of the Centroiberica zone is not conformable with younger strata and Silurian and Devonian strata may be absent. The complexes were stacked during the Devonian in an accretionary wedge to the west or NW of the Rheic oceanic basin. Tucked away in Devonian hills as green as the heart of a lettuce is Dartington Hall, home of Dartington international summer school. However, a range of volcanic ages from Lower Cambrian to Early Devonian is suggested on biostratrigraphic grounds. In the Lower Devonian, ammonoids appeared, leaving us large limestone deposits from their shells. Tulerpeton, from the Upper Devonian of Russia, is found in a deposit with a rich fauna of marine invertebrates. During the Early Devonian two realms were separated by a ridge extending through the centre of the continent. Grotte Pere-Noel lies under woodland with a brown forest soil on Devonian limestones and dolomite. Show More Sentences Some 360 million years ago, at the end of the Devonian era, an evolutionary experiment was underway. Minor glaciations may also have taken place in the earlier Ordovician early Silurian and late Devonian. The heavily armored fish from the Devonian became extinct, being replaced with fish fauna that look more modern. Variably serpentinized Devonian mafic and ultramafic intrusive rocks occur in the western and northern parts of the map area. The catastrophe of the Late Devonian was roughly equivalent in magnitude to the event at the end of the Cretaceous that killed the dinosaurs. The collision of North America with the Avalon microcontinent during the Devonian Period caused the Acadian orogeny. At some point during the lower Devonian, the sea began to transgress again, and this continued through the deposition of the Port Ewen formation. The Early Triassic rifting episode followed the older Devonian and Carboniferous structural grains. Silurian and lower Devonian sedimentary successions are uncommon within the remnants of Gondwana. So far, only few biostratigraphically well-constrained isotopic ages constitute the geochronological framework of the Devonian period. It is composed of a number of imbricate thrust units involving Ordovician to Devonian sediments, volcanic rocks and ophiolites. Underlying the glacial deposits is approximately 330 ft of Devonian limestone and dolomite. Overlying elastic material derived from the volcanic rocks is estimated to be of Late Devonian to Early Carboniferous age. By the late Devonian, 360 million years ago, early cartilaginous fish and bony fish were diversifying. If we are correct, the Late Devonian wood problem was an almost inevitable result of evolutionary developments at the dawn of life. Of course, being Mr BW, the first thing he did on returning from our Devonian exploits last night was to wander round the garden. The most persistent bed of nodules is found in the Late Devonian Huron Shale. The bedrock ranges in age from Precambrian to Mississippian, but Cambrian, Ordovician, and Devonian rocks predominate. As an independent check on the overall oxygen trend, it is notable that fusain is found for the first time in the Late Devonian. The northern margin of the fold-thrust belt is composed of sedimentary sequences of Middle to Upper Devonian and Carboniferous rocks. Show More Sentences They concluded that the Bristol Channel Thrust juxtaposes the Devonian of north Devon and the Old Red Sandstone and Carboniferous of South Wales. Many paleobotanists believe that the earliest seed plants evolved from heterosporous Middle Devonian plants like the progymnosperms. Presumably primitive hexapods evolved from marginal marine and amphibious crustaceans during the late Silurian or early Devonian. The skulls of Devonian lungfish have a tessera of small superficial bones, fused to an ossified chondrocranium. Such giant cephalopods play or played a similar ecological role of top predator to that of Devonian arthrodire placoderms, Mesozoic pliosaurs and Cenozoic toothed whales. Baltica collided with Avalonia and they subsequently collided with Laurentia to complete the Laurussian continent during Silurian and earliest Devonian times. Fossilized spinnerets that occur in Middle Devonian rocks in Schoharie County, New York, show that spiders have been making silk for at least 380 million years. A Devonian CRM is interpreted to be related to hydrothermal fluids associated with Devonian volcanic rocks or to fluids triggered by late stages of the Caledonian orogeny. He recognized two different fossil fauna assemblages in the limestone and the divided the limestone into two distinct lithologic units of Devonian and Mississippian age. The sequence comprises Lower Ordovician conglomerates and carbonates overlain by Upper Ordovician to Middle Devonian limestone with occasional phyllite and quartzite. More specifically, the western part of the county is composed mainly of Devonian and Mississippian sandstones and shales with some Silurian and Ordovician rocks present. Lower crustal garnet granulite xenoliths from beneath the Kola-Karelian domain of the Fennoscandian Shield were brought to the surface in Devonian lamprophyre diatremes. During his stay at Kent State, Loren monographed the Devonian and Mississippian conulariids of North America, and described disarticulated conulariids. Conventionally, the Cambrian, Ordovician, and Silurian systems constitute the Lower Palaeozoic and the Devonian, Carboniferous, and Permian comprise the Upper Palaeozoic. Athyrids were most abundant during the Silurian and Devonian periods, but still remained common during the early Carboniferous, and even as late as the Permian. I still