April 2019 PMID 30936306

A seismically induced onshore surge deposit at the KPg boundary, North Dakota.

Robert A DePalma, Jan Smit, David A Burnham, Klaudia Kuiper, Phillip L Manning, Anton Oleinik, Peter Larson, Florentin J Maurrasse, Johan Vellekoop, Mark A Richards, Loren Gurche, Walter Alvarez

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Mentions

429

Peak: 55 in Apr 2019

across 6 sources since Apr 2019

Extended reach

1,910,730

potential audience

Total likes

33,464

Video views

1,586,019

Mentions per month

Apr 2019 – Apr 2025

Where it's discussed

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AI synopsis

What people are saying

Discussions overwhelmingly agree on the significance of the article, with phrases like 'fascinating,' 'game-changer,' and 'most remarkable scientific discovery,' indicating high interest and impact. Examples include references to detailed evidence like impact ejecta, seismically induced surges, and dinosaur fossils linked to the impact day, highlighting active, in-depth engagement with the research's implications.

AgreementStrong agreement

Most discussions strongly support the significance of the findings, emphasizing its importance in understanding dinosaur extinction and impact effects.

InterestHigh interest

Posts show high curiosity and enthusiasm, highlighted by phrases like 'fascinating,' 'amazing,' and 'highly recommended,' indicating strong engagement with the subject.

EngagementHigh engagement

Many users cite specific details from the article, mentioning the evidence of impact ejecta, the date of the impact, and the implications for extinction, reflecting deep involvement.

ImpactHigh impact

The discussions consistently portray the paper as a groundbreaking discovery, suggesting it could reshape our understanding of the end-Cretaceous events and Earth’s history.

Abstract in brief

The study describes a high-energy onshore surge deposit in North Dakota's Hell Creek Formation, which is linked to the Chicxulub impact event, helping to clarify the immediate environmental effects of the asteroid strike.
The deposit contains ejecta and iridium-rich impactite, and evidence such as trapped ejecta spherules in fish gills suggests it was caused by a seismic wave-induced inundation, not a tsunami, occurring about an hour after impact.
These findings provide a detailed chronology of the initial aftermath of the Chicxulub impact, highlighting a combination of marine and terrestrial sediments and revealing how seismic waves may have triggered widespread environmental disruptions.]

Read the full abstract

All mentions

Impact Timing of Asteroid That Ended the Dinosaurs

If the 10-kilometer asteroid that struck Earth 66 million years ago had hit just a few minutes later, could the outcome for living creatures have changed? Hosted by Stefan Chin, this video explores the implications of…

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Edmontosaurus Mummy Reveals New Insights on Soft Tissue Preservation

A recent study on an Edmontosaurus mummy shows that soft tissue preservation can occur without extreme conditions like rapid burial. This video explores how desiccation and incomplete scavenging contributed to the…

Ben G Thomas · Apr 6, 2025 601,994 views

Early Freshwater Ecosystems After the Cretaceous-Paleogene Boundary

A new large gar species was discovered near the KPg boundary, indicating that healthy freshwater ecosystems persisted shortly after the asteroid impact. This find suggests rapid recovery of North American freshwater…

Jackson Wheat · Aug 26, 2022 1,388 views

Reylo

@98erikalex · X

RT @nobulart: Extraterrestrial impact ejecta found in the gills of fish that died in the Chicxulub impact event. This is a fascinating pape…

Jun 29, 2024 · 2 shares · 670 followers View post →

Hope Larkin-Begley

@HopeBegley · X

RT @nobulart: Extraterrestrial impact ejecta found in the gills of fish that died in the Chicxulub impact event. This is a fascinating pape…

Jun 24, 2024 · 2 shares · 2,778 followers View post →

Craig Stone

@nobulart · X

Jun 22, 2024 · 8 likes · 2 shares · 19,090 followers View post →

I am the fermiparadox

@ActuallyMrWest · X

@Halsted22101 @KvotheTheArcane Give this a read sometime then! https://t.co/Lo2XMArfy5 https://t.co/lE6HX5Sdv9

Oct 16, 2023 · 1 like · 2,728 followers View post →

████████

@EndofLine369 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota E.L.E. (Extinction Level Event) https://t.co/FV13gjQ67P

