Lmst

Desert pavement (Deserts 🏜️)

A desert pavement, also called reg, serir, gibber, or saï is a desert surface covered with closely packed, interlocking angular or rounded rock fragments of pebble and cobble size. They typically top alluvial fans. Desert varnish collects on the exposed surface rocks over time. Geologists debate the mechanics of pavement formation and their age.

https://en.wikipedia.org/wiki/Desert_pavement

#DesertPavement #Deserts #Sediments #AeolianLandforms

Groundwater Dominates Snowmelt Runoff And Controls Streamflow Efficiency In The Western United States
--
https://doi.org/10.1038/s43247-025-02303-3 <-- shared paper
--
#GIS #spatial #mapping #water #hydrology #fedscience #climatechange #snowmelt #waterresources #watersupply #management #planning #watersecurity #USWest #Rockies #snow #winter #mountain #catchment #dating #tritium #spatialanalysis #spatiotemporal #runoff #streamflow #infiltration #model #modeling #geology #geomorphology #groundwater #storage #surfacewater #streamwater #precipitation #bedrock #soils #sediments #permability #porosity #watershed #subsurfaceflow #storage #climate #future #landscape

14-May-2025
#Alaska: Ancient cave sediments provide new #climate clues
Discovery of 20,000-year-old cave #sediments on Prince of Wales Island offers rare land-based evidence of ancient #meltwater events

https://www.eurekalert.org/news-releases/1083622
#science #paleoClimate #glaciers

Hwangto (Glaciology 🗻)

Hwangto, a Korean loess soil, is a yellow-coloured soil, which contains high levels of potassium chloride and calcium. Hwangto is sometimes called a 'living soil' for its medical effects. Korean loess called “Hwangto”or “the red yellow soil or earth” has been a basic element or nourishment which has cultivated Korean nature and cultural heritages. Hwangto re...

https://en.wikipedia.org/wiki/Hwangto

#Hwangto #Pedology #Sediments #Glaciology #TypesOfSoil #AeolianLandforms

Ancient Lakes And Rivers Unearthed In Arabia's Vast Desert
--
https://phys.org/news/2025-04-ancient-lakes-rivers-unearthed-arabia.html <-- shared technical article
--
https://doi.org/10.1038/s43247-025-02224-1 <-- shared paper
--
#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

La #grotte de #Tinshemet se situe à mi-chemin entre #Jérusalem et #Tel-Aviv, à la jonction des hauts plateaux de #Judée et de la plaine côtière méditerranéenne. Elle a été découverte dans les années 40, mais ne fait l’objet d’une #fouille approfondie que depuis 2017.
Fouille difficile : les #sédiments sont cimentés, comme du #béton. Mais cela vaut le coup.
Les premiers résultats que viennent de publier les #archéologues démontrent que la grotte a bien été occupée par des #humains, il y a 100 000 ans.
Ils ont découvert des traces de cendres de #bois, des dizaines de #silex savamment taillés, des milliers de #fragments d’#ocre de tailles, formes, textures et #couleurs variées, des restes d’#aurochs, d’équidés, de gazelles, de sangliers - même une phalange de rhinocéros…
Et, surtout, les #squelettes de 5 humains, dont deux quasi-complets, en position fœtale, signe qu’ils ont été enterrés lors d’une #sépulture.
C’est déjà très émouvant.
Avec quatre autres sépultures de la #région datant de la même époque, dont une qui se trouve à seulement dix kilomètres de là, voilà le plus vieux #cimetière humain jamais découvert.

#Israel #archeologie
https://www.radiofrance.fr/franceinter/podcasts/la-terre-au-carre/la-terre-au-carre-l-actu-du-mardi-25-mars-2025-6988075

USGS Releases Assessment Of Undiscovered Oil & Gas Resources In Wyoming, Southern Montana
--
https://www.usgs.gov/news/national-news-release/usgs-releases-assessment-undiscovered-oil-and-gas-resources-wyoming <-- shared article
--
https://doi.org/10.3133/fs20243049 <-- shared publication
--
https://www.sciencebase.gov/catalog/item/65032556d34ed30c2058be2d <-- shared open data
--
https://api.sciencebase.gov/geoserver/ows?service=wms&version=1.3.0&request=GetCapabilities&namespace=sb-65032556d34ed30c2058be2d <-- shared spatial service
--
#GIS #spatial #mapping #oilandgas #OG #naturalresources #oil #gas #fedscience #model #modeling #Wyoming #Montana #assessment #WindRiverBasin #BighornBasin #PowderRiverBasin #exploration #undiscovered #energy #energysupply #geology #structuralgeology #sediments #lithology #reserves
@USGS

