#sedimentary — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #sedimentary, aggregated by home.social.
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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 -
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 -
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
--
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 -
Late Quaternary Variations in the Level of Paleo-Lake Malheur, Eastern Oregon
--
https://doi.org/10.1006/qres.1998.2005 <-- shared paper
--
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 -
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
--
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 -
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 -
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 -
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 -
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 -
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
--
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 -
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 -
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 -
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 -
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 -
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
--
#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 -
Crack in the layered rock at Treman State Park
#photo #photography #blackandwhite #monochromemonday #monochrome #rocks #ithaca #upstateny #sedimentary #gorge #treman
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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
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A special #WeekendReading for the date - my dissertation! An unhinged monograph written with too much coffee and not enough sleep about #sedimentary cycliciy, evaporite sequence #stratigraphy, and #environmental reconstruction of the awesomely named Triassic Mohilla Fm.
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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 -
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 -
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
--
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 -
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
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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 -
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 -
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
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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 -
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).
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#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.
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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.
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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.
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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.
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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.
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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.
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I am trying to identify fossils in these thin sections of Silurian sedimentary rocks from Lithuania. Any ideas? I am still learning and lacking so much in experience… 🥺
I think I got the Crinoids right and some Bryozoas, but that’s it.
.
Also, next to these there are some nice cathodoluminescence photos of the same thin sections 🤩 You can see growth zones in them!#paleo #paleontology #geo #geology #thinsections #sedimentary #microscopy #micro #microfossils #fossils #crinoids #bryozoa
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I am trying to identify fossils in these thin sections of Silurian sedimentary rocks from Lithuania. Any ideas? I am still learning and lacking so much in experience… 🥺
I think I got the Crinoids right and some Bryozoas, but that’s it.
.
Also, next to these there are some nice cathodoluminescence photos of the same thin sections 🤩 You can see growth zones in them!#paleo #paleontology #geo #geology #thinsections #sedimentary #microscopy #micro #microfossils #fossils #crinoids #bryozoa
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I am trying to identify fossils in these thin sections of Silurian sedimentary rocks from Lithuania. Any ideas? I am still learning and lacking so much in experience… 🥺
I think I got the Crinoids right and some Bryozoas, but that’s it.
.
Also, next to these there are some nice cathodoluminescence photos of the same thin sections 🤩 You can see growth zones in them!#paleo #paleontology #geo #geology #thinsections #sedimentary #microscopy #micro #microfossils #fossils #crinoids #bryozoa
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I am trying to identify fossils in these thin sections of Silurian sedimentary rocks from Lithuania. Any ideas? I am still learning and lacking so much in experience… 🥺
I think I got the Crinoids right and some Bryozoas, but that’s it.
.
Also, next to these there are some nice cathodoluminescence photos of the same thin sections 🤩 You can see growth zones in them!#paleo #paleontology #geo #geology #thinsections #sedimentary #microscopy #micro #microfossils #fossils #crinoids #bryozoa
-
I am trying to identify fossils in these thin sections of Silurian sedimentary rocks from Lithuania. Any ideas? I am still learning and lacking so much in experience… 🥺
I think I got the Crinoids right and some Bryozoas, but that’s it.
.
Also, next to these there are some nice cathodoluminescence photos of the same thin sections 🤩 You can see growth zones in them!#paleo #paleontology #geo #geology #thinsections #sedimentary #microscopy #micro #microfossils #fossils #crinoids #bryozoa
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Anomalous pebble in layered #sedimentary #rock
An angular pebble is conformably surrounded by argillaceous and sandy layers in this #photograph of the #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate. The wide range of clast sizes led to an interpretation as a #glacial #tillite thru the 1970s, but the Squantum Member is now mostly interpreted as a #debrisFlow (#debrite or #turbidite). My #photo.
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Anomalous pebble in layered #sedimentary #rock
An angular pebble is conformably surrounded by argillaceous and sandy layers in this #photograph of the #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate. The wide range of clast sizes led to an interpretation as a #glacial #tillite thru the 1970s, but the Squantum Member is now mostly interpreted as a #debrisFlow (#debrite or #turbidite). My #photo.
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Anomalous pebble in layered #sedimentary #rock
An angular pebble is conformably surrounded by argillaceous and sandy layers in this #photograph of the #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate. The wide range of clast sizes led to an interpretation as a #glacial #tillite thru the 1970s, but the Squantum Member is now mostly interpreted as a #debrisFlow (#debrite or #turbidite). My #photo.
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Anomalous pebble in layered #sedimentary #rock
An angular pebble is conformably surrounded by argillaceous and sandy layers in this #photograph of the #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate. The wide range of clast sizes led to an interpretation as a #glacial #tillite thru the 1970s, but the Squantum Member is now mostly interpreted as a #debrisFlow (#debrite or #turbidite). My #photo.
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Anomalous pebble in layered #sedimentary #rock
An angular pebble is conformably surrounded by argillaceous and sandy layers in this #photograph of the #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate. The wide range of clast sizes led to an interpretation as a #glacial #tillite thru the 1970s, but the Squantum Member is now mostly interpreted as a #debrisFlow (#debrite or #turbidite). My #photo.
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Rapid changes in #clast size in #sedimentary #rocks
The #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate (#Boston Bay Group) transitions from sandstone, to almost-clast-supported conglomerate, to laminated argillite…in about 25 cm. Fifty years ago, it was interpreted as a #glacial deposit and called the Squantum #Tillite, presumably associated with the #Gaskiers Glaciation. Paucity of evidence (e.g., few scratches or faceted clasts) suggests a debris flow. My #photo.
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Rapid changes in #clast size in #sedimentary #rocks
The #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate (#Boston Bay Group) transitions from sandstone, to almost-clast-supported conglomerate, to laminated argillite…in about 25 cm. Fifty years ago, it was interpreted as a #glacial deposit and called the Squantum #Tillite, presumably associated with the #Gaskiers Glaciation. Paucity of evidence (e.g., few scratches or faceted clasts) suggests a debris flow. My #photo.
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Rapid changes in #clast size in #sedimentary #rocks
The #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate (#Boston Bay Group) transitions from sandstone, to almost-clast-supported conglomerate, to laminated argillite…in about 25 cm. Fifty years ago, it was interpreted as a #glacial deposit and called the Squantum #Tillite, presumably associated with the #Gaskiers Glaciation. Paucity of evidence (e.g., few scratches or faceted clasts) suggests a debris flow. My #photo.
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Rapid changes in #clast size in #sedimentary #rocks
The #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate (#Boston Bay Group) transitions from sandstone, to almost-clast-supported conglomerate, to laminated argillite…in about 25 cm. Fifty years ago, it was interpreted as a #glacial deposit and called the Squantum #Tillite, presumably associated with the #Gaskiers Glaciation. Paucity of evidence (e.g., few scratches or faceted clasts) suggests a debris flow. My #photo.
-
Rapid changes in #clast size in #sedimentary #rocks
The #Neoproterozoic #Squantum Member of the #Roxbury Conglomerate (#Boston Bay Group) transitions from sandstone, to almost-clast-supported conglomerate, to laminated argillite…in about 25 cm. Fifty years ago, it was interpreted as a #glacial deposit and called the Squantum #Tillite, presumably associated with the #Gaskiers Glaciation. Paucity of evidence (e.g., few scratches or faceted clasts) suggests a debris flow. My #photo.