#ordovician — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #ordovician, aggregated by home.social.
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Prague metro construction leads to discovery of new prehistoric species https://english.radio.cz/prague-metro-construction-leads-discovery-new-prehistoric-species-8885616
A new species of Soomaspis (Naraoiidae) from the Upper #Ordovician of Bohemia http://www.geology.cz/bulletin/contents/art1955
"the most surprising aspect of the find is that its closest known relative was previously identified only in southern Africa... Much of #Prague stands on rock formations dating back to the #Paleozoic era, between 541 and 252 million years ago."
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Prague metro construction leads to discovery of new prehistoric species https://english.radio.cz/prague-metro-construction-leads-discovery-new-prehistoric-species-8885616
A new species of Soomaspis (Naraoiidae) from the Upper #Ordovician of Bohemia http://www.geology.cz/bulletin/contents/art1955
"the most surprising aspect of the find is that its closest known relative was previously identified only in southern Africa... Much of #Prague stands on rock formations dating back to the #Paleozoic era, between 541 and 252 million years ago."
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Prague metro construction leads to discovery of new prehistoric species https://english.radio.cz/prague-metro-construction-leads-discovery-new-prehistoric-species-8885616
A new species of Soomaspis (Naraoiidae) from the Upper #Ordovician of Bohemia http://www.geology.cz/bulletin/contents/art1955
"the most surprising aspect of the find is that its closest known relative was previously identified only in southern Africa... Much of #Prague stands on rock formations dating back to the #Paleozoic era, between 541 and 252 million years ago."
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Prague metro construction leads to discovery of new prehistoric species https://english.radio.cz/prague-metro-construction-leads-discovery-new-prehistoric-species-8885616
A new species of Soomaspis (Naraoiidae) from the Upper #Ordovician of Bohemia http://www.geology.cz/bulletin/contents/art1955
"the most surprising aspect of the find is that its closest known relative was previously identified only in southern Africa... Much of #Prague stands on rock formations dating back to the #Paleozoic era, between 541 and 252 million years ago."
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https://www.europesays.com/ie/447232/ 450-Million-Year-Old Fossils Reveal Strange, Tube-Dwelling Jellyfish Relative #Canada #Éire #fossil #IE #Ireland #jellyfish #Medusozoa #NeuvilleFormation #NorthAmerica #Ordovician #Paleocanna #PaleocannaTentaculum #Polyp #quebec #Science #Tentacle
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Entre el Ordovícico medio y el Pérmico tardío (486-251 MdA), en el océano podían verse corales rugosos que podían crecer hasta un metro de longitud en forma de cuerno y se alimentaban del plancton. 🏛️Museo Carnegie de Historia Natural 📷James St. John #ordovícico #ordovician
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14-Jan-2026
Tiny Titans of Recovery - Ancient traces reveal minute fossil life in #SouthAfrica’s Cederberg mountains
UCT-led study uncovers #fossil #ecosystem that helped kick-start life after global catastrophe^at the end of the #Ordovician, ie 444 million years ago
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El Nimchacystis agterbosi es un homalozoo de la clase soluta del Ordovícico inferior (487-471 MdA) que, si se considera un equinodermo, precedería a aquellos con simetría radial o sería un taxón que la habría perdido. 📷Christophe Dupichaud #ordovicico #ordovician
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En las aguas del Cámbrico superior al Ordovícico temprano nadaba el Falciscaris mumakiana, un radiodonto húrdido que podía superar el metro de longitud. Sus grandes y robustos apéndices frontales, por lo único por lo que se le conoce, podrían haberle servido para capturar grandes presas del fondo marino.📷Joschua Knüppe #cambrico #cambrian #ordovicico #ordovician
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En 1698 se descubrió el primer trilobite, el Ogygiocarella debuchii, pero entonces se creyó que se trataba de un pez plano. 📷Micktherocktapper #trilobite #ordovicico #ordovician
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A #Dilophosaurus studied from the gorgeous, terrifying Hunted by Moonlight Dinosauria episode and a #Boedaspis trilobite!