had the handful of yoghurt from the photo shoot and even though the yoghurt had curdled, this congealed dairy product was a feast to these backward Devonian fooles! Although there are no outcrops of Devonian extrusive volcanic rocks in NW Scotland, they can be found in southern and central Scotland and the Orkney Islands. The first tetrapods, or land-living vertebrates, appeared during the Devonian, as did the first terrestrial arthropods, including wingless insects and the earliest arachnids. That time, part of an interval of Earth's history called the Devonian Period by scientists such as geologists and paleontologists, is known popularly as the Age of Fishes. Related agnathans with external armour occur widely from the Late Silurian to the Devonian, but they all became extinct before the start of the Carboniferous. Show More Sentences Nodules and crystal groups of iron sulfide of Middle Devonian to Pennsylvanian age are frequently present in beds of black shale and coal or, less commonly, dolostone. The likeable Devonian, remember, had already made headlines of his own after a confrontation with abrasive Australian Quinten Hann at the end of his first-round win. Many Devonian species differ from Early Carboniferous species in having quadrate rather than cuneate brachials and in having straight-sided rather than zigzag arms. The significance of these other Silurian to early Devonian dates remains uncertain but large-scale lithospheric extension is the most likely cause. Silurian and Lower Devonian thelodonts and putative chondrichthyans from the Canadian Arctic Archipelago. Glass sponges are rare in the Ordovician and Silurian but are preserved in enormous numbers in Late Devonian formations of western New York. The variety of rocks of similar ages seen here have led to the county's name being lent to that of the Devonian period. Sea levels had dropped coincident with the ice age, but slowly recovered over the course of the Silurian and Devonian. The first vertebrates appeared in the form of primitive fish, which greatly diversified in the Silurian and Devonian Periods. The centre of the range comprises a Devonian granite outcrop surrounded by Silurian and Devonian andesite lava flows on each side. Exmoor is an upland area formed almost exclusively from sedimentary rocks dating from the Devonian and early Carboniferous periods. The Hangman Sandstone represents the Middle Devonian sequence of North Devon and Somerset. The superficial rock of Orkney is almost entirely Old Red Sandstone, mostly of Middle Devonian age. Middle Devonian basaltic volcanic rocks are found on western Hoy, on Deerness in eastern Mainland and on Shapinsay. Ben Nevis is all that remains of a Devonian volcano that met a cataclysmic end in the Carboniferous period around 350 million years ago. The Old Red Sandstone is an assemblage of rocks in the North Atlantic region largely of Devonian age. The Upper Devonian sequence is rather thinner and comprises a series of formations which are more laterally restricted. However, terrestrial life would not greatly diversify and affect the landscape until the Devonian. His interpretation was questioned in 1854 by Edward Forbes, and the later stages of Barrande, F, G and H, have since been shown to be Devonian. However, the land fauna did not have a major impact on the Earth until it diversified in the Devonian. Show More Sentences The Devonian also saw the rise of the first labyrinthodonts, which was a transitional form between fishes and amphibians. Pen y Fan is formed from various units of the Old Red Sandstone which were laid down during the Devonian period. Later radiations, such as those of fish in the Silurian and Devonian periods, involved fewer taxa, mainly with very similar body plans. The second factor was the lower sea levels that occurred during the Carboniferous as compared to the preceding Devonian period. The Devonian villages of Petrockstowe and Newton St Petroc are also named after Saint Petroc and the flag of Devon is dedicated to him. In common with its neighbouring isles, Eday is largely formed from Middle Devonian Old Red Sandstone deposited in the Orcadian Basin. It collided with southern Baltica in the Devonian, though this microcontinent was an underwater plate. In the Devonian Period, Gondwana itself headed towards Euramerica, causing the Rheic Ocean to shrink. It appears to have been intruded along the interface between Devonian and Carboniferous rocks. Among the earliest fossils believed to be liverworts are compression fossils of Pallaviciniites from the Upper Devonian of New York. The Cheviot Hills, in the northwest of the county, consist mainly of resistant Devonian granite and andesite lava. The soil is alluvial, derived from Devonian, Carboniferous and Permian rocks. Dolomitization of the Middle Devonian Winnipegosis carbonates in south-central Saskatchewan, Canada. Exploration opportunities targeting the Ordovician Red River and Devonian Winnipegosis horizons appear to be particularly promising. A new sea spider with a flagelliform telson from the Lower Devonian Hunsruck Slate, Germany. Infestation of middle Devonian camerate crinoids by platyceratid gastropods and its implications for the nature of their biotic interaction. The stage names of the Lower Devonian and of the Upper Devonian are all derived from localities in Shropshire or Breconshire. Carbon isotope stratigraphy of the Devonian of Central and Southern Europe. The sandstones are considered to be derived from Devonian Old Red Sandstone in the Munster basin on the Irish mainland. Biostratigraphical correlations of Early Devonian