https://www.europesays.com/africa/459559/ Animals may have evolved 200 million years earlier than previously thought #AnimalOrigins #evolution #FossilPreservation #microfossils #MolecularClocks #Mongolia #Namibia #Neoproterozoic #NewDiscoveries #Paleontology #research #science #SnowballEarth #UniversityOfOxford
#neoproterozoic — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #neoproterozoic, aggregated by home.social.
-
Sea salt may have made Snowball Earth far colder than previously thought
Salt crystals left behind on extremely cold tropical sea ice may …
#NewsBeep #News #Science #albedofeedback #ancientEarth #AU #Australia #Climatechange #climatemodeling #Cryogenian #globalglaciation #GreenGoodNews #hydrohalite #Marinoanglaciation #Neoproterozoic #NewDiscoveries #PlanetaryScience #research #saltalbedo #seaice #seasalt #SnowballEarth #Sturtianglaciation #UniversityofTromsø
https://www.newsbeep.com/au/882608/ -
https://www.europesays.com/ie/483128/ Ancient Earth Repeatedly Thawed during Catastrophic Ice Ages, New Research Suggests #(planet) #Canada #CarbonDioxide #climate #ClimateChange #Earth #Éire #FranklinLargeIgneousProvince #Glaciation #GlobalWarming #Ice #IE #Ireland #Neoproterozoic #NorthAmerica #paleoclimate #Science #SnowballEarth #SturtianGlaciation #temperature
-
A Billion Years Are Mysteriously Missing From #Earth’s History. Now, We Know Why.
#TheGreatUnconformity — a gap in Earth’s #geologicalrecord. New research suggests it was created by shifting continents, rather than “#SnowballEarth” or #Cambrian life. Evidence that the gap was largely created by #tectonic processes that occurred from 2.1B to 1.6B years ago, in the #Neoproterozoic era, during the formation of an ancient supercontinent called Columbia
https://www.404media.co/great-unconformity-gap-geological-record-study-columbia/
https://archive.ph/glmuh -
Cryogenian (Geological periods 🌍)
The Cryogenian is a geologic period that lasted from 720 to 635 million years ago. It is the second of the three periods of the Neoproterozoic era, preceded by the Tonian and followed by the Ediacaran. The Cryogenian was a time of drastic climate changes. After the long environmental stability/stagnation during the Boring Billi...
https://en.wikipedia.org/wiki/Cryogenian
#Cryogenian #IceAges #Glaciology #Neoproterozoic #GeologicalPeriods #GeologyControversies
-
Tonian (Geological periods 🌍)
The Tonian is the first geologic period of the Neoproterozoic Era. It lasted from 1000 to 720 Mya. Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. The Tonian is preceded by the Stenian Period of the Mesoproterozoic Era and followed by the Cryogenian. Rifting leading to the breakup of supercontin...
https://en.wikipedia.org/wiki/Tonian
#Tonian #Neoproterozoic #GeologicalPeriods #ProterozoicGeochronology
-
@KateShaw has made a new episode, featuring goblet-shaped Diskagma of the Paleoproterozoic, and Horodyskia of the Mesoproterozoic and Neoproterozoic.
https://strangeanimalspodcast.blubrry.net/2025/08/04/episode-444-diskagma-and-horodyskia/
#fossils
#preCambrian
#proterozoic
#Paleoproterozoic
#Mesoproterozoic
#Neoproterozoic
#Ediacaran -
The term " #Neoproterozoic #fossil record " still feels odd, but this is just how our understanding has progressed.
Now, with the added layer of inhabited terrestrial #environments before #SnowballEarth.
(also, possibly a critical part of the #evolution of life, if you care about that sort of thing)
https://www.pnas.org/doi/abs/10.1073/pnas.2319628121 -
4-Oct-2024
Life on Earth was more diverse than classical theory suggests 800 million years ago, a Brazilian study showsAccording to an article published in the journal PNAS, different lineages of #amoebae and ancestors of #plants, #algae and animals were already established in the #Neoproterozoic period and survived the two glaciations that covered the entire planet.
