Discover and read the best of Twitter Threads about #geology

Most recents (24)

FIRST UP: #1 ranked Saber-Toothed Anchovy (Monosmilus chureloides) Vs. #16 ranked Planktonic Copepod (Cyclops bicuspidatus). Tonight's battle brought to you by @MarcKissel and me! #2021MMM
Planktonic Copepod are zooplankton, a large group of organisms whose name means "animal drifter". They can be found in almost every body of water. #2021MMM Image by MarekMiś, CC BY 4.0 via Wikimedia Commons Cyclops - one of the copepod representatives . MarekMiś, CC
To give you some idea of the diversity here, there are ~ 13,000 species of copepods ("oar-feet") plankton alone. They are able to use their oar-like appendages to move through the water and are mostly bottom-dwellers #2021MMM
Read 12 tweets
Heads up: Iceland has been monitoring #volcano unrest at #Reykjanes Peninsula. #Aviation color code orange due to quakes & indications of shallow magma dike. If an eruption occurs, ash hazard may affect North Atlantic air #travel.… #geology #weather Image
"Suspense in Iceland as dormant volcanic zone shows signs of life" by @physorg_com - volcanologists say a #Reykjanes eruption would likely be more lava than ash; not expecting repeat of 2010 Eyjafjallajokull #aviation #travel disruption… #volcano #geology
"Sleeping Giant: Earthquakes And Volcanoes In #Reykjanes" by @rvkgrapevine - volcanologists describe how the peninsula's eruption history shapes expectations of possible volcanic activity to mostly lava flows, not explosions/ash… #Iceland #volcano #geology
Read 45 tweets
JohnBrady @smithcollege, is a pedagogical master! He just has finished his free and amazing online #petrology #teaching tool! GREAT online #lecture material for #geographyteacher #geology #MetamorphicGeology and many more

@SchornSimon @GeodynamicsG @EGU_GD @UniGraz @ETH_ERDW
Check your "Jiscmail" inboxes! I think you might be interested in some of the online teaching tools John Brady provides!
@KeepItRheol @KeelePetrology @ign_petrology @petrochronics @PetroFactory @petrology @petrologyslides @petrologychonn
Read 3 tweets
🧵For #MosaicMonday (aka #MillefioriMonday!) it's got to be these: the pyramid mounts from @NT_SuttonHoo. Made of cloisonne goldwork, garnets & coloured glass, these were the first gold artefacts found during the 1939 excavation 1/…
📷@britishmuseum Image
As shown in #TheDig, they were found by Lily James's character #PeggyPiggott, who was born in Kent in 1912. She was an experienced archeologist when she arrived @NT_SuttonHoo, she had studied @Cambridge_Uni & @UCLarchaeology, directed her own dig & published several papers 2/ Image
Her career spanned 60 yrs & she is recognised for her field methods, research into prehistoric settlements, burial traditions & artefact studies (particularly glass beads). She reconsidered #FigsburyRing & a bequest from her helped us to acquire meadowland around Silbury Hill 3/ Image
Read 5 tweets
Believe it or not, the Batman is real. Well, it’s more like a man who was the Bat. This character was beloved by those who knew him. While the story of Robert Douglas Lancey starts in the woods of NH, #OTD in 1944 it takes a dark turn in the unlikeliest of places. A #WWII thread. Image
On July 20th, 1941, Robert donned a crazy costume at @camptakodah. He looked like a cartoon bat. His job was to surprise the campers and have them chase him. But, no one could catch Robert no matter how hard they tried. He was too fast, too good, and too clever to be caught. Image
Robert, a dedicated Boy Scout and respected summer camp leader, with a distinctive long face and a “pug nose,” would go on to win a great many personal challenges that he faced well beyond the sanctity of a place that truly is “friendly to all.” Image
Read 25 tweets
Today starts the 2nd #advent list to honor BIWOC this month. We’ll be learning a bit abt a different BIWOC’s work each day. Bookmark the thread. More of a mix of premodern, CRT & some STEM scholars this year.

#medievaltwitter #shakerace #adventcalender #citeblackwomen
Like last year, it'll be impossible to mention all the amazing WoC scholars. This is just a starter pack &you all should be finding, reading & citing these women et al. If I missed anyone, nothing personal. I’ll try &catch you next time. #citeblackwomen
Day1: Adrienne Merritt @BlackPhDE is a fierce medievalist & German Studies scholar. Her areas of expertise vary from Old English to late medieval mystical writings, decolonial theories, identity & inclusion of marginalized students/scholars within German Studies. 1/
Read 385 tweets
Daily Bookmarks to GAVNet 11/07/2020…
Scientists work to shed light on Standard Model of particle physics…

#light #particle #physics
How US Presidential Elections Are Impacted By Geology…

#geology #elections
Read 8 tweets
New paper explaining why and how carbonatites host REE mineralisation is now out in @ScienceAdvances and it's #openaccess!…

