ordovician in English
These are overlain by low-grade metamorphosed sediments and volcanics of Ordovician and Silurian age.
Use "ordovician" in a sentence
1. The earliest Bryozoans are from the Early Ordovician
2. The Brachiopods were at their peak during the Ordovician
3. Beresite (2) metasomatism (2) mineral deposits, genesis (2) Paleozoic Ordovician Lower Ordovician (1) Precambrian upper Precambrian Proterozoic Neoproterozoic Riphean upper Riphean
4. Its original cooling age has been determined as middle Ordovician (Acadian phase).
5. A: Spyroceras, a common Ordovician and Silurian Cephalopod with a straight and ridged shell [10 cm].B: Richardsonoceras, common in Ordovician rock [11 cm].C: Crescent-shaped Richardsonoceras [5.5 cm].D and E: Examples of Whitfieldoceras, an Ordovician Cephalopod with a constricted body chamber [2.5 and 5 cm, respectively].
6. In the center, the Ordovician may still be releasing mobile hydrocarbons.
7. In Tazhong-88 Well, the conodont fossils in the late of Middle Ordovician and the early of Late Ordovician slope facies have been found for the first time.
8. Bryozoans have a long fossil history, starting in the Ordovician
9. Biostratigraphically, Ampullula is an important genus indicating upper Lower to Middle Ordovician intervals
10. The first Bryophytes (liverworts) most likely appeared in the Ordovician period, about 450 million years ago
11. A number of regional terms have been used to subdivide the Ordovician Period.
12. Trilete spores similar to those of vascular plants appear soon afterwards, in Upper Ordovician rocks.
13. 8 A rift trough along Mianxian - Lueyang ophiolitic melange belt was formed from Ordovician to Silurian.
14. Bryozoan fossils can be found in Kentucky's Ordovician, Silurian, Devonian, Mississippian, and Pennsylvanian rocks
15. The first Bryophytes (liverworts) most likely appeared in the Ordovician period, about 450 million years ago
16. The first Bryophytes (liverworts) most likely appeared in the Ordovician period, about 450 million years ago
17. (2) The higher Stolzalpe nappe, metamorphosed very low to low grade, contains Ordovician to Lower Silurian volcanic formations.
18. Ampullula was widely distributed throughout peri-Gondwana and Baltica suggesting a global distribution during the late Early–Middle Ordovician
19. Chelicerata Chelicerata include horseshoe crabs, scorpions, spiders, and mites. They originated as marine animals, possibly in the Late Ordovician period
20. Most oil shale deposits were formed during Middle Cambrian, Early and Middle Ordovician, Late Devonian, Late Jurassic and Paleogene times.
21. The first confirmed Chelicerate fossils, the eurypterids, date from 445 million years ago in the late Ordovician period
22. Ampullula is an important genus in biostratigraphy for the recognition of the late Early–Middle Ordovician time interval
23. They form the filling of several craters and pipes, which are unconformably overlain by Ordovician respectively Silurian sediments.
24. Crinoids have lived in the world's oceans since at least the beginning of the Ordovician Period, roughly 485 million years ago.
25. The Cambrian period lies between the Ediacaran period at the end of the Proterozoic eon and the Ordovician period, …
26. Ampullula was widely distributed throughout peri-Gondwana and Baltica suggesting a global distribution during the late Early–Middle Ordovician
27. The Batholith formed during a Late Silurian to Early Devonian melting and rifting event that split the Ordovician to Early Silurian Macquarie Arc.
28. Cystoid, any member of an extinct class (Cystoidea) of primitive echinoderms (animals with a hard, calcareous external skeleton, related to the modern sea lily and starfish) that first appeared during the Middle Ordovician Epoch and persisted into the Late Devonian Epoch (the Ordovician Period began about 488 million years ago, and the Devonian Period ended 359 million years ago).