Apr 24, 2023 · 1,490 followers View post →

█████ ████████

@Redacted369 · X

It is distinguished by impact-related debris, including a distinctive iridium anomaly, shocked minerals, ejecta spherules, microkrystites, nanodiamonds, and occasionally unaltered impact-melt glass (2, 23 https://t.co/br22eYsMHR https://t.co/9ySc2JsNzP

Aug 29, 2022 · 887 followers View post →

Phil

@Phil_Free_ · X

RT @policytensor: In any case, we have high-resolution "snapshot" of the last day of the Cretaceous in the "mass-death" assemblage at Tanis…

Aug 16, 2022 · 1 share · 4,410 followers View post →

Policy Tensor

@policytensor · X

In any case, we have high-resolution "snapshot" of the last day of the Cretaceous in the "mass-death" assemblage at Tanis. The "Event Deposit" is, without a shred of doubt, the most remarkable scientific discovery of our lifetimes. https://t.co/ROWsWJsayL. https://t.co/RB9hAzavwh

Aug 16, 2022 · 1 share · 13,145 followers View post →

Ricardo Alvarez

@Ricardo79633196 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/isBW4Vg13x

May 17, 2022 View post →

didaclopez

@didaclopez · X

@prsnlluk M'agraden aquestes notícies on has de passar per tres o quatre pàgines abans d'arribar al lloc on s'afirma el que diuen que s'afirma. https://t.co/qSQDZwldI4

May 15, 2022 · 1 like · 3,438 followers View post →

Reddit Journal of Science

@rsciencejournal · X

The first known dinosaur fossil linked to the very day of the Chicxulub impact is reported by paleontologists at the Tanis site in North Dakota. https://t.co/7o0fFQSXNV #science #paleontology #fossil #day #chicxulub #impact

May 5, 2022 · 1 like · 335 followers View post →

WGCG

@WGCG_UK · X

Time to drill down into the nuts and bolts science of Tanis, after that documentary. https://t.co/o0NpdZOimB

Apr 25, 2022 · 2,405 followers View post →

João

@CoelhoPre · X

@Albertossauro https://t.co/SgRGDRFqrw

Apr 19, 2022 · 1 like · 2,629 followers View post →

Laurent Cheylus

@lcheylus · X

Pristine Slivers of the Impactor that killed the Dinosaurs have been discovered in a North Dakota site that is a Time Capsule of that calamitous day 66 million years ago https://t.co/YnFCmt7G0O

Apr 16, 2022 · 3,247 followers View post →

87lbofbees

@87lbofbees · X

This is cool, didn’t know about this site https://t.co/86vE7cqGbi

Apr 13, 2022 · 4 likes · 4,419 followers View post →

gikyou

@gikyou9 · X

RT @ikejiri_paleo: この白亜紀末ノ一スダコタ州化石現場の概要は2019年の論文参照。 https://t.co/KKBr6ZprKe A seismically induced onshore surge deposit at the KPg bounda…

Apr 12, 2022 · 1 share · 254 followers View post →

池尻武仁（博士）

@ikejiri_paleo · X

この白亜紀末ノ一スダコタ州化石現場の概要は2019年の論文参照。 https://t.co/KKBr6ZprKe A seismically induced onshore surge deposit at the KPg boundary, North Dakota. R. A. DePalma, et al. 2019. Proceedings of the National Academy of Sciences Vol. 116 Issue 17 Pages 8190-8199

Apr 11, 2022 · 1 like · 1 share · 712 followers View post →

Daspletoraptor

@daspletoraptor · X

The article is open access. Read it if you want. https://t.co/59iesqunC9

Apr 6, 2022 · 2 likes · 2,148 followers View post →

Daspletoraptor

@daspletoraptor · X

@batteethh This was linked to the article. I'm not aware of anything specific to the Thescelosaurus. https://t.co/59iesqunC9

Apr 6, 2022 · 1 like · 2,148 followers View post →

Sergii Tukaiev

@byzant69 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/J5IHfyiKJG

Mar 2, 2022 · 170 followers View post →

Travis Statham

@Travis_Statham · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/ovBu1GJNZc https://t.co/XZJ1FCcVXX Great read if you like dinosaurs and science and extraordinary evidence.

