It is hard to overstate how critical @ncar-ucar.bsky.social is to climate science in the US and around the world. It's the beating heart of our field. Generations of scientists have trained there, and almost everyone I know relies on deep collaborations with NCAR scientists. It's end is unthinkable.

🏆Win🏆the perfect Christmas 🎄 gift for a stones enthusiast: STONE LANDS (on the Waterstones and Telegraph Best Books of 2025 lists) AND ALSO THE OLD STONES (The Megalithic Portal guide, winner of Current Archaeology Book of the Year) To win a signed (and dedicated if you like) copy of both books… 1/

Geology people who do we you know in Edinburgh so that we can connect and go to Siccar point together. Do your thing social media!!!

When viewed from this, (opposite), side the large #FridayFold resembles a rock formation seen in the #MonsterHunterWilds computer game. ⚒️🧪

Not usually an admirer of lichen as they obscure the geology, but these eye catching colonies bear testament to the fine air quality here in the Outer Hebrides. 🧪⚒️

Live from the field, #FridayFolds on Berneray, Outer Hebrides. Sheared Lewian gneiss. Waiting for tide to go out 😎

I’m working hard to find glimmers (micromoments of joy, peace, and happiness) and I wanted to share one of today’s glimmers. Here is a river otter sunning himself on the banks of the American River.

A beautiful example of an Outer Hebrides dyke cutting the foliation in Archaean #Lewisian gneiss. Although folded by later Laxfordian deformation both the dyke and a thin apophysis exhibit near perpendicular angular discordance in the fold hinge, becoming concordant in the limbs. Isle of Harris. ⚒️🧪

A #FridayFold fresh from today's first field excursion of the new year. The black Outer Hebrides Basic dyke was intruded into the paler grey Archean Lewisian gneiss prior to Laxfordian deformation which produced the tight recumbent fold. Near Rèinigeadal, (Rhenigidale), N. Harris, Outer Hebrides.

Interesting barometer reading this morning as storm Éowyn passes by😵. Adjusting for elevation of 67m this is equivalent to approx. 948hPa at sea level. I think I might set it to show sea level equivalent in the future.

My OH is a keen walker and getting quite good at photographing interesting geological locations. This has gone to the top of my Spring excursion list. Pink #Laxfordian granitic intrusions invading #Lewisian gneisses and amphibolites. Mangersta, #IsleofLewis ⚒️🧪

Walks on Boxing Day have become a lot more interesting since moving to the #IsleofLewis

Friends, Consider joining the Montana Geology Facebook group! Started in the spring of 2020, we now boast about 20K enthusiasts! We only hope to spark interest in Montana Geology! We shall continue down this path in the new year. All the best…Rob Thomas www.facebook.com/share/g/15TP...

The Stillwater Complex, a 2.7 billion year old ultramafic-mafic layered intrusion in Montana. Check it out. www.facebook.com/share/p/15V1...

Spot the refolded isoclinal #FridayFold. Traigh Shanndaigh near Eòrapaidh (Eoropie), #IsleofLewis ⚒️🧪 #Lewisian #Geology

Traigh Iar, Udal, North Uist, Outer Hebrides

Makes a great display area😍 My local library is really gneiss

I’m so incredibly keen to learn the Irish language in person this summer 😊 Does anyone have any recommendations for courses over in Ireland? 🇮🇪 #irish #gaeltach #gaeilge #gaelic

There are many larger folds in the #Lewisian gneisses around Cunndal Bay, #IsleofLewis, but these #FridayFolds are the best exposed, (cleanest) I've seen, so far. ⚒️🧪 #Geology

✨#JWST ornament giveaway! 🤩 My first Bluesky exclusive giveaway! Up for grabs are 5 of my best-selling holiday ornaments! 💫 How to participate: 1) follow me 2) enter here sciencesocks.co/pages/giveaway 3) like/repost 🚨 P.S.: please consider sciencesocks.co for your holiday shopping :) 🔭🐡🧪#bsnm

The sea cliffs on the west side of the #IsleofLewis provide some spectacular cross sections through #Lewisian gneisses. I guess I'm putting a drone at the top of my Xmas list. ⚒️🧪 #Geology

At the other end of the strain spectrum it becomes really difficult to identify these banded rocks as originally being pillow lavas😉 ⚒️🧪 #Geology

Yesterday's post showed flattened pillow lavas crumpled by late stage minor folds. @callanbentley.bsky.social asked if there are less deformed rocks nearby which show they are indeed pillow lavas. Indeed there are😍 ⚒️🧪 #Geology

This was the first geological photo I posted on Twitter back in January 2021. #FridayFold Small scale folding of flattened pillow lavas, (scale approx. 8cm long). Svecofennian greenstone belt, Kumlinge, Åland Islands, Finland. ⚒️🧪 #Geology

The volcanic features on the Fife coast include this fine example of a basalt dyke intruded into volcanic tuff. The en-echelon disposition is picked out by the lichen which favours the basalt dyke. ⚒️🧪

Occasionally I (re)visit rocks that are not Pre-Cambrian. As a student in Dundee I was often taken on field trips to the Fife coast to see the wide range of sedimentary and volcanic rocks. These Carboniferous cross bedded sandstones are found near St Monans, south of St Andrews. ⚒️🧪 #Geolgy

Thoroughly enjoyed reading this engaging and thought provoking book.