29. A major thrust fault that runs north-south through the area separates autocthonous Ordovician rock units to the west from Allocthonous Cambrian (Taconic) rocks to the east
30. From Wikipedia, the free encyclopedia PrototAxites / ˌproʊtoʊˈtæksɪˌtiːz / is a genus of terrestrial fossil fungi dating from the Middle Ordovician until the Late Devonian periods, approximately 470 to …
31. A restudy of the Ordovician (Arenig-Llanvirn) acritarch taxa Tranvikium polygonale Tynni, 1982, and Ampullula suetica Righi, 1991, indicates that they represent extremes in a single morphological plexus
32. Humber Zone mélanges are spatially associated with Taconian nappes and believed to be of tectonic origin. Dunnage Zone mélanges are interpreted as relicts of an Ordovician accretionary prism.
33. 12 Therefore, conventional seismic data can be used to effectively predict large fractured, fractured-cavern, carven and cave reservoirs of Ordovician carbonate in Central Tarim basin.
34. Brachiopods, a dominant element of Ordovician animal life, lived in and on the sediment in large groups, and formed dense accumulations in the rock when they died
35. The Carboniferous was the second-to-last period of the Paleozoic Era (541-252 million years ago), preceded by the Cambrian, Ordovician, Silurian, and Devonian periods and succeeded by the Permian period
36. Cambro-Ordovician (600 to 440 million years ago (Ma)), meta-sediments (acoustic basement), and the accretionary wedge of Mesozoic (225 to 65 Ma) and Cenozoic ( 65 Ma) sediments which form the Scotian Basin.
37. Where absence of Carboniferous Fe Bauxitite cap rocks at top of Ordovician paleoeathering crust has caused-w the coal-type gas sourced from Carboniferous-Permian coals migrate along the unconformity, and to mix with local oilto type - gas
38. Bryozoan: Spatiopora corticans (PRI 76725) by Digital Atlas of Ancient Life on Sketchfab Fossil specimen of the Bryozoan Spatiopora corticans encrusting the shell of a straight-shelled cephalopod; specimen is from the Ordovician Waynesville Formation of Butler County, Ohio.
39. Late Permian Brachiopoda fauna in north-western Iran A team of scientists analyzed more than 46,000 fossils from 52 sites and found that greater numbers did indeed help clam-like brachiopods survive the Ordovician extinction, which killed off approximately half of …
40. Belemnite & straight cephalopod fossils for sale Belemnites and other straight-shelled Cephalopods represent a major portion of the marine biomass from the Ordovician Period 467 million years ago, until they died out with the dinosaurs 65 million years ago.
41. Anthozoa (sea-anemones, corals, sea pens; phylum Cnidaria) A class of exclusively polyploid, marine cnidarians.They probably first appeared in the Ordovician although there are possible records for some groups in the Cambrian.They are solitary or colonial and usually sedentary
42. ‘The body outline is similar to the Asteroidea, in that they have five arms joined to a central disk (calyx).’ ‘True starfish are classified in the Asteroidea, a group of echinoderms.’ ‘Together, the two ancient fossils demonstrate that the class Asteroidea was established by early in the Ordovician.’
43. The Cambrian was the first period of the Paleozoic Era (542-250 million years ago), followed by the Ordovician, Silurian, Devonian, Carboniferous and Permian periods; all of these periods, as well as the succeeding Mesozoic and Cenozoic Eras, were dominated by the vertebrates that first evolved during the Cambrian.
44. The accumulated sediments in the karstic caverns derive from the periodic inwashing of the insoluble residues built up on the surface of erosion, were indurated after the sealing of the karstic openings with calcareous muds during the Ordovician transgression, and were faulted with their cover when the Saguenay graben formed.
45. Practically all you need to know about vertebrate life during the Ordovician period is contained in the "Aspises," especially Arandaspis and Astraspis.These were two of the first jawless, lightly armored prehistoric fish, measuring anywhere from six to 12 inches long and vaguely reminiscent of giant tadpoles.The bony plates of Arandaspis and its ilk would evolve in
46. Closely comparable faunal associations and the joint occurrence ofKvania kvanica (Mergl 1984) are evidence of a correlation in age with the Milina Formation of Bohemia and of a close biogeographical relationship of the Bavarian type of facies with the Barrandian during the Lower Ordovician. Further,Euloma ornatumAngelin 1854 allows direct correlation of the Vogtendorf Formation and indirect correlation of the Milina Formation with the late Tremadocian (Shumardia pusilla Zone of the Alum Shale Formation and the Bjørkåsholmen Formation) of Scandinavia.