Ancient Lakes And Rivers Unearthed In Arabia's Vast Desert
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https://phys.org/news/2025-04-ancient-lakes-rivers-unearthed-arabia.html <-- shared technical article
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https://doi.org/10.1038/s43247-025-02224-1 <-- shared paper
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#GIS #spatial #mapping #water #hydrology #quaternary #desert #geomorphology #landforms #geomorphometry #Arabia #climatechange #RubalKhali #SaudiArabia #holocene #model #modeling #spatialanalysis #spatiotemporal #earthsystemmodel #geology #lacustrine #fluvial #sediments #sedimentary #flood #flooding #lakes #AfricanMonsoon #rivers #paleohydrology #stratigraphy #remotesensing #landsat #earthobservation #dating #delta #cliff #terrace #rainfall #precipitation

Hairy Neil @rovingrollo.bsky.social reminded me that it's #RockinTuesday Here's a lovely rock from the creek bed of Gunlom waterfall creek, a water-carved history of geological time past, frozen waves. #photography #geology #kakadu #rocks #patterns #sedimentary #EastCoastKin #PhotographersUnited

Microbialites ( #sedimentary buildups formed by microbial activity) were very common in the Proterozoic, but other groups took over in the Phanerozoic. But when the #environment is stressed, they come back - and we can use them to infer on past #ecological stress gradients, but also the conditions at the stressed end member.
https://www.sciencedirect.com/science/article/pii/S0031018215005404
I rather like this paper, and to me, it's one of my most underperforming as far as citations are an index. So let me highlight it once more.

We have a new pape! We explore the complex interactions between #climate, water chemistry, and post-depositional #sedimentary processes... and how they can produce some wierd #minerals.
https://www.lyellcollection.org/doi/full/10.1144/jgs2024-146

Some ##UrbanGeology today in #Middelburg with colleague from Roosevelt Academy. Nice #rocks #fossils #crystals #sedimentary structures. #Geology in the Netherlands!

#Sandstone is a clastic #sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks.[1]

Open (funded) #PhDposition at the University of Vienna (with Theresa Nohl, the most caring person you'll ever meet) about how time is preserved in the #sedimentary record.
https://www.egu.eu/jobs/6596/open-phd-position-in-the-fwf-funded-project-update-for-understanding-geological-time/

The SedsOnline student seminar tomorrow is worth attending. The theme is #Sedimentary Systems in the #energytransition, and it highlights new voices in this space.
https://sedsonline.com/webinar-registration/

Now live - #MinCup24 Round 1 Match 1: Kaolinite vs. Abelsonite. Not much of a fight if you ask me (#sedimentary bias).

https://www.mineralcup.org/2024/vote/r1m01

When we went on #hedgewatch in the #Heide/#Heath. We found again #windkanter/#ventifacts. This was a #sandstone a #sedimentary #rock & is now a #quartzite i.e. the #metamorphic equivalent. Thus it has seen high #temperature &/or #pressure. The stripes are the remnants of the sedimentary layers

#CatForScale

#geologywithcats #geology #CatsOfMastodon

#sedimentary #geology #chemistry
how do i detemine what makes these colors? i have a big chemistry set in storage.

p.s. apparently the kid don't approve. actually... he was having a good time scrabling up the broken shale to reach this.

it is shale outcrop, Rensselaer Co. NY. as far as i can tell it is called Giddings Brook slice in the Taconic allochthon.

This #VolcanoThursday something special😻 On the picture a #rock called #restingolite after #LaRestinga on #ElHierro. These rocks were floating on the #ocean after a #eruption but are not volcanic. Its a frothed up #sedimentary rock. The H2O in the rock was evaporated by #magma

#geology #geologywitgcats #volcano #catsofmastodon

The 2nd stop of today's #hedgewatch/#hike was at the Saline de Fuencaliente. It's great to watch the making of #salt. Did you know: all the salt we use formed from evaporating sea water? That is why salt is an #evaporite i.e. a mineral that forms #sedimentary #rocks
#Geology #geologywithcats

#WeekendReading: Halevy et al., about the impact of inorganic reactions and transport in depositional environments on the isotopic composition of pyrite. TLDR - look also at the #sedimentary context, not just the #geochemistry.

https://www.science.org/doi/10.1126/science.adh1215

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.