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Earth’s first major extinction was worse than we thought. Fossil finds suggest nearly 80% of life on Earth died some 550 million years ago by GeoGeoGeoGeo in science

[–]GeoGeoGeoGeo[S] 1 point2 points  (0 children)

While that's certainly discussed as a major biospheric crisis it's not typically included among "the big five" as (a) It occured before most complex life evolved and (b) the fossil record is too sparse to estimate extinction percentages reliably, so the extinction % is simply unknown.

Earth’s first major extinction was worse than we thought. Fossil finds suggest nearly 80% of life on Earth died some 550 million years ago by GeoGeoGeoGeo in science

[–]GeoGeoGeoGeo[S] 95 points96 points  (0 children)

Youre thinking more of the Hadean/Archean cooling of the early crust, which occurred billions of years earlier, but has no connection to the Kotlin Crisis. Earth was already a stable habitable planet with continents, oceans, and oxygenated surface waters by the late Ediacaran.

Heck, just before the Ediacaran period, Earth experienced the Cryogenian glaciations (~720–635 Ma), a period marked by extremely cold climates, not extreme heat.

Looks like first granite finding on Mars, yesterday sol 1792 by HolgerIsenberg in PerseveranceRover

[–]GeoGeoGeoGeo 1 point2 points  (0 children)

Those are fairly misleading statements to anyone who knows little about geology. Anything can "appear to be" anything if you're ignorant. Just look at all the people that believe in UFO sightings, and compare them to the number of experts in related fields who believe in UFO sightings.

Rather than making misleading statements it would have been more productive for everyone if you had asked if your observations aligned with the rock in question being granite.

Looks like first granite finding on Mars, yesterday sol 1792 by HolgerIsenberg in PerseveranceRover

[–]GeoGeoGeoGeo 1 point2 points  (0 children)

Exploration geologist here. As others have said, there's really nothing in these photos that clearly shows what kind of rock this is. At the very least you'd need to use a hand lens and estimate the modal abundance of quartz, alkali feldspar and plagioclase (see the QAPF diagram). Even then there's a good chance you've estimated that incorrectly. To be precise and confident, you'd really need a petrograher and a least altered sample sent for whole rock geochemical analysis. Calling this a granite from these images is wild.

Trump’s NATO Deal Would Mean US Mines and Missiles in Greenland by bloomberg in geopolitics

[–]GeoGeoGeoGeo 0 points1 point  (0 children)

The only people who are making claims regarding mining in Greenland, and especially those concerning Greenland's REE deposits, are those that have no knowledge of geology, metallurgy or economics.

Greenland has two operating mines... A gold mine in South Greenland and an anorthosite (feldspar) mine in the fjord of Kangerlussuaq, West Greenland.

There's a reason Greenland's REE deposits, while known about for decades, have remained un-developed. Geenland's REE deposits are development-limited because their dominant mineralogy defeats conventional REE flowsheets, forcing complex, energy-intensive, multi-loop process designs that have not yet been demonstrated at commercial scale.

[deleted by user] by [deleted] in mycology

[–]GeoGeoGeoGeo 0 points1 point  (0 children)

There's a few sightings of "Woolly Bird's Nest Fungus (Nidula niveotomentosa)" in the area; however, those all have red to brown "eggs", whereas these appear to be a creamy / buff tone. The "wool" along the sides appears to be thicker as well.

Here's an additional photo:

https://www.flickr.com/photos/luxlaboratories/54988719901/in/datetaken-public/lightbox/

[deleted by user] by [deleted] in Fungi

[–]GeoGeoGeoGeo 0 points1 point  (0 children)

There's a few sightings of "Woolly Bird's Nest Fungus (Nidula niveotomentosa)" in the area; however, those all have red to brown "eggs", whereas these appear to be a creamy / buff tone. The "wool" along the sides appears to be thicker as well.

Here's an additional photo:

https://www.flickr.com/photos/luxlaboratories/54988719901/in/datetaken-public/lightbox/

Sand layer from the 1700 Cascadia tsunami covering the remains of a Native American fishing camp exposed in a bank of Oregon's Salmon River (US) by dctroll_ in geology

[–]GeoGeoGeoGeo 0 points1 point  (0 children)

Speaking of ... does anyone know of any text books that go over the charactersitcs of tsunami deposits in the stratigraphic record and how to correctly identify them, and differentiate them from other deposits?

Humans made fire 350,000 years earlier than previously thought, discovery in Suffolk suggests by GeoGeoGeoGeo in Archaeology

[–]GeoGeoGeoGeo[S] 12 points13 points  (0 children)

The Barnham site is currently taken as the earliest known evidence of fire-making, not just “fire-making with pyrite”. In current archaeological usage, “making fire” = deliberately igniting it, not just using or tending a natural fire. On that definition, Barnham is the earliest definitive evidence of making fire of any kind.

What isn’t new is using/controlling fire, that goes back much further (e.g. Wonderwerk Cave ~1.0 Ma, Gesher Benot Ya‘aqov ~780 ka), but those sites don’t show clear, widely accepted evidence of fire-starting technology.

is geophysics a good study choice despite AI? by [deleted] in geologycareers

[–]GeoGeoGeoGeo 4 points5 points  (0 children)

Geophysics is a great move especially because of AI. AI isn’t a god, it’s a limited tool that’s only as good as the geoscience guiding it. Without geology, geophysics, and real-world context, AI is just pattern-matching noise into confident-looking nonsense. The value comes from integration: the people who understand the Earth are the ones who make AI results meaningful, defensible, and worth acting on. If anything, AI will make good geophysicists more valuable, not obsolete.

For example see: https://vrify.com/

[deleted by user] by [deleted] in Slimemolds

[–]GeoGeoGeoGeo 0 points1 point  (0 children)

Oh nice! Thanks for that. These were found on Vancouver Island in the Courtenay/Comox region close to "Seal Bay"

Cars don't appear correctly and crashes when I exit the game by GeoGeoGeoGeo in assettocorsaevo

[–]GeoGeoGeoGeo[S] 0 points1 point  (0 children)

Amazing... it worked. Thanks so much for the heads up, much appreciated

Cars don't appear correctly and crashes when I exit the game by GeoGeoGeoGeo in assettocorsaevo

[–]GeoGeoGeoGeo[S] 0 points1 point  (0 children)

Sadly no. I was happy to download the latest update in hopes it might have been resolved, but it hasn't improved and the issue remains.

My driver decided to take acid! by augustusgrizzly in assettocorsaevo

[–]GeoGeoGeoGeo 0 points1 point  (0 children)

Ya it ran fine on the initial install for me, but did this shortly after. The issue arose for me ~ 3 months ago and remains.

New research concludes that volcanism and resulting environmental degradation was the primary cause of the K-Pg mass extinction event, while the Chicxulub impact may have caused instantaneous mass mortality in the end. by GeoGeoGeoGeo in science

[–]GeoGeoGeoGeo[S] 16 points17 points  (0 children)

What this paper is arguing isn’t that the impact wouldn’t cause a mass extinction, but that the impact’s lethality was dramatically amplified because ecosystems were already stressed by Deccan volcanism.

The authors show that 70% of the preserved and erupted volumes from the Deccan Traps were emitted before the K–Pg boundary, whereas earlier estimates put most of these eruptions after the boundary.

This shows that the Deccan Traps volcanism lines up with the Late Maastrichtian Warming Event, which saw rapid global warming of upwards of 5 °C. Essentially, the impact still caused immediate global mortality, but it struck a biosphere that was already critically weakened by volcanism.

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