#rareearths #geology

One of the issues with REE in carbonatites is that although carbonatites are obviously high temperature igneous, the mineralisation itself always seems to be low temperature (400 °C and lower).
So most of the research so far was focused on what ligands mobilise REE at these low temperatures. People suggested fluoride, chloride, carbonate, and others. The aim was to understand what concentrates REE from an entire carbonatite body to a high grade localised deposit.
Read 22 tweets
Poetry host Larissa Reid @Ammonites_Stars has been fascinated with geology since she was a child. She spent six years volunteering with the Scottish Geodiversity Forum (now @scottishgeology) and founded and runs the biennial Hugh Miller Writing Competition. #TopTweetTuesday
Poetry by our host from Scotland, Larissa Reid @Ammonites_Stars #time #memory #landscape #nature #poetry #scottishpoetry #geology 💎

‘I slip from dream to real to back’
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I've never quite been the same since I learned about trovants. These are rocks, actual rocks, that not only 'grow' but MULTIPLY.
The most famous example can be found in the tiny village of Costeşti in Valcea County, Romania. Known locally as the 'living stones' they have been the backdrop to folktales for millennia.
Indeed they have been there much longer than people, coming into existence due to a series of earthquakes some 6 million years ago.
Read 10 tweets
Travelling through #India you can't miss such boulder heaps...

Think of Hampi's ruins (below) or Sravanabelagola (Karnataka), or Mt Abu (Rajasthan)?

#DidYouKnow, such isolated hill/ridge features that jut out from the surrounding plains are called #inselbergs?

#Geo thread/ Geology: inselberg formation at Hampi, Karnataka, India
Derived from German words meaning 'island mountain', #inselbergs are residual features that form across climatic zones.

Yet are most abundant in tropical regions with granite-gneiss outcrops, like those on the cratons across India, as also in the zones marked BCG, CGC, and SGT. Map in the publication, The Indian Peninsula: Geomorphic Lan
Debates rage on how #inselbergs formed, yet most concede they are the result of weathering (breaking down of rocks at site) and erosion (transport of weathered material).

In #India, insolation (heat from sun's rays), rainwater, and rivers have shaped landscapes for millennia. Hampi's boulder inselbergs with the river Tungabhadra snakin
Read 10 tweets
Morning everyone! I’m Katy and I’m going to tweet about #archaeology, #geology and #landscape. But mostly, about #sarsen stone in the county of Wiltshire, UK. Thank you to @lornarichardson and @James__Dixon for organising #PATC5 and for accepting this paper 0/16 The abstract for this Twitter paper: This paper takes one of my recent #DailySarsen tweets and tells a story of the sarsen stone depicted in that previously-tweeted photo. Much of my public archaeology happens out-of-doors. The frightening reality of a serious communicable disease that has no vaccine means it will be some time before I can once more welcome people into Sarsen Country. My small efforts to recover a sense of Sarsen Country digitally, with #DailySarsen, have been welcomed by friends old and new. So here is an elaboration of one of the tweets; I hope people will enjoy the tale.
During CV-19 lockdown and as long as distancing measures apply, my public archaeology landscape walks in #SarsenCountry are suspended. Groups trips for local/regional societies to visit places in Wiltshire (UK) where sarsen stones can be seen are off-limits #PATC5 #DailySarsen 1/ The title of my paper for the Public Archaeology Twitter Conference is ‘#DailySarsen, or, Walking hand-in-hand with human and non-human friends’. Katy Whitaker, University of Reading/Historic England @artefactual_KW
Sarsens are the large grey boulders making the familiar shapes of Stonehenge, and Avebury’s great circles. They’re in medieval church walls. They pave our streets and protect grass verges. Sites in southern England from Dorset to Norfolk make #SarsenCountry #PATC5 #DailySarsen 2/ A photograph of Stonehenge showing some of the tall upright grey sarsen stones capped by horizontal sarsen lintels. Two sarsens lie in the grass in the foreground.
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We love getting questions about #mining, #minerals and #geology! We were asked about historical #gold mining in #Brookfield, #QueensCounty. Check out this thread!

#nspoli #novascotia #nshistory #cbpoli #capebreton
@GordonWilsonLNS @BernJordanMP @RegionofQueens @LHNOWnews ImageImage
While there were several mines in the #Brookfield #Gold District, almost all the gold produced came from the Brookfield mine operated by Wilbur L. Libbey, which was discovered in 1885.
#nspoli #novascotia #nshistory #cbpoli #capebreton Image
In July 1886, it was acquired by John McGuire and some American associates known as the #Brookfield Milling Company. Under McGuire's management a considerable amount of ore was mined and hauled to #PleasantRiver, #Lunenburg County, for milling.
#nspoli #novascotia #nshistory Image
Read 24 tweets
We love getting questions about #mining, #minerals and #geology! We were asked about mining in Gays River:

#nspoli #cbpoli #novascotia #capebreton #nshistory @SeanFraserMP @LarryHarrisonPC #gold ImageImage
#Gold was discovered in Gays River, Colchester County, by George Gay and Berry Corbett on their adjoining farms in June 1862. Unfortunately, the pair initially charged exorbitant prices for accessing their properties which delayed prospecting and mining.
#nspoli #novascotia Image
In 1866, a small crusher was built but was not kept very busy. In 1869, a handful of tunnels and shafts were dug.
#nspoli #novascotia #nshistory Image
Read 23 tweets
Closed due to Covid AND road repair. Kasha-Katuwe is located on the Pajarito Plateau, at an elevation of 5700-6400 feet above sea level. Like most of the region, the volcanic activity that formed the Jemez Mountains sculpted the peculiar landscape. #geology #NewMexico #volcanic
The Jemez volcanic field has been active for the past 15 million years. It formed at the intersection of the Rio Grande rift and the Jemez lineament, an ancient northeast-trending fault line that has been a locus of volcanism for the last 10 million years.

