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Third period of the Paleozoic Era
The Silurian (/sɪˈljʊəri.ən, saɪ-/ sih-LURE-ee-ən, sy-) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period
Silurian
Thought experiment to assess ability to detect evidence of a prior advanced civilization
The Silurian hypothesis is a thought experiment which assesses the ability of modern science to detect evidence of a prior advanced civilization, perhaps
Silurian_hypothesis
Fictional race from the television series Doctor Who
The Silurians and Sea Devils are two fictional related ancient species created by Malcolm Hulke for the British science fiction television series Doctor
Silurian_and_Sea_Devil
Topics referred to by the same term
The Silurian is the geological period and system lasting roughly from 445 million years ago to 415 million years ago. Silurian may also refer to: Silurian
Silurian_(disambiguation)
Mass extinction event c. 444 million years ago
sometimes referred to as the end-Ordovician mass extinction or the Ordovician–Silurian extinction, is the first of the "big five" major mass extinction events
Late Ordovician mass extinction
Late_Ordovician_mass_extinction
American press club
The Silurians Press Club, also known as The Society of the Silurians, is an American organization composed of veteran journalists based in New York City
The_Silurians_Press_Club
First era of the Phanerozoic Eon
six geologic periods, (from oldest to youngest) Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Some geological timescales divide
Paleozoic
Period of rapid plant and fungal diversification, 428–359 million years ago
The Silurian-Devonian Terrestrial Revolution (SDTR), also known as the Devonian Plant Explosion (DePE) and the Devonian explosion, was a period of rapid
Silurian-Devonian Terrestrial Revolution
Silurian-Devonian_Terrestrial_Revolution
First Series of the Silurian
Epoch or Early Silurian (from 443.1 ± 0.9 million years ago to 432.9 ± 1.2 million years ago) occurred at the beginning of the Silurian Period. The Llandoverian
Llandovery_Epoch
Second period of the Paleozoic Era
the Cambrian Period 486.85 Ma (million years ago) to the start of the Silurian Period 443.1 Ma. The Ordovician, named after the Welsh tribe of the Ordovices
Ordovician
Fourth period of the Paleozoic Era
Phanerozoic eon, spanning 60.7 million years from the end of the preceding Silurian period at 419.62 million years ago (Ma), to the beginning of the succeeding
Devonian
1970 British sci-fi TV serial
Doctor Who and the Silurians is the second serial of the seventh season in the British science fiction television series Doctor Who. It was first broadcast
Doctor_Who_and_the_Silurians
Geological formation in Indiana and Kentucky
the Silurian period. Earth sciences portal Indiana portal Paleontology portal List of fossiliferous stratigraphic units in Indiana The Silurian of central
Laurel_Formation_(Silurian)
Landform in San Bernardino County, California
Silurian Valley is a valley in the Mojave Desert, in San Bernardino County, California. The valley trends in a north–south direction, its mouth located
Silurian_Valley
Extinct genus of indeterminate eukaryote
is an extinct genus of large macroscopic eukaryote dating from the Late Silurian until the Late Devonian periods. Prototaxites formed large trunk-like structures
Prototaxites
Subphylum of chordates
ago. Jawed vertebrates evolved in the Ordovician or Silurian; bony fishes appeared in the Silurian and diversified widely in the Devonian. The first tetrapods
Vertebrate
Extinct genus of marine invertebrates
ophiocistioid that is known from Silurian to Devonian. Sollasina cthulhu from the Coalbrookdale Formation of the Silurian Herefordshire Lagerstätte in England
Sollasina
Large carbonate geologic unit in midwestern USA
Limestone is predominantly composed of carbonate rock, deposited between the Silurian and early to mid Devonian periods. In many States it acts as a reservoir
Hunton_Megagroup
Class of extinct, Paleozoic arthropods
trilobites during the Silurian and Devonian periods include: Dalmanites (Early to Late Silurian) Calymene (Silurian) Encrinurus (Silurian) Exallaspis (Middle
Trilobite
Celtic tribe of ancient Britain
such as "Silurian". The poet Henry Vaughan called himself a "Silurist", by virtue of his roots in South Wales. The geological period Silurian was first
Silures
2nd Series (Epoch) of the Silurian
(sometimes referred to as the Wenlockian) or Mid-Early Silurian is the second epoch of the Silurian. It is preceded by the Llandovery Epoch and followed
Wenlock_Epoch