-
Cryogenian (Geological periods 🌍)
The Cryogenian is a geologic period that lasted from 720 to 635 million years ago. It is the second of the three periods of the Neoproterozoic era, preceded by the Tonian and followed by the Ediacaran. The Cryogenian was a time of drastic climate changes. After the long environmental stability/stagnation during the Boring Billi...
https://en.wikipedia.org/wiki/Cryogenian
#Cryogenian #IceAges #Glaciology #Neoproterozoic #GeologicalPeriods #GeologyControversies
-
Ediacaran (Geological periods 🌍)
The Ediacaran is a geological period of the Neoproterozoic Era that spans 96 million years from the end of the Cryogenian Period at 635 Mya to the beginning of the Cambrian Period at 538.8 Mya. It is the last period of the Proterozoic Eon as well as the last of the so-called "Precambrian supereon", before the beginning of the subsequent Cambrian P...
https://en.wikipedia.org/wiki/Ediacaran
#Ediacaran #Neoproterozoic #GeologicalPeriods #ProterozoicGeochronology
-
Ediacaran (Geological periods 🌍)
The Ediacaran is a geological period of the Neoproterozoic Era that spans 96 million years from the end of the Cryogenian Period at 635 Mya to the beginning of the Cambrian Period at 538.8 Mya. It is the last period of the Proterozoic Eon as well as the last of the so-called "Precambrian supereon", before the beginning of the subsequent Cambrian P...
https://en.wikipedia.org/wiki/Ediacaran
#Ediacaran #Neoproterozoic #GeologicalPeriods #ProterozoicGeochronology
-
Ediacaran (Geological periods 🌍)
The Ediacaran is a geological period of the Neoproterozoic era that spans 96 million years from the end of the Cryogenian period at 635 Mya to the beginning of the Cambrian period at 538.8 Mya. It is the last period of the Proterozoic eon as well as the last of the so-called "Precambrian supereon", before the beginning of the subsequent Cambrian p...
https://en.wikipedia.org/wiki/Ediacaran
#Ediacaran #Neoproterozoic #GeologicalPeriods #ProterozoicGeochronology
-
Molecular fossils study sheds light on feeding strategy shift in ancient life https://phys.org/news/2023-12-molecular-fossils-strategy-shift-ancient.html
Common origin of sterol biosynthesis points to a feeding strategy shift in #Neoproterozoic animals https://www.nature.com/articles/s41467-023-43545-z
"these #phytosterol molecular #fossils record the rise of algae in ancient #oceans and #animals abandoned phytosterol production when they could easily obtain it from this increasingly abundant food source"
-
Now THAT is a conglomerate
Outcrop of the #Neoproterozoic Squantum Member of the Roxbury Conglomerate, #Boston Bay Group, Squantum Head
Formerly thought to be younger (Carboniferous) and glacial, these rocks are now known to be older and are interpreted (mostly) as debris flows rather than Gaskiers tillites. These are akin to the famous “puddingstone” conglomerates. There is also the lovely (actually Carboniferous) Pondville Conglomerate, just south of the Blue Hills & Boston Basin along I93.
-
A bizarre #sedimentary feature
Some layers in the #Neoproterozoic #Squantum Member of the #Roxbury #Conglomerate have been rolled up like a pie crust, into a tube. If this were a #tillite, as it once was thought to be, then it could have been caused by the drag of a #Gaskiers #glacier over the till. These rocks are mostly interpreted as deposited by submarine debris flows these days, in which case they could’ve been deformed during a slump and flow. Site of a field trip for #UMassBoston.
-
During what era did you join Mastodon?
#Cenozoic
#Mesozoic
#Paleozoic
#Neoproterozoic
#dinosaurs
#fossils -
A small #outcrop of the #Squantum Member of the #Roxbury #Conglomerate
These #rocks are in the #BostonBay Group, which is currently dated to #Neoproterozoic. The Squantum Member was interpreted as a #tillite, possibly associated with the #Gaskiers #glaciation, although there a scant signs like scratched pebbles or faceted cobbles. It is currently commonly interpreted as a #debrite (debris flow). Details in captions.
#geology #glacier #turbidite #Quincy #Boston #Massachusetts #NewEngland -
Anomalous pebble in layered #sedimentary #rock
An angular pebble is conformably surrounded by argillaceous and sandy layers in this #photograph of the #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate. The wide range of clast sizes led to an interpretation as a #glacial #tillite thru the 1970s, but the Squantum Member is now mostly interpreted as a #debrisFlow (#debrite or #turbidite). My #photo.
-
Deformed bedding in meta#sedimentary #rocks
The horizontal bedding of the #Squantum Member of the #Roxbury Conglomerate (#Neoproterozoic, #Boston Bay Group) has been disturbed locally.
