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#Ordovician

1 Beitrag1 Beteiligte*r0 Beiträge heute
Öffentlich *
Niels de Winter

Loving the discussion surrounding this @PNASNews publication on Phanerozoic #paleo #temperature evolution, one of the most interesting #paleoclimate discussions in my opinion.

pnas.org/doi/10.1073/pnas.2400

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.

pnas.org/doi/10.1073/pnas.2424

Antwortete im Thread
Öffentlich
llewelly

@futurebird
interview with the person who showed some anomalocaridids were filter-feeders:
palaeocast.com/episode-31-anom

interview with the person who found the specimen that preserved the big goofy eyes:
palaeocast.com/episode-36-emu-

good grief, both those interviews are over 10 years old!
#arthopods
#anomalocaridids
#Cambrian
#Ordovician
#fossils

www.palaeocast.comPalaeocast | Palaeontology podcastsPalaeontology podcasts
Öffentlich
Lukas VFN 🇪🇺

Gold bugs: New #fossil arthropod preserved in fool's gold phys.org/news/2024-10-gold-bug

A pyritized Ordovician leanchoiliid arthropod cell.com/current-biology/fullt

"#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)."

Life reconstruction of a prehistoric invertebrate animal
Öffentlich
Mikko Tuomi

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
astrobiology.com/2024/09/earth

Paper by Tomkins et sl. (2024):
sciencedirect.com/science/arti

Astrobiology · Earth May Have Had A Ring System 466 Million Years Ago - AstrobiologyEarth may have had a ring system, which formed around 466 million years ago
Öffentlich
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

#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.
nytimes.com/2024/09/20/science
archive.ph/gQCCa #space

An artist’s rendering of the Earth surrounded by a temporary ring of debris 466 million years ago
Öffentlich
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

#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."
phys.org/news/2024-09-earth-mi

Öffentlich *
joe•iuculano :mastodon:

Via #Salon @ 3:01pm EDT on Sept 20, 2024

Researchers have found evidence suggesting that the #Earth may have once had a system of #Saturn-like rings. The rings are theorized to have formed 466 million years ago during one of the coldest periods in the planet's history, known as the #Ordovician.

#Science #Astronomy

salon.com/2024/09/20/saturn-li

Salon.com · Saturn-like ring may have once encircled Earth, study findsResearchers found evidence of asteroid debris belt in our planet's early history
Öffentlich *
💧🌏 Greg Cocks

Earth May Have Had A Ring System 466 Million Years Ago
--
phys.org/news/2024-09-earth-mi <-- shared technical article
--
doi.org/10.1016/j.epsl.2024.11 <-- 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

graphic - close up of rocks / asteroids making up the rings around Saturn
maps - Areas of continental crust distal to the equator during the Ordovician. Areas older than Ordovician are indicated in salmon colour, Ordovician rocks are dark blue, and younger are in grey. Light blue indicates lakes in Africa. The labelled point (L) in Africa is the Luizi impact structure, which has a very poorly defined age that could plausibly be Ordovician, constrained to be between 0 and 573 Ma
map - Positions of the Ordovician impact craters on the reconstructed plate positions of the MER21 model, showing the movement of continents and trace of impact sites from 467 to 450 Ma. AMZ, Amazonia; ANT, Antarctica; AS, Arabian Shield; AUS, Australia; AZ, Azania; BAL, Baltica; IND, India; LAU, Laurentia; NC, North China; SA, Southern Africa; SAH, Saharah; SC, South China; SEA, South-eastern South America; SIB, Siberia; SSA, Southern South America; T, Tarim; WAF, West Africa.
maps - Areas of continental crust proximal to the equator during the Ordovician. Areas older than Ordovician are indicated in salmon colour, Ordovician rocks are dark blue, and younger are grey. Light blue indicates lakes in Europe and Russia. The labelled pink points are the recognised Ordovician impact spike craters: in Australia, Lawn Hill (LH); in North America, Tunnunik (T), Pilot (P), Lac Couture (LC), East Clearwater Lake (ECw), La Moinerie (LM), Charlevoix (Ch), Brent (B), Slate Islands (SI), Rock Elm (RE), Decorah (D), Calvin (Ca), Glasford (G), Ames (A); in Europe, Lochne (Lo), Malingen (M), Granby (G), Tvaren (T), Hummeln (H), Ilyinets (Iy) and Kardla (Ka) (the latter two are situated on the western edge of the map for Russia). The labelled black points are impact structures with very poorly defined ages that could plausibly be Ordovician in age (Parisi et al., 2024; Schmieder and Kring, 2020), but have not been included in [their] considerations: Goyder (Gy), Glikson (Gl), Matt Wilson (M), Woodleigh (W), Liverpool (L), Glover Bluff (GB), Crooked Creek (CC), Santa Fe (SF), Holleford (H), Île Rouleau (IR), Presqu’île (P), Lumparn (L), Saarijärvi (Sj), Summanen (Sm), Kamenetsk (K), Ramgarh (R).
Öffentlich
Lukas VFN 🇪🇺