Genus of annelid worms
of polychaete worm from the Silurian (late Wenlock–late Ludlow epochs) of Gotland and Estonia. It is the largest Silurian member of Paulinitidae, a family
Kingnites
Order of arthropods (fossil)
components of marine faunas during the Silurian, from which the majority of eurypterid species have been described. The Silurian genus Eurypterus accounts for
Eurypterid
Episode of Doctor Who
humanoid Silurians. In the episode, deep underground, humans Amy Pond (Karen Gillan) and Nasreen Chaudhry (Meera Syal) have a conference with the Silurians' leader
Cold_Blood_(Doctor_Who)
Extinct order of sponges
reef-building sponges. However, they were relatively uncommon through most of the Silurian and Devonian, in contrast to other stromatoporoids. Labechiids can be differentiated
Labechiida
Extinct order of crustaceans
appeared in the Late Cambrian and became very diverse in both the Late Silurian and the Devonian. "Archaeostraca Claus, 1888 †". WoRMS. World Register
Archaeostraca
Extinct genus of arthropods
from the Silurian Herefordshire lagerstatte; it filter-fed on mud particles on the sea floor. It is the only marrellomorph known from the Silurian period
Xylokorys
Fourth and current eon of the geological timescale
diversify. There are six periods in the Paleozoic era: Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. The Cambrian is the first period
Phanerozoic
Clade of lobe-finned fish
skin-covered bony spines supporting the fins. Sarcopterygii emerged in the Silurian and early Devonian periods consisting entirely of aquatic species, but
Sarcopterygii
Range of hills in the Mojave Desert, southern California
The Silurian Hills are a small range of hills in the Mojave Desert, southeast of Death Valley National Park, in southern California. The surrounding lower
Silurian_Hills
Infraphylum of vertebrates
fossils, mostly of primitive acanthodians, begin appearing by the early Silurian, and become abundant by the start of the Devonian. Gnathostomata is traditionally
Gnathostomata
Extinct class of corals
Stromatoporoidea (a type of extinct reef-building sponge), especially in the Silurian period. As with other cnidarians, it is presumed that these Palaeozoic
Rugosa
Lagerstätte Fossil site in Waukesha County, Wisconsin, U.S.
certain strata within the Brandon Bridge Formation, which dates to the early Silurian period. It is known for the exceptional preservation of soft-bodied organisms
Waukesha_Biota
Geologic formation in Quebec, Canada
in Quebec. It preserves fossils dating back to the Ludlow epoch of the Silurian period. The Indian Point Formation comprises thin- to thick-bedded, locally
Indian_Point_Formation
Large Geologic Group
The Salina Group or Salina Formation is a Late Silurian-age, stratigraphic unit of sedimentary rock that is found in Northeastern and Midwestern North
Salina_Group
Extinct genus of scorpion
Eramoscorpius is an extinct genus of Silurian scorpions from the Eramosa Member in Ontario. It was likely one of the first semi-terrestrial scorpions.
Eramoscorpius
Class of extinct corals
corals, the tabulate corals are characteristic of the shallow waters of the Silurian and Devonian. Sea levels rose in the Devonian, and tabulate corals became
Tabulata
Extinct paraphyletic class of fishes
extinct group of prehistoric fish known from Paleozoic fossils during the Silurian and the Devonian periods. While their endoskeletons are mainly cartilaginous
Placoderm
Termination of a taxon in a region which it previously inhabited
Latent extinction risk Living fossil Extinction events Major Ordovician–Silurian Late Devonian Permian–Triassic Triassic–Jurassic Cretaceous–Paleogene Holocene
Local_extinction
Water transport tissue in vascular plants
life. Fossil plants with anatomically preserved xylem are known from the Silurian (more than 400 million years ago), and trace fossils resembling individual
Xylem
Chronological outline of major events in the development of plants
time, but there were no land plants with vascular tissues until the mid-Silurian. The evidence of plant evolution changes dramatically in the Ordovician
Timeline_of_plant_evolution
Episode of Doctor Who
the earth and disrupting a civilisation of Silurians who dwell beneath the earth. In turn, the Silurians open holes in the ground to experiment on one
The_Hungry_Earth
Donald A.; Laflamme, Marc (2026-02-24). "Comparing biotic compositions of Silurian Lagerstätten". Palaeogeography, Palaeoclimatology, Palaeoecology. 689 113639
List_of_lagerstätten
Rock domed outcrop in south-east Wales