In the #glacial #tillite interpretation of the Squantum (favored through at least the 1970s), the distortion might be caused by glaciotectonic drag at the ice base. The current interpretation as a #debrite or #turbidite would probably attribute the deformations to synsedimentary slumping. My #photo. #fieldTrip
-
Rapid changes in #clast size in #sedimentary #rocks
The #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate (#Boston Bay Group) transitions from sandstone, to almost-clast-supported conglomerate, to laminated argillite…in about 25 cm. Fifty years ago, it was interpreted as a #glacial deposit and called the Squantum #Tillite, presumably associated with the #Gaskiers Glaciation. Paucity of evidence (e.g., few scratches or faceted clasts) suggests a debris flow. My #photo.
-
Interbedded argillaceous & tuffaceous #sediments
These photos are of #Cambridge #Argillite, exposed above the #Squantum Member of the #Roxbury Conglomerate (#Neoproterozoic). Prior to the 1970s or so, the Squantum Member was interpreted as #glacial sediments; it's now broadly interpreted as debris flows, with the Cambridge being distal turbidites overlying it. I lead a field trip here for #UMassBoston. See captions.
#outcrop #fieldTrip #photo #rocks #tuff #Fufjilm #Venus 65mm #macro #Quincy
-
Geoscientists shed a light on life's evolution 800 million years ago
https://phys.org/news/2023-03-geoscientists-life-evolution-million-years.htmlNitrate limitation in early Neoproterozoic oceans delayed the ecological rise of eukaryotes https://www.science.org/doi/10.1126/sciadv.ade9647
Limited nitrate availability in early #Neoproterozoic oceans may have delayed the ecological rise of #eukaryotes until ~800 Ma when increased nitrate supply may have contributed to the transition from prokaryote-dominant to eukaryote-dominant marine ecosystems.
-
Fort Hill, #Roxbury Crossing, #Boston, #Massachusetts,#USA
Fort Hill is named for the fort (not this tower!) erected on it between the confrontation at Concord in April 1775 and British evacuation of Boston when Washington et al. moved guns onto #Dorchester Heights in March 1776 (independence “declared” in July 1776). The hill is capped by the Roxbury Conglomerate (#Neoproterozoic, ~600 Ma), which sports rakish #Pleistocene glacial striations. #history #geology #Fujifilm #glacial #NewEngland -
How Animals May Have Conquered #SnowballEarth https://eos.org/articles/how-animals-may-have-conquered-snowball-earth
Animal survival strategies in #Neoproterozoic ice worlds https://onlinelibrary.wiley.com/doi/full/10.1111/gcb.16393
Some modern #Antarctic inhabitants such as #anemones live upside down affixed to the underside of the sea ice. One of the favorite feeding strategies of #krill is grazing #microbes on this upturned plane. Perhaps early #animals foraged and found shelter in such locations, too.
-
Pleistocene glacial striations on Devonian and Neoproterozoic rock in New England. Savin Hill, Middlesex Fells, and Mt Monadnock. See captions for details.
#rocks #glaciology #Boston #MiddlesexFells #MountMonadnock #sedimentary #Medford #Neoproterozoic #Devonian #Pleistocene
-
Last set of examples of soft sediment deformation in the. Squantum Member of the Roxbury Conglomerate, Boston Bay Group; Neoproterozoic and approximately contemporaneous with Gaskiers glaciation.
Although previously interpreted as a tillite (it is still sometimes referred to as the “Squantum Tillite), the “consensus” is now debris flows and turbidites.
#geology #sedimentology #turbidites #glaciology #Boston #Neoproterozoic #geosciences #sedimentary #rocks
-
Possible dropstone in the Neoproterozoic Squantum Member of the Roxbury Conglomerate, Quincy, Massachusetts USA. See previous posts for more background.
#geology #glaciology #turbidites #Neoproterozoic #sedimentary #conglomerate #rocks -
Learning about the first animals from life at the poles https://www.bas.ac.uk/media-post/learning-about-the-first-animals-on-earth-from-life-at-the-poles/
Paper: Animal survival strategies in #Neoproterozoic ice worlds https://onlinelibrary.wiley.com/doi/full/10.1111/gcb.16393
The amazing survival strategies of polar marine creatures might help to explain how the first #animals on Earth could have evolved earlier than the oldest #fossils. These first, simple and now extinct, animals might have lived through some of the most extreme, cold and icy periods the world has ever seen.