#sedimentary — Public Fediverse posts on home.social

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.

https://zenodo.org/records/15656179

#weekendreading #sedimentary #stratigraphy #environmental

Dr. Or M. Bialik @[email protected] · 2025-08-11 · 07:37 UTC

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

Peter Barnes @[email protected] · 2025-03-25 · 08:46 UTC

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

#rockintuesday #photography #geology #kakadu #rocks #patterns

Dr. Or M. Bialik @[email protected] · 2025-02-12 · 07:21 UTC

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.

#sedimentary #environment #ecological

Dr. Or M. Bialik @[email protected] · 2025-01-15 · 18:59 UTC

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

#climate #sedimentary #minerals

Dr. Or M. Bialik @[email protected] · 2024-12-16 · 15:46 UTC

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/

#phdposition #sedimentary

Dr. Or M. Bialik @[email protected] · 2024-10-22 · 12:41 UTC

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/

#sedimentary #energytransition

Dr. Or M. Bialik @[email protected] · 2024-09-01 · 12:44 UTC

Now live - #MinCup24 Round 1 Match 1: Kaolinite vs. Abelsonite. Not much of a fight if you ask me (#sedimentary bias).

https://www.mineralcup.org/2024/vote/r1m01

#mincup24 #sedimentary

Dr. Or M. Bialik @[email protected] · 2023-11-24 · 12:56 UTC

#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.

https://www.science.org/doi/10.1126/science.adh1215

#weekendreading #sedimentary #geochemistry

Chris White @[email protected] · 2023-10-06 · 23:29 UTC

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.

#sedimentary #neoproterozoic #squantum #roxbury #conglomerate #tillite

💧🌏 Greg Cocks @[email protected] · 2023-01-23 · 20:38 UTC

The Eye Of The Sahara - A Geological Mystery Staring Into Space
--
https://www.iflscience.com/the-eye-of-the-sahara-a-geological-mystery-staring-into-space-67179 <-- shared article
--
https://doi.org/10.1016/j.jafrearsci.2014.04.006 <-- shared paper
--
https://doi.org/10.1007/s12517-021-08734-4 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #satellite #Landsat #imagery #gischat #EyeOfTheSahara #vulcanism #intrusion #geology #Africa #RichatStructure #research #mauritania #structuralgeology #anticline #folding #sedimentary #igneous #formation #megabreccia #geologicalheritagesites

#gis #spatial #mapping #remotesensing #satellite #landsat

Chris White @[email protected] · 2023-06-03 · 00:57 UTC

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.

#Boston #fieldTrip #UMassBoston

#sedimentary #rock #photograph #neoproterozoic #squantum #roxbury

Chris White @[email protected] · 2023-05-30 · 23:40 UTC

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.

#clast #sedimentary #rocks #neoproterozoic #squantum #roxbury

BrownsBay @[email protected] · 2023-04-22 · 03:54 UTC

Rock on the beach at Barnum Point, Camano Island, WA. Conglomerate with subrounded cherty clasts in a dark matrix. Any sedimentary petrologists? Likely weathered out of till that caps the bluffs or a dropstone from floating ice on marine water incursion during the Everson interstade. Source rock provenance not known. Ref. Geologic map of the Juniper Beach 7.5-minute quadrangle, WDGER Geologic Map GM70. #geology #sedimentary #conglomerate #iceage #glaciation #PNW #washingtonstate #CamanoIsland

#geology #sedimentary #conglomerate #iceage #glaciation #pnw

David Naylor @[email protected] · 2022-12-28 · 16:27 UTC

Interesting colors and contrast between #sedimentary layers and #igneous intrusions in the Gravel Hills of the #Mojave Desert.
From Tom Dibblee (1968),
https://openlibrary.org/books/OL256760M/Geology_of_the_Fremont_Peak_and_Opal_Mountain_quadrangles_California
the layers are part of the Pickhandle and Barstow formations laid down in the Miocene. The darker purplish rock is an intrusion of #rhyolitic #breccia.
If the rock colors appear familiar you may have seen similar combinations of these formations in the Opal Mountains, Rainbow Basin, and Calico Mountains near Barstow, CA.

#igneous #sedimentary #mojave #rhyolitic #breccia

Chris White @[email protected] · 2022-12-21 · 14:02 UTC

Pleistocene glacial striations on Devonian and Neoproterozoic rock in New England. Savin Hill, Middlesex Fells, and Mt Monadnock. See captions for details.

