Live and recent posts from across the Fediverse tagged #ordovician, aggregated by home.social.
#EarlyCareer presentor at GSA Connects:
Wednesday, 14Oct, 02:25 PM
Bluebird Ballroom 2E
Dr. Morgann Perrot, McGill University
"From Outcrop to Model: Integrating Field Mapping, Geophysics, and Geochemistry For Urban Subsurface Characterization in Montréal"
Field observations shown to be essential to interpreting modern geochemical and geophysical data on the nature of the subsurface in an urban area.
#GSAConnects2026 #McGillUniversity #Montreal #Ordovician #ExtensionalTectonics
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 43.75 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 Char...
#bryozoans helped form reefs on the #ordovician ocean floor other animals including #cephalopod mollusk also visible in this slab lived in these reef communities when they died skeletons
Today I visited the Langness Peninsula on the #IsleofMan to see one of the best displayed angular unconformities in the UK. It separates near vertical muds/turbiditic silts/VF sands of the #Ordovician #Manx Group from gently dipping alluvial fan conglomerates of the basal Lower Carb., a time gap of perhaps 130 million years. It's closely anomalous to the famous Hutton's Unconformity as shown at Siccar Point in Scotland but strangely this fantastic equivalent is barely known. #geology
Entomologists Reconstruct Evolutionary History of Millipedes
Two elusive groups of millipedes, Siphoniulida and Siphonocryptida, were the last missing pieces in the evolutionary history of…
#NewsBeep #News #Science #AU #Australia #dna #Evolution #Gene #Genome #Hirudicryptus #Hirudicryptuscanariensis #Millipede #Ordovician #Siphoniulida #Siphoniulus #Siphoniulusneotropicus #Siphonocryptida
https://www.newsbeep.com/au/736151/
It's been a while since I posted something for #FossilFriday !
This time I present Ordosoceras sphaeriforme from the #Ordovician of China, an actinoceratid #cephalopod with one of the strangest siphuncles I know. Compare this to modern #Nautilus !
#trilobites selenopelitis buchii #ordovician 490 443 million years ago morocco— with Field Museum at Field Museum.
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."
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
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
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
The Age of Fishes began with mass death, fossil database reveals https://phys.org/news/2026-01-age-fishes-began-mass-death.html
#MassExtinction triggered the early radiations of jawed vertebrates and their jawless relatives https://www.science.org/doi/10.1126/sciadv.aeb2297
"from this biological havoc, known as the Late #Ordovician Mass #Extinction, came an unprecedented richness of vertebrate life. One group came to dominate all others, putting life on the path to what is known today as jawed #vertebrates... they only became dominant because this happened"
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
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
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
A #Dilophosaurus studied from the gorgeous, terrifying Hunted by Moonlight Dinosauria episode and a #Boedaspis trilobite!
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
New #Ordovician #fossils available. Specimens include hash plates, bulk brachiopods, and more.
These contain crinoids, trilobites, gastropods, corals, bryzoans, and other unidentified bits. Unprepped.
Link : https://galactic-stone.com/search.php?search_query=ordovician
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...
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.
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...
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
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
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.
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
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
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
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.
"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.
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
@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)."
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.html
Paper 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
#Earth may have had a ring system that formed around 466 million years ago, at the beginning of a period of unusually intense #meteorite bombardment known as the #Ordovician impact spike.
"Over millions of years, material from this ring gradually fell to Earth, creating the spike in meteorite impacts observed in the geological record," author Andy Tomkins. "We also see that layers in sedimentary rocks from this period contain extraordinary amounts of meteorite debris."
https://phys.org/news/2024-09-earth-million-years.html
Earth May Have Had A Ring System 466 Million Years Ago
--
https://phys.org/news/2024-09-earth-million-years.html <-- shared technical article
--
https://doi.org/10.1016/j.epsl.2024.118991 <-- shared paper
--
“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…”
--
#GIS #spatial #mapping #model #modeling #geology #structuralgeology #planetarygeology #rings #climatechange #paleoclimate #Ordovician #asteroid #rochelimit #craters #impactcrater #crater #icehouse #meteorite #platetectonics #HirnantianIcehouse
This is a wild but convincing argument for Earth having had a temporary ring half a billion years ago, and it being the source for most of the identified crater remnants in #Sweden 🤯
Tomkins et al: "Evidence suggesting that earth had a ring in the #Ordovician"
https://www.sciencedirect.com/science/article/pii/S0012821X24004230
h/t @asrivkin
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