Mar 15, 2021 · 1 like · 12,704 followers View post →

Miss_Zelda

@pantieprincess4 · X

Dec 22, 2019 · 5 likes · 84,172 followers View post →

Erik Pearson, MD FACS

@citizensurgeon · X

And here is the paper that goes along with it. An absolutely fascinating history of our planet on its darkest day. A seismically induced onshore surge deposit at the KPg boundary, North Dakota | PNAS https://t.co/ytgdNboRQm

Nov 11, 2019 · 1 like · 1,085 followers View post →

Aaron Bateman

@schizrade · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/OCQjKkNjQb

Jun 5, 2019 · 1 like · 557 followers View post →

Colin Doherty

@gastaut · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/u6U5naNbWO

May 26, 2019 · 2,905 followers View post →

Stijn_V_H

@stijnfest616 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota | PNAS - https://t.co/txsBOacWsk

May 21, 2019 · 438 followers View post →

distracted_alien

@distractedalien · X

1 . A seismically induced onshore #surge #deposit at the #KPg #boundary , #North #Dakota..https://t.co/o9xMYNwRM1

May 9, 2019 · 407 followers View post →

PGS

@PghGeoSociety · X

One story of the hours following the Chicxulub impact emerges out of North Dakota. The info in the article was also summarized dramatically on the May 2, 2019 Radiolab podcast. A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/rs9u6BS6Bp

May 8, 2019 · 64 followers View post →

Galderic Lastras

@galderic77 · X

AMAZING. Freshwater fishes with tektites in their gills, mixed with marine ammonites, all deposited by seismic seiches minutes after the Chicxulub impact. "A seismically induced onshore surge deposit at the KPg boundary, North Dakota" https://t.co/GvYqEecOMP

May 6, 2019 · 2 likes · 379 followers View post →

Ernesto

@Souto002 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota | PNAS https://t.co/LCU7PiYUlB

Apr 20, 2019 · 57 followers View post →

STEM

@SodaliteJatholo · X

@Spottacus A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/7tgTdIJSJw

Apr 12, 2019 · 233 followers View post →

Science Furs

@Sci_Furs · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/DBYApjJpVy

Apr 12, 2019 · 1 like · 2,277 followers View post →

Kevin Dayton

@DaytonPubPolicy · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/NUyU3n8qjg The Day the Dinosaurs Died (They Think) https://t.co/I7n57DDwdu

Apr 10, 2019 · 3,968 followers View post →

Masakazu Sekijima

@m_sekijima · X

Apr 10, 2019 · 2 likes · 6,395 followers View post →

Brittia GUIRIEC

@BrittiaGUIRIEC · X

RT @jgilchrist13: ... the paper: A seismically induced onshore surge deposit at the KPg boundary, North Dakota via @PNASNews. https://t.co/…

Apr 10, 2019 · 1 share · 847 followers View post →

Jason Gilchrist

@jgilchrist13 · X

Apr 9, 2019 · 4 likes · 1 share · 2,677 followers View post →

Prof. Dr. Michaela Spiske

@TsunamiSand · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/VrRiJsWpUe Highly recommended - and do not miss to look at the supplementary information which documents the tsunami deposits!

Apr 9, 2019 · 487 followers View post →

Dr S. Yoshi Maezumi

@yoshi_maezumi · X

Just out in PNAS: Fascinating read on the hour the dinosaurs died. A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/sDjrJJlfAj

Apr 8, 2019 · 1 like · 2,176 followers View post →

Aaldrik A3 van der Veen

@a3veen · X

Agenda - Spectaculaire fossielen gevonden na meteorietinslag / A seismically induced onshore surge deposit at the KPg boundary, North Dakota - publication https://t.co/2c88XOgljO

Apr 8, 2019 · 214 followers View post →

Kees l'Olandese

@caseiokey · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/gpLZdXTbld

Apr 7, 2019 · 737 followers View post →

ugo morelli

@UgoMorelli · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota | PNAS https://t.co/xcEzDsIqmm

Apr 6, 2019 · 3,446 followers View post →

J. McLaughlin

@cardcounterswin · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/QpBPWIhCMn

Apr 5, 2019 · 1,040 followers View post →

John hand

@johnhand9 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/BPY1LJJiHu

Apr 4, 2019 · 1,082 followers View post →

asteroidenbergbauer

@deepspaceminer · X

https://t.co/sOxoJzP1AW A seismically induced onshore surge deposit at the KPg boundary, North Dakota