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El Panderodus unicostatus fue un pez sin mandíbula, como las lampreas, que vivió desde el Ordovícico medio al Devónico tardío (470-359 Mda). Sus elementos, unas piezas mineralizadas similares a dientes, habrían permitido agarrarse a su presa. Dado que los conodontos poseen los "dientes" más afilados que se conocen, debieron ser temibles. Además, serían tóxicos para otros depredadores. 📷Prehistorica #ordovicico #ordovician #devonico #devonianv
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Ordovician (Geological periods 🌍)
The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordovician spans 41.6 million years from the end of the Cambrian Period 486.85 Ma to the start of the Silurian Period 443.1 Ma. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charle...
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Quite a bit of #Chrysotile was extracted from the Jeffrey Mine, Quebec. It is located on a line of oceanic lithosphere attached to North America during the growth of the Appalachians.
The town of Asbestos, home of the mine, has been renamed 'Val-des-Sources'.
Much of the expense of renovating buildings in Quebec is the cost of removing the asbestos insulation.
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Ordovician (Geological periods 🌍)
The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordovician spans 44 million years from the end of the Cambrian Period 487 Ma to the start of the Silurian Period 443 Ma. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapwo...
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El trilobite Megistaspidella triangularis vivió en el Ordovícico inferior (485 MdA). Se distingue principalmente por su cefalón en forma de cuña. Como muchos trilobites asáfidos eran nectobentónicos, es decir, nadaban por encima y en el fondo marino, pudo ser una forma hidrodinámica o que le facilitara esconderse excavando, manteniendo fuera sus ojos.📷Ghedoghedo #trilobite #ordovicico #ordovician
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Arandaspis prionotolepis es un pez sin mandíbula del Ordovícico (480-470 MdA) es uno de los primeros vertebrados. Estaba cubierto de escudo, se habría alimentado por filtración y se desconoce cómo habrían sido sus aletas. 📷Petr Menshikov #ordovicico #ordovician
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Three new #Ordovician sponges, including a new #species, have been discovered in the reef mounds of western Argentina!
This new paper details the first attempt of these groups to invade reef environments, setting the stage for future success in the Mesozoic.
Image: Modified from Figure 4 from the paper. Detailed views of thin sections of Niquivilispongia asteria gen. et sp. nov. For A, B, and D, the scale bar equals 0.5 mm. For C, E, and F, the scale bar equals .2 mm.
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El trilobite Asaphus kowalewski vivió en el Ordovícico. Se distingue por sus ojos pedunculados, compartido por muchas especies de su hábitat. Probablemente se enterraran o vivieran en aguas turbias. #trilobite #ordovicico #ordovician
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El Hoplolichas plautini fue un trilobite del Ordovícico medio cubierto de espinas pero su género, junto con Hoplolichoides y Otarozoum, se diferencia por la gran espina occipital. La diferencia con estos dos géneros es que tiene una sola espina central, siendo una especie de unicornio trilobite. 📷Uncle Darwin #trilobite #ordovicico #ordovician
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Los trilobites del género Sphaerocoryphe, que vivieron entre el Ordovícico medio y el Silúrico, tienen una enorme glabela bulbosa. 📷Skye McDavid #trilobite #ordovicico #ordovician #silurico #silurian
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Loving the discussion surrounding this @PNASNews publication on Phanerozoic #paleo #temperature evolution, one of the most interesting #paleoclimate discussions in my opinion.
https://www.pnas.org/doi/10.1073/pnas.2400434121
Critique: 6-10 degrees #tropical #ocean #temperatures during the #Ordovician seem very low to me, especially considering that in this time (450 million years ago) corals were thriving. The critical comment by Ethan Grossman and colleagues therefore seems fitting.
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"Something much worse than asteroids" is hype: the late-#Devonian and end-#Ordovician were less severe that the end-#Cretaceous, which was definitely† caused by an #asteroid. But this is good work that may help nail down the cause of the earlier #extinctions ... which were still pretty bad!
†Yes.