The Usk Inlier is a domed outcrop of rock strata of Silurian age in Monmouthshire in south-eastern Wales. It is located in the countryside between the
Usk_Inlier
Group of organic microfossils
Lophosphaeridium (Ordovician-Silurian) Lunulidia Micrhystridium (Ordovician-Silurian) Multiplicisphaeridium (Cambrian-Silurian) Nanocyclopia (Ordovician)
Acritarch
Extinct genus of bony fishes
"big mouth") is a genus of stem bony fish which lived during the late Silurian period, about 423 million years ago, in China. Before the discovery of
Megamastax
First geological period of the Paleozoic Era
between the Cambrian and the overlying Silurian, together with Roderick Murchison, in their joint paper "On the Silurian and Cambrian Systems, Exhibiting the
Cambrian
Origin and diversification of fish through geologic time
Ordovician period. They are first represented in the fossil record from the Silurian by two groups of fish: the armoured fish known as placoderms, which evolved
Evolution_of_fish
Mapped unit of rock in North America
Historically the term "Clinton" has also been assigned to several lower Silurian stratigraphic units in Ohio and Kentucky which are now known to be significantly
Clinton_Group
Extinct genus of brittle stars
Furcaster is an extinct genus of brittle stars. It lived from the Silurian to Devonian periods. Furcaster palaeozoicus is known from the Hunsrück Slate
Furcaster
Taxon that disappears from the fossil record, only to reappear later
Latent extinction risk Living fossil Extinction events Major Ordovician–Silurian Late Devonian Permian–Triassic Triassic–Jurassic Cretaceous–Paleogene Holocene
Lazarus_taxon
Final Series (Epoch) of the Silurian
fourth and latest epoch of the Silurian Period, corresponding to the Přídolí Series, the uppermost subdivision of the Silurian System. It is dated at between
Pridoli_Epoch
Paraphyletic infraphylum of fish
known as gnathostomes, who evolved from jawless ancestors during the early Silurian by developing folding articulations in the first pairs of gill arches.
Agnatha
Glaciation 460 million to 430 million years ago
Africa and the Arabian Peninsula. In all areas of North Africa where Early Silurian shale occurs, Late Ordovician glaciogenic deposits occur beneath, likely
Hirnantian_glaciation
British geologist (1792–1871)
until his death in 1871. He is noted for investigating and describing the Silurian, Devonian and Permian systems. Murchison was born at Tarradale House, Muir
Roderick_Murchison
Extinct genus of trilobites
Arcticalymene is a genus of trilobites found in Silurian-aged marine strata of Arctic Canada and Central Victoria, Australia. The Canadian species are
Arcticalymene
List of extinct species
Latent extinction risk Living fossil Extinction events Major Ordovician–Silurian Late Devonian Permian–Triassic Triassic–Jurassic Cretaceous–Paleogene Holocene
Lists_of_extinct_species
Genus of primitive horseshoe crab
Ciurcalimulus is a genus of xiphosuran from the Silurian-aged Wabash Formation of Indiana, United States. It is one of the earliest known relatives of
Ciurcalimulus
Genus of millipedes
originally considered that it lived during the late Wenlock epoch of the Silurian period around 428 million years ago. However, a 2017 study dates its occurrence
Pneumodesmus
Extinct genus of chelicerate
Bunaia is a genus of Silurian chelicerate arthropod. The genus contains at least one species: Bunaia woodwardi from the Silurian period in Svalbard, Norway
Bunaia
Extinct order of arachnids
a group of extinct arachnids whose fossil record extends from the late Silurian to the early Permian (Pridoli to Sakmarian). These animals are known from
Trigonotarbida
Relatively minor mass extinction during the Silurian period
minor mass extinctions (the Ireviken, Mulde, and Lau events) during the Silurian period. It had a major effect on the conodont fauna, but barely scathed
Lau_event
This timeline of Silurian research is a chronological listing of events in the history of geology and paleontology focused on the study of Earth during
Timeline_of_Silurian_research
pedicle, representing the first case of soft tissue preservation in a Silurian linguliform brachiopod. Müller et al. (2026) report a mass occurrence of
2026_in_paleontology
First stage of the Silurian
timescale, the Rhuddanian is the first age of the Silurian Period and of the Llandovery Epoch. The Silurian is in the Paleozoic Era of the Phanerozoic Eon
Rhuddanian
Sedimentary deposit in Estonia
The Kalana lagerstätte is a lagerstätte from the early Silurian of Estonia, contained within the Nurmekund Formation. It contains a fairly diverse biota
Kalana_lagerstätte