Apr 4, 2019 · 183 followers View post →

Eneko Iriarte

@EnekoIriarte · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/WnCecfs7tD

Apr 4, 2019 · 2 likes · 838 followers View post →

Alex G Kesaris

@Sustenant · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota | PNAS https://t.co/RHJXMxsINR

Apr 3, 2019 · 658 followers View post →

Stephen Pimentel

@StephenPiment · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/R2DaCZ3UGc

Apr 3, 2019 · 12,810 followers View post →

Alexander Prescott, PhD

@garden_ap · X

@dontpanicgeo Hey, love the podcast! Any plans to discuss this fascinating new paper? It's not directly related to the impact crater, but certainly relates to the impact! https://t.co/93zLBQd45v

Apr 3, 2019 · 80 followers View post →

AndreaR

@gacchan74 · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/SsKBS82D2F

Apr 3, 2019 · 171 followers View post →

Project Astrolabe

@IcarusAstrolabe · X

"A seismically induced onshore surge deposit at the KPg boundary, North Dakota" by Robert A. DePalma, et al. https://t.co/AqScyMZUeD The paper is open access at this time. https://t.co/VxQdBUY204

Apr 3, 2019 · 487 followers View post →

Penny Higgins

@paleololigo · X

This paper, published yesterday (but not an April Fool's joke) is the assigned reading for this week: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/urkoQ8b7WM

Apr 2, 2019 · 1,236 followers View post →

Tucker Goodrich

@TuckerGoodrich · X

"A seismically induced onshore surge deposit at the KPg boundary, North Dakota" https://t.co/EWeoozOYNP

Apr 2, 2019 · 28,300 followers View post →

Victoria Egerton

@DrVEgerton · X

RT @UoMOpenAccess: ✨

Apr 2, 2019 · 3 shares · 424 followers View post →

Jim French

@Selago · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota | PNAS https://t.co/GFin3VQ6lr

Apr 2, 2019 · 530 followers View post →

UoM Library

@UoMLibrary · X

RT @UoMOpenAccess: ✨

Apr 2, 2019 · 3 shares · 13,013 followers View post →

W J Hayes

@WJHayesJr · X

The PhD student, Robert DiPalma's paper (co-authored w/ 8 others), "A seismically induced onshore surge deposit at the KPg boundary, North Dakota" is now available: 2/3 https://t.co/hiqd1xpCsP

Apr 2, 2019 · 1 like · 202 followers View post →

Gabriel Erni Cassola

@GabCassola · X

Fascinating: Researchers found a mass grave with animals and plants that died directly as a consequence of the meteorite strike that killed the dinosaurs! A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/TTKt5Gv2Pu

Apr 2, 2019 · 203 followers View post →

Tangmo Mopet

@TMtheEQplusNerd · X

RT @TomHoltzPaleo: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 2, 2019 · 6 shares · 1,991 followers View post →

Sarah Everts

@saraheverts · X

RT @HooseHere: Interested to read folks' thoughts on the findings now that the K-Pg paper is out, but here is one other oddity on the #SciC…

Apr 2, 2019 · 1 share · 2,426 followers View post →

Steve Carlton

@UoML_Steve · X

RT @UoMOpenAccess: ✨

Apr 2, 2019 · 3 shares · 274 followers View post →

UoM Open Research

@UoMOpenResearch · X

✨

Apr 2, 2019 · 2 likes · 3 shares · 1,285 followers View post →

Carlos Góis-Marques

@CGoisMarques · X

RT @TomHoltzPaleo: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 2, 2019 · 6 shares · 1,101 followers View post →

Jennifer Cooling

@palynojen · X

A fascinating read on the end Cretaceous extinction. The supplemental material even has some neat #palynology and #paleoflora buried in there. A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/hkR3yIiFrk

Apr 2, 2019 · 161 followers View post →

Wolfgang Wanderer

@wofl_wanderer · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/uKP1SivJSb

Apr 2, 2019 · 42 followers View post →

Jonah Busch

@jonahbusch · X

#nowreading A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/Yi6vAoU9HT

Apr 1, 2019 · 3,704 followers View post →

New Scientist Zone

@NewScientistZon · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/hGhjHNbeT4

