Mastodawn

Neogene Uplift Of The Chiribiquete Tabletop Mountains In The Colombian Amazon And Its Paleobiogeographic Implications
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https://doi.org/10.1016/j.palaeo.2026.113645 <-- shared paper
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H/T Richard F. Ott
“The Chiribiquete are table top mountains located deep in the Colombian Amazon and host many rare endemic species. Helanlin Xiang's work shows that the Chiribiquete Mountains likely upifted before the Early Miocene and could have acted as a long-lived stepping stone, connecting species in the Andes with the Guyana Shield…”
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#Miocene #Paleogeography #Palynology #Amazonia #Caquetá #paleobiogeography #Columbia #Amazon #jungle #geomorphology #neogene #uplift #geology #structuralgeology #tectonics #Chiribiquete #tabletopmountains #Andes #GuyanaShield #dating #isotopes #biome #ecosystem #tepui #elevation #sedimentology #stratigraphy #Araracuara #fluvial #lacustrine #deposition orogeny #regional #uplift #drainage #hydrography #hydrology #river #network #GIS #spatial #mapping #spatialanalysis #spatiotemporal #geophysics #seismology

💧🌏 Greg Cocks Feb 11

Late Quaternary Variations in the Level of Paleo-Lake Malheur, Eastern Oregon
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https://doi.org/10.1006/qres.1998.2005 <-- shared paper
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https://www.oregonencyclopedia.org/articles/pleistocene-pluvial-lakes/ <-- shared technical article, “Pleistocene Pluvial Lakes” [OR]
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https://en.wikipedia.org/wiki/Malheur_Lake <-- shared Wikipedia page
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#EasternOregon #water #hydrology #geology #surfacewater #paleolake #LakeMalheur #Oregon #SouthernOregon #USA #endorheicbasin #endorheic #quaternary #fluvial #pluvial #fluvial #lacustrine ##Quaternary #Pleistocene #Holocene #PaleoLake #sediment #sedimentary #beaches #gravel #geology #sedimentology #tephra #volcanism #spatialanalysis #spatiotemporal #geologichistory #spatial #mapping #sampling #stratigraphy #dating #radiocarbon #chronology

💧🌏 Greg Cocks Feb 10

Stratigraphic Evidence For Modern-Like Glacier Extents In South-Central Alaska Within The Last Glacial Period (MIS 3)
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https://doi.org/10.1111/bor.70043 <-- shared paper
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https://www.nps.gov/articles/000/ancient-glacier-change.htm <-- shared @NPS technical article
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#glacier #Wisconsinan #glaciations #alaska #iceage #sediments #moraines #geology #stratigraphy #model #cryosphere #ice #snow #sedimentary #Chitina #CopperRiver #proglacial #water #hydrology #fluvial #glaciofluvial #glaciolacustrine #fans #Holocene #geomorphology #geomorphometry #landform #hydrogeomorphology #sedimentology #stratigraphic #sampling
@NPS

Dr. Or M. Bialik Jan 25

My SedsOnline talk is now available on YouTube, if you feel like hearing what I have to say about the fundamental concepts of facies in carbonate #sedimentology, and how we need to rethink them.

https://www.youtube.com/watch?v=OcaNANyERXI

Rethinking the meaning of carbonate facies

YouTube

💧🌏 Greg Cocks Jan 21

Subsidence [California Groundwater-Extraction-Caused]
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https://youtu.be/wYZx6tOP4qs?si=aq4yKNKE8aKRofEP <-- shared CaDWR video - ‘What is subsidence?’
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https://youtu.be/8ERftzZL0OE?si=IKa82AMTcweZHp0L <-- shared CaDWR video - ‘The Role of Critical Head in Managing Land Subsidence’
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https://water.ca.gov/Programs/Groundwater-Management/Subsidence <-- shared technical overview
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https://phys.org/news/2024-11-groundwater-rapid-california.html <-- shared technical article
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https://doi.org/10.1038/s43247-024-01778-w <-- shared paper
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https://mavensnotebook.com/2025/09/08/ca-water-commission-californias-land-subsidence-challenge-a-look-at-dwrs-draft-bmp/ <-- shared technical article
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#California #USA #infrastructure #subsidence #water #hydrology #California #geology #sedimentology #engineeringgeology #cost #risk #hazard #damage #economics #groundwater #pumping #overpumping #extraction #humanimpacts #elevation #waterresources #riskassessment

💧🌏 Greg Cocks Jan 20

Conceptualizing River Floodplains
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https://doi.org/10.1029/2024EF005681 <-- shared paper/commentary
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"PLAIN LANGUAGE SUMMARY: River floodplains are integrative ecosystems in which diverse processes operate together to maintain river health. Floodplains are as critical to river health as the channel itself, yet floodplains lack the legal protections afforded to river channels in many countries.
KEY POINTS
• A river floodplain is an integrative physical, chemical, biological system and a key component of a river corridor
• Contemporary societal perceptions and regulatory frameworks do not reflect this scientific consensus...”
#water #hydrology #river #floodplain #surfacewater #geology #sedimentology #geomorphology #ecology #biogeochemical #policy #planning #interdisciplinary #model #modeling #management #monitoring #ecosystem #riverhealth #legal #regulations #humanimpacts #overview

Planetary Ecologist Jan 18

Laterite (Pedology 🟤)

Laterite is a soil type rich in iron and aluminum that often forms in hot, wet areas; most such soil is found in the tropics. Nearly all laterites are of rusty-red coloration due to high iron oxide content. Laterite soils develop by intensive and prolonged weathering of the underlying parent rock, usually under conditions of high temperatures and heavy rainfall...

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

#Laterite #Pedology #Regolith #Weathering #OreDeposits #Sedimentology

Laterite - Wikipedia

Planetary Ecologist Jan 15

Lens (geology) (Petrology 💎)

In geology, a lens or lentil is a body of ore or rock that is thick in the middle and thin at the edges, resembling a convex lens in cross-section. To thin out in all directions is to "lens out", also known as "lensing". The adjectives "lenticular" and "lentiform" are used to describe lens-like formations. Lenticle is a synonym for lentil, but may also refer to a fragment of rock that...

https://en.wikipedia.org/wiki/Lens_(geology)

#Lens #Petrology #Sedimentology