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

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)

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

Contexte géomorphologique du site archéologique de Chuchuwayha (Colombie Britannique, Canada). Apports de l’analyse sédimentologique
L’objectif est ici d’identifier les signatures sédimentaires des différentes formations superficielles environnant le site […] et de les discuter par rapport aux grandes phases climatiques et aux périodes de fréquentation humaine.
https://journals.openedition.org/geomorphologie/17496

Researchers found weak layers of #sediments beneath the #seafloor which crumbled as #oceans warmed and #ice sheets declined causing of giant #underwater #landslides in #Antarctica which they believe could have generated #tsunami waves that stretched across the Southern Ocean.
#EarthScience #sflorg
https://www.sflorg.com/2023/05/es05182301.html

Not #Today but an every day phenomenon...the wastes we produce end up in places we do not expect.

A recent-ish outing to help kids understand the connection between the natural environment and the materials we use and dispose.

The #shoreline of the Columbia #River provide a useful exposure to wastes tossed locally and wastes that have travelled and been deposited.

Primary wastes found include cigarette butts and broken glass/bottle caps...of local origin, along with #microplastics, #plastic and #Styrofoam that have likely been transported before #deposition in #shoreline #sediments.

#AnthropoScenes #Anthropocene
#Polution
#Environment
#Ecology
#Waste

#SedentarySunday #CoastalErosion #Geology #SeaLevelRise #Sediments #Sand #Beach #Oregon #Erosion

Aeolian sands from a glacial age
Form terraces suitable for abodes
Rising seas diminish their defenses
Not rip-rap, not beach grass, not sand fences
Who will be the last, when the cliff erodes