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En una época muy, muy lejana, allá por el Ordovícico medio (470-458 MdA)...este Han solo no disparó primero. Primero, porque no tiene ni ojos y, segundo, porque se trata de un trilobite agnóstido, aunque se cuestiona que este orden pertenezca realmente a los trilobites. Los segmentos torácicos estrechos entre el céfalon y pigidio permitiría que se cerrara como un bivalvo. 📷Traheripteryx #trilobite #ordovicico #ordovician
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@futurebird
interview with the person who showed some anomalocaridids were filter-feeders:
https://www.palaeocast.com/episode-31-anomalocaridids/interview with the person who found the specimen that preserved the big goofy eyes:
https://www.palaeocast.com/episode-36-emu-bay-shale/good grief, both those interviews are over 10 years old!
#arthopods
#anomalocaridids
#Cambrian
#Ordovician
#fossils -
Gold bugs: New #fossil arthropod preserved in fool's gold https://phys.org/news/2024-10-gold-bugs-fossil-arthropod.html
A pyritized Ordovician leanchoiliid arthropod https://www.cell.com/current-biology/fulltext/S0960-9822(24)01367-8
"#Megacheirans like Lomankus were very diverse during the #Cambrian Period (538–485 million years ago) but were thought to be largely extinct by the #Ordovician Period (485–443 million years ago)."
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Earth may have had a #ring during the middle #Ordovician, some 466 million years ago.
Breakup of an #asteroid passing within Earth's Roche limit likely formed the ring.
Among several features preserved is a near-equatorial band of impact craters.
Shading of Earth by the ring may have triggered a global icehouse period.
#astronomy
https://astrobiology.com/2024/09/earth-may-have-had-a-ring-system-466-million-years-ago.htmlPaper by Tomkins et sl. (2024):
https://www.sciencedirect.com/science/article/pii/S0012821X24004230 -
#Earth Had a Ring 466 Million Years Ago, Study Says
Impact craters found around the Earth that were made around the same time could be linked to debris falling from a ring, a new study suggests.
The study links an uptick in impact craters during the #Ordovician Period, an era before animals lived on land, to a ring made of #asteroid debris that encircled our planet for millions of years.
https://www.nytimes.com/2024/09/20/science/earth-rings-asteroids-ordovician.html
https://archive.ph/gQCCa #space -
"Rapid rates of sea level rise, deglaciation, and increased marine deoxygenation are hallmarks of modern climate change. O2 contents have declined by at least 2% over the past 50 years, and models predict continued declines by as much as 7% over the next century"
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Rapid fluctuations in oxygen levels coincided with Earth's first mass extinction
https://phys.org/news/2022-11-rapid-fluctuations-oxygen-coincided-earth.htmlRapid marine #oxygen variability: Driver of the Late #Ordovician mass #extinction https://www.science.org/doi/10.1126/sciadv.abn8345
By measuring #isotopes of the element #thallium—which shows special sensitivity to changes in oxygen—they found that previously documented patterns of this #MassExtinction coincided with an initial rapid decrease in marine oxygen levels followed by a rapid increase.
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Model shows fall in ancient sea surface temperatures likely led to Great Ordovician Biodiversification
https://phys.org/news/2023-10-fall-ancient-sea-surface-temperatures.htmlImpact of global #climate cooling on #Ordovician marine biodiversity https://www.nature.com/articles/s41467-023-41685-w
"prior to the #GreatOrdovicianBiodiversification, #OceanTemperatures were too warm to support much diversity, particularly in the tropics—most such #SeaLife would have lived around the poles. But as the sea cooled, species would have moved toward the equator"
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Earth May Have Had A Ring System 466 Million Years Ago
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https://phys.org/news/2024-09-earth-million-years.html <-- shared technical article
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https://doi.org/10.1016/j.epsl.2024.118991 <-- shared paper
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“HIGHLIGHTS:
• Earth may have had a ring during the middle Ordovician, from ca. 466 Ma.
• Breakup of an asteroid passing within Earth's Roche limit likely formed the ring.
• Among several features preserved is a near-equatorial band of impact craters.
