Mastodawn

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

ForestOrca Jan 16

#layers of #sedimentary #rock

ForestOrca Jan 16

#layers of #sedimentary #rock

ForestOrca Jan 16

#layers of #sedimentary #rock

ForestOrca Jan 16

#layers of #sedimentary #rock #geology

💧🌏 Greg Cocks Nov 25

Low Sinuosity Meandering Rivers Before Vascular Plants - Cambrian Tapeats Formation, Arizona, USA
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https://doi.org/10.1130/B38336.1 <-- shared paper
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#water #hydrology #Arizona #bars #braided #streams #Cambrian #channels #clastic #conglomerate #floodplains #fluvial #hydromorphology #sedimentation #landscape #LowerCambrian #meander #mechanism #migration #mudstone #Paleozoic #Plantae #pointbar #rivers #sandstone #sedimentary #Silurian #sinuosity #UnitedStates #USA #TapeatsFormation
@GSA

Paul Houle Nov 4, 2025

Crack in the layered rock at Treman State Park

#photo #photography #blackandwhite #monochromemonday #monochrome #rocks #ithaca #upstateny #sedimentary #gorge #treman

Show thread

Jason Oct 1, 2025

Finished igenous and moved on to #sedimentary rocks

https://viewer.gigamacro.com/view/aZ4yzKR6FvD8RpFb

https://uwaterloo.ca/earth-sciences-museum/peter-russell-rock-garden/7-keweenawan-conglomerate

Attendance 71/109 and 65/109 and 63/109 #GL101

Conglomerate as countertop, on display in Berryville, Virginia

Explore this 849 megapixel image.A polished slab of conglomerate intended for use as someone's countertop. Look for clast lithologies, rounding, and evidence of pressure solution. Displayed in eastern Berryville, outside at a hardware store.

Dr. Or M. Bialik Aug 11, 2025

To assess the risk of floods, we need detailed, long-term records, much longer than the instrumental record can offer. Geological record helps, but the time control on them isn't great. That calls for a different information source to constrain the events in those records, such as historical chronicles.

Link: https://www.sciencedirect.com/science/article/pii/S2666033425000255

#history #geology #sedimentary #flood