OnlineFirst - "Slippery substances: Accreting alternative chemical knowledges in a heavy industry port" by @ameliahine

@awi
#chemicalstudies #sediments #seabed #chemical #port #decarbonisation #hifmb

https://journals.sagepub.com/doi/full/10.1177/25148486251323455

Pétrole : les preuves de son origine biologique
Par François Baudin, Encyclopédie de l’environnement
https://www.encyclopedie-environnement.org/vivant/preuves-origine-biologique-petrole/
#science #nature #vie #pétrole #sédiments #végétation #biologie #écologie #environnement #encyclopédie #géologie #géographie

New #DNA research examines predecessors of Red Lady of El Mirón.

#archeogenomics #sedaDNA #sediments #Pleistocene

https://phys.org/news/2025-02-dna-predecessors-red-lady-el.html

New Study Tracks The 100,000-Year Journey Of Underground Water
--
https://scitechdaily.com/new-study-tracks-the-100000-year-journey-of-underground-water/ <-- shared technical article
--
https://doi.org/10.1038/s44221-024-00366-8 <-- shared paper
--
[there is an old saw along the (flow)lines of "Surface water is just the expression of groundwater on the land"]
#GIS #spatial #mapping #water #hydrology #subsurface #groundwater #watercycle #waterresources #streamflow #surfacewater #connection #model #modeling #CONUS #USA #baseflow #sediments #aquifers #alluvium #flow #waterresources #subbasins #watershed #climatechange #contamination #rainfall #precipitation #snowmelt #continental

schematic - Here [they] quantify the extent of groundwater–stream connections over the continental United States

maps and charts - Simulated groundwater ages compare favourably to those reported in literature and expand understanding by providing a more complete age distribution of all aquifers

photo - an aerial view of the Taylor Park watershed in Gunnison County, Colorado

maps - Lateral and vertical extents of groundwater flow in the continental United States

Earlier this year, the IUGS rejected the Anthropocene Epoch as a formal unit of the Geologic Time Scale.
https://www.iugs.org/_files/ugd/f1fc07_23c6f9e723bc47b9b5fdcd300f806f25.pdf
#anthropocene #paleo #sediments

Siltation (Earth sciences 🌍)

Siltation is water pollution caused by particulate terrestrial clastic material, with a particle size dominated by silt or clay. It refers both to the increased concentration of suspended sediments and to the increased accumulation of fine sediments on bottoms where they are undesirable. Siltation is most often caused by soil erosion or sediment spill. It is sometimes r...

https://en.wikipedia.org/wiki/Siltation

#Siltation #Sediments #EarthSciences #WaterPollution

'The Nastiest Soils On Earth' Are Getting Recognized As A Bigger Problem
--
https://phys.org/news/2024-11-nastiest-soils-earth-bigger-problem.html <-- shared technical article
--
https://lnu.diva-portal.org/smash/record.jsf?pid=diva2%3A1895656&dswid=-9242 <-- link to doctoral thesis
--
#acidsulfatesoils #acidrockdrainage #microbialecology #acidophiles #oxidation #sediments #genesequences #acidsulfate #soils #humanimpacts #risk #hazard #waterquality #ecosystem #health #geochemistry #microbiology #mitigation #sulfide #coast #coastal #water #hydrology #pH #acids #metals #rainfall #snowmelt #dissolution #precipitation #waterbodies #plants #fish #fisheries #heavymetals #aluminum #fishkill #mortality #oxidation #bioremediation

#Diatoms remove #CO₂ from the air for use in photosynthesis.

When they die, diatoms sink, taking with them #carbon from surface waters and locking it in deep ocean #sediments.

#Diatoms remove #CO₂ from the air for use in photosynthesis.

When they die, diatoms sink, taking with them #carbon from surface waters and locking it in deep ocean #sediments.

My first first-authored #scientific #publication as a former #postdoc at ICTA-UAB, published in #Journal of #Chromatography A one year and a half ago, deserves a #thread on #Mastodon as well!
We selectively extract #levoglucosan and its isomers from complex matrices, such as #sediments, for quantification by liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS)!
#Science #ScienceMastodon #Paper
#LiquidChromatography #MassSpectrometry
https://doi.org/10.1016/j.chroma.2023.463935 (1/28)