• Shading of Earth by the ring may have triggered a global icehouse period…”
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#GIS #spatial #mapping #model #modeling #geology #structuralgeology #planetarygeology #rings #climatechange #paleoclimate #Ordovician #asteroid #rochelimit #craters #impactcrater #crater #icehouse #meteorite #platetectonics #HirnantianIcehouse -
#UtrechtUniversity #EarthSystemScience #Geology
One more Friday early-career presenter at the #Goldschmidt2023 conference #Lyon:*Alissa J Kotowski* (Utrecht University)
Low-temperature plate boundary serpentinization post-dates subduction initiation and facilitates obduction of an Appalachian ophioliteSession 4fO2 09:30 CEST
Field work at Mont Albert, Gaspé Peninsula, #Quebec done while at #McGillUniversity. #Ordovician #TaconicOrogeny
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Trilobites rise from the ashes to reveal ancient map
https://phys.org/news/2023-11-trilobites-ashes-reveal-ancient.html#Trilobites of #Thailand's #Cambrian–#Ordovician Tarutao Group and their geological setting https://onlinelibrary.wiley.com/doi/10.1002/spp2.1516
"During the trilobites' lifetime, this region was on the outer margins of #Gondwanaland, an ancient #supercontinent that included Africa, India, Australia, South America, and Antarctica."
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Quincy or #BlueHills #Porphyry #Granite
An alkaline, nonorogenic granite intruded into #Avalonia in the #Silurian / #Ordovician as it cruised from peri-#Gondwana to #Laurentia, before assembling #Pangea in the #Acadian #Orogeny (#Devonian). It’s coarse, with the #phenocrysts of amphiboles(?) (possibly riebeckite?)…I’m no petrologist. From@the Eaton’s Pond conservation area@at the #Braintree #Quincy border. My photos.
#geology #igneous #Massachusetts #Boston #NewEngland #Fujifilm #photo -
Five-Eyed, Nozzle-Nosed Oddity Lingered Far beyond the #Cambrian Period https://www.scientificamerican.com/article/five-eyed-nozzle-nosed-oddity-lingered-far-beyond-the-cambrian-period/ by Riley Black
#Ordovician opabiniid-like #animals and the role of the #proboscis in #euarthropod head evolution https://www.nature.com/articles/s41467-022-34204-w
Joanna Wolfe: "We have more questions now about how #opabiniids may have survived and what kinds of environments or life histories they were restricted to."
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#Welsh 'weird wonder' #fossils add piece to puzzle of #arthropod #evolution https://phys.org/news/2022-11-welsh-weird-fossils-piece-puzzle.html
#Ordovician #opabiniid-like animals and the role of the #proboscis in #euarthropod head evolution https://www.nature.com/articles/s41467-022-34204-w
A proboscis—thought to represent a fused pair of head appendages—was not unique to #opabiniids, but instead was present in the common ancestor of #radiodonts and modern #arthropods, and through evolutionary time may have reduced to become the labrum of modern arthropods.
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450-480 million years ago, this sea lily was alive on the seabed. I doubt that I will have that kind of longevity.
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There’s been no doubt for some time that we’re in the middle of a sixth #mass #extinction. Here are some numbers.
If we’re very lucky, we’ll stop at the level of the #Devonian extinction, the least severe of the Big Five. More likely we’re headed for something on the scale of the #Ordovician or #Triassic. The #Cretaceous is in sight, and the #Permian is not out of reach. From an evolutionary time perspective it will look like the Cretaceous, practically as instantaneous as the Big Rock.
I confess, I really like the idea of #corvid #paleontologists digging up the #Anthropocene. Feathers gleaming under badlands dust, exciting cawing as dextrous claws scrape rock away from a flat-faced skull … But I’m very much not okay with what we’re doing right now to make that happen.
Pop-sci coverage: https://www.forbes.com/sites/grrlscientist/2023/07/19/modern-sixth-mass-extinction-event-will-be-worse-than-first-predicted/
Journal article, open access: https://onlinelibrary.wiley.com/doi/10.1111/brv.12974
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Trilobites rise from the ashes to reveal ancient map
https://phys.org/news/2023-11-trilobites-ashes-reveal-ancient.html#Trilobites of #Thailand's #Cambrian–#Ordovician Tarutao Group and their geological setting https://onlinelibrary.wiley.com/doi/10.1002/spp2.1516
"During the trilobites' lifetime, this region was on the outer margins of #Gondwanaland, an ancient #supercontinent that included Africa, India, Australia, South America, and Antarctica."