The Valles Caldera is the 3rd largest super volcano in the U.S. It sits on top of an older caldera, the Toledo caldera, which may be on top of an older caldera. The calderas were formed during voluminous eruptions in the Jemez volcanic field 1.61 - 1.25 million years ago.
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Paris’ #NotreDame Cathedral caught fire one year ago today. Read this thread to learn why the stone used to build it came from #Paris' catacombs.
#nspoli #cbpoli #novascotia #capebreton #geology ImageImageImage
The limestone used to build Notre Dame formed 45 million years ago when Northern France was covered by a tropical sea. Limestone forms when bones/shells of sea creatures pile up and are compressed into rock.
#nspoli #cbpoli #novascotia #capebreton #geology #notredame Image
Limestone often has fossils in it as a result, like the clam in the picture below from #NotreDame.
Surface quarrying of limestone in the #Paris area started in the first century. Underground quarrying started in the 1300s and continued for centuries.
#nspoli #cbpoli #novascotia Image
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As people are tucking into Easter eggs today, here's a list of some of the *absolute worst* substitutes for chocolate eggs that #geology can offer you. Consider yourself warned.


Type: onion-skinned weathering of massive rocks (including sandstones and granites).

How: formed by weathering along spheroidal fracture planes within the rock mass

Why is bad: it's rock, so will break your teeth, and doesn't at all taste like chocolate

Type: concretions within sedimentary rock (often sandstones)

How: formed by precipitation of minerals around a central mass within sedimentary rock or soil

Why is bad: it's also rock, so will break your teeth, and doesn't at all taste like chocolate either

Read 7 tweets
Why does the granite at #PeggysCove have so many cracks?!
Check out this thread for the answer.

#nspoli #cbpoli #novascotia #capebreton @BernJordanMP @MattWhitman2020 @HughMacKayCSM @TourismNS @NS_Museum #nshistory #geology Image
The rocks at #PeggysCove began 470 million years ago as mud and sand in a deep ocean basin near ancient Africa. They built up and were eventually compacted into shale and sandstone.
#nspoli #cbpoli #novascotia #capebreton #nshistory #geology Image
As tectonic plate movement caused North Africa and North America to collide 400 million years ago, the shale and sandstone were squeezed between the two continents and heat and pressure transformed them into slate and quartzite.
#nspoli #cbpoli #novascotia #capebreton #nshistory Image
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Vamos con un hilo sobre imágenes de satélite de deltas (y alguna foto de la ISS)


Son imágenes espectaculares, ¿No os parece?

#InGeoSatelliteView #geología #geology #deltas #vistasatelite

Delta del río Mississippi 🇺🇸

Aporte de sedimentos… Image
Se estima que la costa ha avanzado , en el Sur de
Luisiana, hasta unos 80kms en los últimos
5.000 años.…… ImageImage
El mayor delta de Europa.

El río Volga en el Mar Caspio 🇷🇺… Image
Read 13 tweets
We love getting questions about #mining, #minerals and #geology! We were asked about #gemstones in #NovaScotia. Here’s our answer:

#nspoli #cbpoli #capebreton Image
Gemstones that are usually considered “precious stones” are diamonds, rubies, sapphires and emeralds. All other gemstones are considered “semi-precious” (i.e. agate, amber, amethyst, jade, pearl, etc.)
#nspoli #cbpoli #capebreton #NovaScotia Image
These definitions date from the 1800s and they are subjective, not scientific. There is not universal agreement with them, but we mention them to point out that there is usually a distinction made between precious and semi-precious stones.
#nspoli #cbpoli #capebreton #NovaScotia Image
Read 19 tweets
Re-watching some shows while #socialdistancing for #MarchBreak? We're chatting this week about some of our favourites that have great #geology or interesting stories behind their #filminglocations.
#nspoli #cbpoli #NovaScotia #CapeBreton #COVIDCanada #covid19 #COVID19NS ImageImageImageImage
#GameofThrones used #Iceland's #Thingvellir Park as the #BloodyGate. Its landscape is caused by the Eurasian and #NorthAmerican tectonic plates meeting there and pulling apart at a rate of 2 cms per year. This made a rift valley: low land between 2 separating continents.
#nspoli ImageImageImageImage
#MagheramorneQuarry, #NorthernIreland, is the set for #CastleBlack and #TheWall in #GameofThrones. The quarry wall is used as a backdrop and effects make it look huge.
The site's limestone was used to make cement. #NS has a limestone quarry and cement plant in Brookfield.
#nspoli ImageImage
Read 14 tweets

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