Diverse clade of vertebrate animals
known fossils of bony fish are about 436 million years old from the early Silurian period, which are also transitional fossils showing a tooth pattern that
Osteichthyes
Mountain building event caused by the collision of Laurentia, Baltica and Avalonia
of the Caledonian orogeny which includes "all the Cambrian, Ordovician, Silurian and Devonian tectonic events associated with the development and closure
Caledonian_orogeny
Rapid decrease in Earth's biodiversity
(LOME) was probably a two-pulse event just prior to and at the Ordovician–Silurian transition. The first pulse corresponds to a cooling event and large Southern
Extinction_event
geologist and palaeontologist whose work has focused on the Ordovician and Silurian systems, including rugose corals and graptolites, Baltic basin evolution
Dimitri_Kaljo
Geologic uplift in the Midwestern United States
developing across eastern Indiana during the late Ordovician. By the Early Silurian the seas northwest of the Cincinnati Arch began to become shallower. By
Kankakee_Arch
Trace fossil
largest known Palaeozoic boring trace. It occurs in the Ordovician and Silurian (Wenlock) of Baltica. The borings are up to 120 mm long measuring 5–17 mm
Osprioneides
English actor (1933–2018)
in full costume as aliens or monsters. These roles include: a Silurian in The Silurians (1970); a Primitive in Colony in Space (1971); a Sea Devil in
Pat_Gorman
Spider Catalog. Natural History Museum Bern O. Erik Tetlie (2006). "Two new Silurian species of Eurypterus (Chelicerata: Eurypterida) from Norway and Canada
List_of_eurypterid_genera
Subclass of Pterobranchs in the phylum Hemichordata
graptoloids in particular are useful index fossils for the Ordovician and Silurian periods. The name graptolite comes from the Greek graptos meaning "written"
Graptolite
Northern landmass that formed part of the Pangaea supercontinent
suture. The "Old Red Continent" is an informal name often used for the Silurian-Carboniferous deposits in the central landmass of Laurussia. Several earlier
Laurasia
Extinct genus of cartilaginous fishes
is an extinct genus of acanthodian, probably acritolepid, from Middle Silurian (?late Llandovery (Telychian) to Ludlow stages) deposits of New Brunswick
Nerepisacanthus
Middle series of strata in the Silurian (Upper Silurian) of Great Britain
(Wenlockian), in geology, is the middle series of strata in the Silurian (Upper Silurian) of Great Britain. This group in the typical area in the Welsh
Wenlock_Group
Geologic formation in China
is a palaeontological formation located in China. It dates to the Lower Silurian period. Studies of conodonts found in the formation suggests the lower
Xiushan_Formation
Extinct genus of enigmatic arthropod
extinct genus of arthropod containing the species P. venator known from the Silurian-aged Waukesha Biota of the Brandon Bridge Formation near Waukesha, Wisconsin
Parioscorpio
Paleontological research in the U.S. state of Illinois
Mazon Creek fossils were being found. Early in the ensuing 20th century a Silurian age fossil reef system was discovered in the state. In the 1950s Francis
Paleontology_in_Illinois
Extinct genus of trilobites
Avalanchurus is an extinct genus of trilobites from the Silurian period. It was originally described in 1993 as a subgenus of Struszia, and then promoted
Avalanchurus
Second of the big five mass extinctions
During the Late Silurian and Devonian, land plants, assisted by fungi, underwent a hugely significant phase of evolution known as the Silurian-Devonian Terrestrial
Late_Devonian_mass_extinction
Serranías de Paraguarí in Paraguarí Department are made of Silurian sandstone of the Misiones Formation and alkaline intrusives of Early Cretaceous age
Geology_of_Paraguay
Extinct family of molluscs
rise to the Middle Silurian Phragmoceras, which gave rise to the closely related Middle Silurian Tubiferoceras and to the Upper Silurian Pristeroceras and
Phragmoceratidae
Extinct genus of scorpions
Maughan's Formation, Lochkovian-aged (previously also considered as late Silurian) sandstone from Trimpley, Worcestershire. Brontoscorpio anglicus was described
Brontoscorpio
Extinct genus of myriapod
Kampecarida, an enigmatic group of millipede-like arthropods, from the Silurian and early Devonian periods of Scotland and England. They are among the
Kampecaris
Extinct species of bony fish
of Guiyu have been found in what is now Qujing, Yunnan, China, in late Silurian marine strata, about 425 million years old. Guiyu is part of the Xiaoxiang
Guiyu_oneiros
Estonian geologist and palaeoichthyologist