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Trilobites rise from the ashes to reveal ancient map
https://phys.org/news/2023-11-trilobites-ashes-reveal-ancient.html#Trilobites of #Thailand's #Cambrian–#Ordovician Tarutao Group and their geological setting https://onlinelibrary.wiley.com/doi/10.1002/spp2.1516
"During the trilobites' lifetime, this region was on the outer margins of #Gondwanaland, an ancient #supercontinent that included Africa, India, Australia, South America, and Antarctica."
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Trilobites rise from the ashes to reveal ancient map
https://phys.org/news/2023-11-trilobites-ashes-reveal-ancient.html#Trilobites of #Thailand's #Cambrian–#Ordovician Tarutao Group and their geological setting https://onlinelibrary.wiley.com/doi/10.1002/spp2.1516
"During the trilobites' lifetime, this region was on the outer margins of #Gondwanaland, an ancient #supercontinent that included Africa, India, Australia, South America, and Antarctica."
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Trilobites rise from the ashes to reveal ancient map
https://phys.org/news/2023-11-trilobites-ashes-reveal-ancient.html#Trilobites of #Thailand's #Cambrian–#Ordovician Tarutao Group and their geological setting https://onlinelibrary.wiley.com/doi/10.1002/spp2.1516
"During the trilobites' lifetime, this region was on the outer margins of #Gondwanaland, an ancient #supercontinent that included Africa, India, Australia, South America, and Antarctica."
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#FossilAdventCalendar Day 19
It's appropriate that this #MarineLifeMonday our journey #north reaches the shores of #Hudson'sBay at #Churchill, #Manitoba 🇨🇦. It's here that the largest complete #trilobite #fossil ever found was uncovered from #Ordovician rocks. If you want to see the more than two foot long Isotelus rex in person, head to #Winnipeg's #ManitobaMuseum, where it's displayed in all its splendor.
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Parasite-induced shell damage in brachiopod Porambonites (Porambonites) laticaudata from the Late #Ordovician (Sandbian) of #Estonia
https://doi.org/10.3176/earth.2023.23
The pits in the shell margin are most likely caused by the presence of symbionts which benefitted from inhalant currents and caused damage to the host #brachiopod. This is consistent with #parasitism rather than previously know damage linked with failed attacks by durophagous #predators.
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Los Lituites eran unos nautiloides del Ordovícico medio tenían una concha cónica recta salvo en el extremo, donde se curvaba. Están relacionados taxonómicamente con los nautilinos que aún existen, cuya concha es una espiral completa.📷Franz Anthony #ordovicico #ordovician
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El Pentecopterus decorahensis es el euriptérido o escorpión marino más antiguo, viviendo hace 467,3 MdA, en el Ordovícico medio. También es uno de los más grandes, con 1,7 m de longitud. #ordovicico #ordovician
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El trilobite Gabriceraurus dentatus, como su género y los del género Ceraurus, tiene dos largas espinas pigidiales, es decir, las púas que forman una media luna en el pigidio, como se llama la zona posterior. Como otros trilobites, puede enroscarse, por lo que no siempre es visible en los fósiles. Vivió en el Ordovícico superior, hace 458-445 MdA. #trilobite #ordovicico #ordovician
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Si hay pez espada, ¿por qué no podría haber trilobite espada? El Probolichas kristiae del Ordovícico superior (458-443 MdA) tenía un apéndice alargado de uso desconocido. Podría haberlo usado para cazar, defenderse o ser útil en la selección sexual. 🏛️Museo Americano de Historia Natural #trilobite #ordovicico #ordovician
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El Thoralicystis es la prueba de que los "alienígenas" vivieron en el pasado, pero no construyendo pirámides, sino en un entorno primigenio donde desarrollaron una anatomía ajena a los esquemas a los que estamos acostumbrados. 📸Rich Mooi #ordovicico #ordovician