500 million-year-old #fossil is the earliest branch of the #spiders' lineage arstechnica.com/science/2024/0

Lower #Ordovician synziphosurine reveals early euchelicerate diversity and evolution nature.com/articles/s41467-024

"Some of S. abundantis’ anatomical features allow for a deeper understanding of the early #evolution of #chelicerates and may even link other fossil forms, whose relationships are still highly debated, to this group"

photo of a fossil of a segmented invertebrate
Öffentlich
Lukas VFN 🇪🇺

#Discovery of the first ancestors of scorpions, spiders and horseshoe crabs phys.org/news/2024-05-discover

Lower #Ordovician synziphosurine reveals early euchelicerate diversity and #evolution nature.com/articles/s41467-024

"Measuring between 5 and 10 millimeters in size, it has been named #Setapedites abundantis. This animal makes it possible, for the first time, to trace the entire lineage of #chelicerates, from the appearance of the earliest #arthropods to modern #spiders, #scorpions and #HorseshoeCrabs"

Reconstruction of Setapedites abundantis. By Elissa Sorojsrisom. The animals look a little like trilobites. They are swimming above a sandy sea floor.
Öffentlich
Lukas VFN 🇪🇺

New #fossil site of worldwide importance uncovered in southern France phys.org/news/2024-02-fossil-s

The #CabrièresBiota (France) provides insights into Ordovician #polar ecosystems nature.com/articles/s41559-024

"In addition to shelly components, it contains extremely rare soft elements such as digestive systems and cuticles, in a remarkable state of preservation. Moreover, this biota was once located very close to the #SouthPole, revealing the composition of #Ordovician southernmost ecosystems."

Artistic reconstruction of the Cabrières Biota by Christian McCall. In the foreground, a row of Ampyx (trilobites) and various shelly organisms, including brachiopods and a hyolith (bottom left corner). Behind the trilobites, a lobopodian, a chelicerate, cnidarians (blue), sponges (green), thin branching algae (red and green) and hemichordate tubes (purple), along with some molluscs. Bivalved arthropods inhabit the water column along with graptolites.
Öffentlich
michael

9-FEB-2024
New fossil site of worldwide importance uncovered in southern France
Nearly 400 exceptionally well-preserved fossils dating back 470 million years have been discovered in the south of France by two amateur paleontologists.
eurekalert.org/news-releases/1 #science #evolution #paleontology #fossils #ordovician

EurekAlert!New fossil site of worldwide importance uncovered in southern France<p><strong>Nearly 400 exceptionally well-preserved fossils dating back 470 million years have been discovered in the south of France by two amateur paleontologists. This new fossil site of worldwide importance has been analyzed by scientists from the University of Lausanne, in collaboration with the CNRS and international teams. This discovery provides unprecedented information on the polar ecosystems of the Ordovician period.</strong></p>
Öffentlich
Lukas VFN 🇪🇺

Un zoo fossile d'un demi-milliard d'années lejournal.cnrs.fr/articles/un-

The #CabrièresBiota (France) provides insights into #Ordovician polar ecosystems nature.com/articles/s41559-024

"Un nouveau gisement de #fossiles découvert au pied de la montagne Noire, au sud du #MassifCentral, apporte un témoignage inédit sur la #biodiversité marine d’il y a un demi-milliard d’années."

In the foreground, a row of Ampyx (trilobites) and various shelly organisms, including brachiopods and a hyolith (bottom left corner). Behind the trilobites, a lobopodian, a chelicerate, cnidarians (blue), sponges (green), thin branching algae (red and green) and hemichordate tubes (purple), along with some molluscs. Bivalved arthropods inhabit the water column along with graptolites. By Christian McCall (Prehistorica Art).
Fortgeführter Thread
Öffentlich
Vickysaurus

My art in 2023 (2/12)

February: Orthocones Descend. Having moved into a new apartment and made a timeline covering the walls, the paleozoic looked awfully empty, so I made a big effort to expand my horizons and do art showing creatures I’d never drawn before. Showing orthocones descending vertically on their prey made for a fun composition too.

A watercolour painting showing an underwater scene looking upward. A large number of orthocones are descending through the water column. They are large cephalopods in long shells, swimming vertically. In the foreground, one of them is about to catch a trilobite, its beak opened and its tentacles ready to snatch it up.
#MyArt#paleoart#orthocone
Öffentlich
Lukas VFN 🇪🇺

Trilobites rise from the ashes to reveal ancient map
phys.org/news/2023-11-trilobit

#Trilobites of #Thailand's #Cambrian–#Ordovician Tarutao Group and their geological setting onlinelibrary.wiley.com/doi/10

"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."

Artist's rendering of a trilobite based on preserved soft body parts. By Nobu Tamura.
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