vertebrate assemblages of the Old Red Sandstone Continent. Show More Sentences Known to experts as Devonian Old Red Sandstone, it varies in colour, at best, the most subtle grey pink. Root traces from the Holy Cross Mountains are larger and more complex than previously postulated for land vascular plants in Early Devonian time. Redescription and palaeobiology of Palaeoscorpius devonicus Lehmann, 1944 from the Lower Devonian Hunsruck Slate of Germany. This was followed by a paleoecological study of Devonian fauna in the region, where he narrowed his interest to mollusks. A Palynological Study of the Ordovician to Devonian Sediments of the Anti Atlas, Morocco. This outcrop was mapped as Upper Devonian Ohio Shale by Reidel and lies stratigraphically above a Middle Silurian dolostone. Phytosociology and phytogeography of the calcareous grasslands on Devonian limestone in southwest Belgium. The volume also highlights the Devonian period with three articles on placoderms, the Gogo fish fossils, and the origin of whales. In the incomplete Lower Devonian sequence the Phialaspis heterostracan Zone and the Skamolepis fragilis thelodont Zone have been recognized. The ichnofossil record of inferred phoronids dates back to the Devonian. Devonian conglomerates composed of sandstones and pelites appear in the area, and Carboniferous marine formations are unconformably overlain in sequence. The soils are formed mainly of Devonian dolomite, dolomite marlstone, and clay bedrocks, moraine clayey material, sandy eolic and alluvial deposits. Devonian sandstone that lies unconformably on the Archaean basement rocks. The warm climate and floods of the Devonian period produced fishes, ammonoids, and reefs but it also accommodated two of the biggest mass extinction events ever. Another Devonian fossil called Protosalvinia also looks like a liverwort, but its relationship to other plants is still uncertain, so it may not belong to the Marchantiophyta. The oldest fossil lichens in which both symbiotic partners have been recovered date to the Early Devonian Rhynie chert, about 400 million years old. Another famous mariner and Devonian was Robert Falcon Scott, the leader of the unfortunate Terra Nova Expedition to reach the geographical South Pole. Their prototypes are the oldest winged fossils, dating back to the Devonian, and are different in several respects from the wings of other insects. Land plants were so successful that they caused an ecological crisis in the Late Devonian, until the evolution and spread of fungi that could digest dead wood. He founded the system for the classification of Cambrian rocks and with Roderick Murchison worked out the order of the Carboniferous and underlying Devonian strata. Show More Sentences He proposed the Devonian period of the geological timescale. Extrapolating back from Early Devonian biota, Andrew Jeram et al. The hills are part of a Devonian lava extrusion whose appearance today is largely due to the Ochil Fault which results in the southern face of the hills forming an escarpment. The lowermost Devonian formation is the St Maughans Formation, itself overlain by the Brownstones Formation though with an intervening Senni Formation over much of the area. The name was first used in 1885 by Austrian geologist Eduard Suess for an episode of mountain building in northern Europe that predated the Devonian period. This consists of the cemented sediments of Lake Orcadie, which is believed to have stretched from Shetland to Grampian during the Devonian period, about 370 million years ago. The oldest occurring rocks in the area surrounding the city originate from the Devonian period and include carboniferous sandstone, greywacke, claystone and limestone. The upland area is underlain by sedimentary rocks dating from the Devonian and early Carboniferous periods with Triassic and Jurassic age rocks on lower slopes. Plants mostly remained aquatic until sometime in the Silurian and Devonian Periods, about 420 million years ago, when they began to transition onto dry land. The Devonian ended with a series of turnover pulses which killed off much of middle Paleozoic vertebrate life, without noticeably reducing species diversity overall. The Devonian spanned from 416 million years to 359 million years. Further collisions caused the Variscan orogeny in the Devonian and Carboniferous periods, forming the hills of Munster, southwest England, and southern Wales. Ancestral horseshoe crabs, often found associated with eurypterids in Silurian and Devonian strata, are sporadically represented in the geologic column. Examples from Classical Literature Look at these old Devonian rocks, with their fossils as fresh as of yesterday. In the history of our globe the Carboniferous period succeeds to the Devonian. These amphibians are evidently the descendants of some of the fishes of the Devonian times. The next period of the Palozoic is known as the Devonian age, or the age of fishes. The literature of the fauna of the Devonian rocks is a rich one. The geological formation is Devonian and granitic, with laterites. By middle Devonian time these water areas had considerably expanded. Occur exclusively in palaeozoic strata from Devonian upwards. Herein we see the greater variety and richness of the Devonian. Their remains are found in the Devonian and Carboniferous deposits. A remarkable formation of late Devonian Age should be briefly described. Find more words! 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Use our Sentence Generator Nearby Words Devon devon devolving devolves devolvement devolved Devonport Devonshire DevOps Devore devote devoted