resources. Her diploma work was titled ‘Vertebrate distribution in the Silurian of Estonia’. In 1973–1976, she was a postgraduate student of palaeontology
Tiiu_Märss
Extinct order of molluscs
Dissidocerida is an order of Early Ordovician to the Early Silurian orthoceratoid cephalopods in which the siphuncle has a continuous lining or a longitudinal
Dissidocerida
Geological formations in UK and Ireland
Group are geologic formations deposited during the Ludlow epoch of the Silurian period in the British Isles, in areas of England, Ireland, Scotland, and
Ludlow_Group
Gill-bearing non-tetrapod aquatic vertebrates
vertebrates appear in the Silurian, with giant armoured placoderms such as Dunkleosteus. Jawed fish, too, appeared during the Silurian: the cartilaginous Chondrichthyes
Fish
Last known individual of a species or subspecies
Latent extinction risk Living fossil Extinction events Major Ordovician–Silurian Late Devonian Permian–Triassic Triassic–Jurassic Cretaceous–Paleogene Holocene
Endling
Jaw of a polychaete annelid
diversified profusely in the Ordovician, and are most common in the Ordovician, Silurian and Devonian marine deposits of the Paleozoic era. Relatedly, more problematic
Scolecodont
mid-Silurian plants of the genus Cooksonia. However, thickened bands on the walls of isolated tube fragments are apparent from the early Silurian onwards
Evolutionary history of plants
Evolutionary_history_of_plants
Parasitic or predatory annelid worms
Mexico. In the 1980s, a fossil with external ring markings was found in Silurian strata in Wisconsin, and was originally identified as a leech, but assignment
Leech
Collection of individual local dances from Herefordshire, Worcestershire and Shropshire
people such as Dave Jones (late of Silurian Morris, founded 1969, and later the Not For Joes) and Keith Francis (of Silurian Morris) a distinctive border morris
Border_Morris
Bedrock unit in Pennsylvania, Maryland, West Virginia, and Virginia, US
The Silurian Tuscarora Formation — also known as Tuscarora Sandstone or Tuscarora Quartzite — is a mapped bedrock unit in Pennsylvania, Maryland, West
Tuscarora_Sandstone
Extinct genus of jawless fishes
Pteraspidomorpha, alongside a far more diverse group of jawless fish, the Silurian–Devonian heterostracans. Sacabambaspis is named after the village of Sacabamba
Sacabambaspis
or Formation Period Notes Akron Formation Silurian Anse Maranda Formation Cambrian Bear Creek Shale Silurian Becraft Limestone Devonian Beekmantown Group/Fort
List of fossiliferous stratigraphic units in New York
List_of_fossiliferous_stratigraphic_units_in_New_York
SILURIAN
SILURIAN
SILURIAN
SILURIAN
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Light Classical Melody
Boy/Male
Indian, Sanskrit
Lord of Yoga
Boy/Male
Tamil
Vishwesh | விஷà¯à®µà¯‡à®·Â
The Lord almighty
Male
German
Short form of German names beginning with Mein-, MEINO means "might, strength."
Female
English
Latin name first found in the medieval romance Amadis of Gaul, as the name of the king's daughter who married the Gaulish knight Amadis, possibly from the medieval Latin word oroana, ORIANA means "golden."Â
Boy/Male
Arabic, Muslim
Slave of the One who is Light
Biblical
weight
Boy/Male
Tamil
Light
Boy/Male
Hindu
Lord Vishnu
Boy/Male
Muslim
Problem solver
SILURIAN
SILURIAN
SILURIAN
SILURIAN
SILURIAN
n.
A kind of laminated shale or sandstone belonging to some of the layers of the Upper Silurian.
a.
Of or pertaining to the country of the ancient Silures; -- a term applied to the earliest of the Paleozoic eras, and also to the strata of the era, because most plainly developed in that country.
a.
Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
n.
The Silurian age.
n.
A fossil coral of the genus Heliolites, having twelve-rayed cells. It is found in the Silurian rocks.
a.
Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian.
n.
A genus of spiral gastropod shells, often of large size, characteristic of the lower Silurian rocks.
a.
Of, pertaining to, or designating, a subdivision of the Trenton Period of the Lower Silurian, characterized in the State of New York by beds of shale.
n.
Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment.
a.
Designating, or pertaining to, the series of rocks forming the Taconic mountains in Western New England. They were once supposed to be older than the Cambrian, but later proved to belong to the Lower Silurian and Cambrian.
n.
A Silurian fossil, formerly supposed to consist of eggs.
n.
A genus of Lower Silurian trilobites in which the glabella and cheeks form three rounded elevations on the head.