#rocks #glaciology #Boston #MiddlesexFells #MountMonadnock #sedimentary #Medford #Neoproterozoic #Devonian #Pleistocene

#rocks #glaciology #boston #middlesexfells #mountmonadnock #sedimentary

Chris White @[email protected] · 2022-12-20 · 00:59 UTC

Last set of examples of soft sediment deformation in the. Squantum Member of the Roxbury Conglomerate, Boston Bay Group; Neoproterozoic and approximately contemporaneous with Gaskiers glaciation.

Although previously interpreted as a tillite (it is still sometimes referred to as the “Squantum Tillite), the “consensus” is now debris flows and turbidites.

#geology #sedimentology #turbidites #glaciology #Boston #Neoproterozoic #geosciences #sedimentary #rocks

#geology #sedimentology #turbidites #glaciology #boston #neoproterozoic

Chris White @[email protected] · 2022-12-18 · 19:28 UTC

Possible dropstone in the Neoproterozoic Squantum Member of the Roxbury Conglomerate, Quincy, Massachusetts USA. See previous posts for more background.
#geology #glaciology #turbidites #Neoproterozoic #sedimentary #conglomerate #rocks

#geology #glaciology #turbidites #neoproterozoic #sedimentary #conglomerate

Mike Tyka @[email protected] · 2023-01-21 · 20:46 UTC

We have identified a new type of #sedimentary rock, a kind of #conglomerate of various organic #hydrocarbon #polymers. I forms over time and under influence of pressure at the bottom of the kids' toy box.

#polymers #hydrocarbon #conglomerate #sedimentary

Paleo Priest 🇪🇺🏳️‍🌈 @[email protected] · 2023-06-08 · 06:40 UTC

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

#paleo #paleontology #geo #geology #thinsections #sedimentary

💧🌏 Greg Cocks @[email protected] · 2025-04-08 · 04:24 UTC

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

#gis #spatial #mapping #water #hydrology #quaternary

💧🌏 Greg Cocks @[email protected] · 2025-04-08 · 04:24 UTC

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

#gis #spatial #mapping #water #hydrology #quaternary

💧🌏 Greg Cocks @[email protected] · 2025-04-08 · 04:24 UTC

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

#precipitation #rainfall #terrace #cliff #delta #dating

💧🌏 Greg Cocks @GregCocks · 2025-04-08 · 04:24 UTC

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

#gis #spatial #mapping #water #hydrology #quaternary

Sandy McClearn @[email protected] · 2022-11-17 · 11:41 UTC

I’m no geologist, but I love the sedimentation layers laid down in this cliff face outside #ArcticBay on #AdmiraltyInlet on #BaffinIsland in #Nunavut. Wow! #geology #cliff #arctic #north #sediment #sedimentary #layers #rock #landscapephotography #seascapephotography

#arcticbay #admiraltyinlet #baffinisland #nunavut #geology #cliff

Chris White @[email protected] · 2022-12-19 · 16:57 UTC

Overturned soft sediment folds in the Neoproterozoic Squantum Member of the Roxbury Conglomerate, Boston Bay Group.

The tight folding (center left) is widely currently interpreted as occurring in a debris flow. White balance card held by a student on a field trip for “Earth’s Dynamic Systems” at U Mass Boston this semester. Squantum Head, Quincy, Massachusetts USA. My photo.

#turbidites #geology #sedimentary #geosciences #boston #UMassBoston #EnvironmentalScience

#turbidites #geology #sedimentary #geosciences #boston #umassboston

Chris White @[email protected] · 2023-10-06 · 23:29 UTC

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.

#sedimentary #neoproterozoic #squantum #roxbury #conglomerate #tillite

Chris White @[email protected] · 2023-10-06 · 23:29 UTC

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.

#sedimentary #neoproterozoic #squantum #roxbury #conglomerate #tillite

Chris White @[email protected] · 2023-10-06 · 23:29 UTC

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.

#umassboston #glacier #gaskiers #tillite #conglomerate #roxbury

Chris White @[email protected] · 2023-10-06 · 23:29 UTC

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.

#sedimentary #neoproterozoic #squantum #roxbury #conglomerate #tillite

Chris White @[email protected] · 2023-06-03 · 00:57 UTC

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.

#Boston #fieldTrip #UMassBoston

#sedimentary #rock #photograph #neoproterozoic #squantum #roxbury

Chris White @[email protected] · 2023-06-03 · 00:57 UTC

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.

#Boston #fieldTrip #UMassBoston

#sedimentary #rock #photograph #neoproterozoic #squantum #roxbury

Chris White @[email protected] · 2023-06-03 · 00:57 UTC

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.

#Boston #fieldTrip #UMassBoston

#umassboston #fieldtrip #boston #photo #turbidite #debrite