A bonus #FridayFault from the west coast of the #IsleofLewis The sharp eyed amongst you may have spotted this little fault pair in the vertical limb of the #FridayFold I posted earlier. ⚒️🧪

A #FridayFold from the west coast of the #IsleofLewis. The dark mafic #OuterHebrides dykes were intruded into the #Lewisian gneiss. The original cross cutting relationship has been brought into near concordance during subsequent #Laxfordian deformation which also generated these folds. ⚒️🧪

@calamitaman.bsky.social Hope these #Lewisian gneisses seen on Berneray in the #OuterHebrides are what you are hoping to see🤔. They had certainly experienced a long and complicated tectonic history before being intruded by the late #Laxfordian pegmatite. ⚒️🧪

@barraisland.bsky.social have just joined Bluesky. Home of the best exposures of #pseudotachylite in the UK, around Greian Head and Seal Bay.⚒️🧪 The beaches aren't bad as well😎

#FridayFold in #Archaean amphibolites seen on the west coast of the #IsleofLewis. ⚒️🧪

Tiger stipe camouflage isn't really effective on the west coast of the #IsleofLewis👀 Compositional (rhythmic?) banding is preserved locally within an occurrence of #Lewisian "Older Basic Suite" meta-basics/ultrabasics. #Archaean ⚒️🧪

Looks like another fine Hebridean morning🌄. Looking east across Broad Bay to Point. A week ago we were exploring the NW Highlands Geopark around the mainland mountains silhouetted on the horizon😍 #IsleofLewis #Suiliven #Canisp #Assynt ⚒️🧪

#FieldtripFriday revisited. In 1975 I visited this unconformity on the north side of Loch Assynt where #Torridonian sandstones and conglomerates overlie #Lewisian gneiss. I even spotted the ledge I climbed onto to point out the unconformity surface to my classmates. #Geology ⚒️🧪

Attenuation of the limbs in these folds has left some of the fold hinges essentially floating. #Laxfordian folding on the north west coast of the #IsleofLewis #TectonicTuesday #Geology #Lewisian #Folding ⚒️🧪

🤦‍♂️ Always forget to include these for greater visibility ⚒️🧪

#FridayFold seen in a new road cutting near Stornoway. #Archaean Lewisian gneiss is cut by mafic #OuterHebrides dyke. Both are then folded during the #Laxfordian. Cross cutting of the gneissic foliation can be seen in the core of the fold, whilst the limbs are concordant.

A pair of shear zones cutting across the complicated fabric in garnetiferous metasediments belonging to the Harris Granulite Belt. I keep spotting new things on the larger outcrop photo 🤔but luckily it is only a 90 minutes drive to go back #ShearZones #Granulites #OuterHebrides

Brought back some #IgneousGin A suitable souvenir to remind me of our stay in the middle of #Ardnamurchan Paleocene intrusion centre #3. Our cabin was next to the distillery and was surrounded by ring intrusions giving the appearance of a caldera.

Tight to isoclinal #FridayFold in an Archaean layered intrusion at Cnoca Breac, on the west coast of South Uist. Considered to be some of the oldest rocks in the Outer Hebrides at > 2900 Ma the compositional layering is still distinguishable despite strong Laxfordian reworking

Last month I revisited the second best #pseudotachylite location in the Outer Hebrides, on the west coast of South Uist. I tried to pay more attention to the actual faulting this time🤓, but the breccias are always more photogenic😍 ⚒️🧪

#FridayFold in mylonitic Lewisian gneiss. ⚒️🧪 North-west coast of the #IsleofLewis

First field day of the year and found a gneiss spot for lunch. The north west coast of the Isle of Lewis never disappoints.

Another crisp Hebridean dawn. The mountain tops in the distance are approx. 60-80km away and include Canisp and Suilven (towards the left hand side).

#TuesayTufa, on the Isle of Barra in the Outer Hebrides, frequently obscures the Lewisian gneiss I came to see🙄 Despite this I have a soft spot for precipitated carbonate rock types, thanks to Dr Colin Braithwaite's enthusiasm as he explained a tufa deposit, found on a mapping course, in 1975.

This #MeltyMonday here is a #pseudotachylite vein with brecciated "xenoliths", cutting across the foliation in Lewisian gneiss. The vein extends for about 3m before disappearing under the beautiful white sands of Seal Bay on the W. coast of Barra, in the Outer Hebrides, Scotland. #Geology ⚒️🧪

Slickensides in the Dalradian metasediments at Macduff in NE Scotland. #FridayFault #Geology ⚒️🧪

Doubling up today with a #FridayFold and #FridayFault at Broadhaven in Pembrokeshire, SW Wales. #Geology ⚒️🧪