Apr 1, 2019 · 178 followers View post →

Sherry Chandy MD

@DrSherryChandy · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/NDop1Au0V9 https://t.co/0rHPHoFCB5

Apr 1, 2019 · 339 followers View post →

David Rich

@rockyboulders · X

RT @asteroidanalyst: The pre-print on this paper has been published through @PNASNews. "A seismically induced onshore surge deposit at the…

Apr 1, 2019 · 1 share · 327 followers View post →

Science news

@UpdateonScience · X

https://t.co/K2ovTTROYW Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota #sciencenews https://t.co/4ieTcnD00r

Apr 1, 2019 · 1,877 followers View post →

Asteroid☄️Analytics

@asteroidanalyst · X

The pre-print on this paper has been published through @PNASNews. "A seismically induced onshore surge deposit at the KPg boundary, North Dakota" (Robert DePalma et al 2019) https://t.co/1PMaE5Fapd

Apr 1, 2019 · 1 like · 1 share · 247 followers View post →

α∂нυнαм αнмє∂

@8dhu · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/drzfWNNrZw https://t.co/oSgtgOw887

Apr 1, 2019 · 920 followers View post →

Natalie van Hoose

@HooseHere · X

Interested to read folks' thoughts on the findings now that the K-Pg paper is out, but here is one other oddity on the #SciComm end: New Yorker's Douglas Preston is thanked in the acknowledgements section. https://t.co/YhB1OT27Ei

Apr 1, 2019 · 1 like · 1 share · 1,747 followers View post →

localhostscience

@localhostsci · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota

Apr 1, 2019 · 34 followers View post →

⚡️YOU SCIENCE ⚡️

@YouScienceLIVE · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota via /r/science https://t.co/9vcM3LDJdr

Apr 1, 2019 · 1,019 followers View post →

Pit Tobkins

@SEOPit · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/e7PB6C0w7z #science

Apr 1, 2019 · 98 followers View post →

Mike

@michaelscally · X

[OA] Prelude to Extinction: A Seismically Induced Onshore Surge Deposit at the KPg Boundary, North Dakota The Chicxulub impact played a crucial role in the Cretaceous–Paleogene extinction. However the earliest... https://t.co/xRg7N7Owse

Apr 1, 2019 · 894 followers View post →

Dr. Claudia Serrano

@paleoduck · X

RT @TomHoltzPaleo: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 1, 2019 · 6 shares · 640 followers View post →

@keeseycomics@sauropods.win

@PaleoceneComic · X

A direct record from the Day the World Ended: https://t.co/8BaclQcivh

Apr 1, 2019 · 1,451 followers View post →

Cameron Muskelly (Explorer of Deep Time)

@PaleoCameron · X

RT @TomHoltzPaleo: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 1, 2019 · 6 shares · 11,838 followers View post →

Zaka, When the Walls Fell

@zmiller1902 · X

RT @TomHoltzPaleo: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 1, 2019 · 6 shares · 747 followers View post →

Will Wompoto

@WompotoWill · X

Possible evidence for the dinosaur-killing impact: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/IMWRkvMzNe

Apr 1, 2019 · 42 followers View post →

Andras Toth

@tothur · X

The #Tanis K-Pg paper is finally available: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/3XzmCcTLSg

Apr 1, 2019 · 1 like · 1,811 followers View post →

Wendy

@cryptowendyy09 · X

RT @TomHoltzPaleo: A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 1, 2019 · 6 shares · 2,721 followers View post →

Thomas R. Holtz, Jr.

@TomHoltzPaleo · X

A seismically induced onshore surge deposit at the KPg boundary, North Dakota https://t.co/CFNJchEJjq Here it is: #Tanis

Apr 1, 2019 · 30 likes · 6 shares · 32,073 followers View post →

A seismically induced onshore surge deposit at the KPg boundary, North Dakota.

Mentions per month

Where it's discussed

What people are saying

Abstract in brief

Top posts

All mentions

Impact Timing of Asteroid That Ended the Dinosaurs

Edmontosaurus Mummy Reveals New Insights on Soft Tissue Preservation

Early Freshwater Ecosystems After the Cretaceous-Paleogene Boundary