February 1984 PMID 6583680

Periodicity of extinctions in the geologic past.

D M Raup, J J Sepkoski

Mentions

27
Peak: 4 in Dec 2024
across 6 sources since Apr 2019

Extended reach

159,785
potential audience

Total likes

3,780

Video views

144,999

Mentions per month

Apr 2019 – Dec 2025

Where it's discussed

  • X / Twitter10 posts
  • Facebook10 posts
  • News3 articles
  • YouTube2 videos
  • Bluesky1 posts
  • Blogs1 articles

AI synopsis

What people are saying

The overall tone reflects respect for past research, like the mention of Raup and Sepkoski's 1983 study and theories such as the Nemesis hypothesis, with some posts expressing admiration and familiarity. Many comments are brief or reference external sources, indicating moderate engagement rather than deep analysis or controversy.

AgreementModerate agreement

Most participants acknowledge the historical significance of Raup and Sepkoski's research and the periodicity findings, expressing support or curiosity.

InterestModerate interest

The discussions reflect some interest in the topic, with mentions of historical research and related theories, but overall engagement seems moderate.

EngagementNeutral engagement

There is minimal deep discussion or analysis; some posts share references and praise, but few delve into detailed implications or critique.

ImpactNeutral impact

The collective responses do not indicate a major shift in perspective or wide-reaching influence but show recognition of the topic's importance in paleontology.

Abstract in brief

  • The study analyzed the timing of major extinctions over the past 250 million years and found a statistically significant pattern, occurring approximately every 26 million years.
  • The 12 extinction events studied include notable ones linked to meteorite impacts, such as the terminal Cretaceous and Late Eocene extinctions.
  • The exact causes of this roughly 26-million-year cycle are unknown, but researchers suggest they might be related to extraterrestrial influences like solar or galactic forces.]

Top posts

Most liked on X and Bluesky
Darksun
@0xblacksun · X

after all, David Raup and Jack Sepkoski researched the weird intervals of mass extinctions in 1983 they speculated that "extraterrestrial forces" could have an influence you can read their paper here: https://t.co/3WyFmE3Axs

Dec 13, 2024 · 21 likes · 3 shares · 5,776 followers View post →
Warren Platts
@WarrenPlatts · X

@peterrhague I had a couple of professors who proposed a 23 million year "Nemesis". https://t.co/ltRpCnQYfo https://t.co/8cxaZCO334

Jun 12, 2024 · 3 likes · 7,155 followers View post →
Dr. Teddy Kareta
@teddykareta.bsky.social · Bluesky

giving my students a fun lecture on what did in the dinosaurs tomorrow which means it's time to refresh myself on all the fun ideas which were super super wrong

Oct 7, 2025 · 2 likes · 1 share View post →
Akechii (boss arc)
@krabbypancakes · X

RT @0xblacksun: after all, David Raup and Jack Sepkoski researched the weird intervals of mass extinctions in 1983 they speculated that "e…

Dec 13, 2024 · 3 shares · 452 followers View post →
Chandler Calloway
@blueridgeexp · X

@david_wilcock https://t.co/B5qiXIJO59

Sep 8, 2024 · 428 followers View post →
GeoScience.net
@GeoSciences · X

Periodicity of extinctions in the geologic past https://t.co/exa2LqfMjE

Feb 27, 2022 · 403 followers View post →

All mentions

Dr. Teddy Kareta
@teddykareta.bsky.social · Bluesky

giving my students a fun lecture on what did in the dinosaurs tomorrow which means it's time to refresh myself on all the fun ideas which were super super wrong

Oct 7, 2025 · 2 likes · 1 share View post →
Apostolos
@Apostol_Sol · X

RT @0xblacksun: after all, David Raup and Jack Sepkoski researched the weird intervals of mass extinctions in 1983 they speculated that "e…

Dec 13, 2024 · 3 shares · 301 followers View post →
Akechii (boss arc)
@krabbypancakes · X

RT @0xblacksun: after all, David Raup and Jack Sepkoski researched the weird intervals of mass extinctions in 1983 they speculated that "e…

Dec 13, 2024 · 3 shares · 452 followers View post →
God is great
@Alyusrba3d3usr · X

RT @0xblacksun: after all, David Raup and Jack Sepkoski researched the weird intervals of mass extinctions in 1983 they speculated that "e…

Dec 13, 2024 · 3 shares · 90 followers View post →
Darksun
@0xblacksun · X

after all, David Raup and Jack Sepkoski researched the weird intervals of mass extinctions in 1983 they speculated that "extraterrestrial forces" could have an influence you can read their paper here: https://t.co/3WyFmE3Axs

Dec 13, 2024 · 21 likes · 3 shares · 5,776 followers View post →
Chandler Calloway
@blueridgeexp · X

@david_wilcock https://t.co/B5qiXIJO59

Sep 8, 2024 · 428 followers View post →
Alexander Tan
@agtan · X

@david_wilcock https://t.co/5mxOSHcUdv

Aug 26, 2024 · 7 followers View post →
Alexander Tan
@agtan · X

@david_wilcock https://t.co/5mxOSHcmnX

Aug 26, 2024 · 7 followers View post →
Martin K Vieweg
@MKV1133 · X

@david_wilcock Hi David, I found the David Raup article: https://t.co/fZIz1uk28e Great and Good Work, David!

Aug 21, 2024 · 1 followers View post →
Warren Platts
@WarrenPlatts · X

@peterrhague I had a couple of professors who proposed a 23 million year "Nemesis". https://t.co/ltRpCnQYfo https://t.co/8cxaZCO334

Jun 12, 2024 · 3 likes · 7,155 followers View post →
GeoScience.net
@GeoSciences · X

Periodicity of extinctions in the geologic past https://t.co/exa2LqfMjE

Feb 27, 2022 · 403 followers View post →
Benton 2018 Hyperthermal Driven Mass Extinctions Killing Models ...
News

Natl Acad. Sci. USA 81, 801–805. (doi:10.1073/pnas.81.3.801) 7. Erlykin AD, Harper DAT, Sloan T, Wolfendale AW. 2017 Mass extinctions over the last 500 myr ...

Jan 4, 2026 View →
Mass Extinctions and Their Relationship With Atmospheric Carbon ...
Blogs

https://doi.org/10.1073/pnas.81.3.801. Renne, P. R., Deino, A. L., Hilgen, F. J., Kuiper, K. F., Mark, D. F., Mitchell, W. S., III, et al. (2013). Time ...

Jan 4, 2026 View →
A 27 5 My Underlying Periodicity Detected in Extinction Episodes of ...
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1224126. Proc Natl Acad Sci USA. 81:801–805. doi:10.1073/pnas.81.3.801. Tennant JP, Mannion PD, Upchurch P, Sutton MD, Price GD.2017. Biotic Raup DM ...

Jan 4, 2026 View →
On some of these theories, some need to revisit and delve into ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Nov 7, 2025 View →
Metacritic Journal for Comparative Studies and Theory is an open ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Jul 3, 2025 View →
Biological Recycling Theory - Sameh Mesallum
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org/10.1073/pnas.81.3.801 6. Hu, Y. et al. Comparative genomics reveals convergent evolution between the bamboo-eating giant and red pandas ...

May 31, 2025 View →
Well, the piece already works in theory xd
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Oct 8, 2024 View →
Review and Discussion of a Book about the Yeti and its Possible ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Feb 3, 2024 View →
Physicists Viktor Gorschov and Ana Makarieva published their first ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Nov 21, 2023 View →
Climatic_Disorder_DOTCOM #Science_Contributions: u My ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

May 12, 2023 View →
Friends, continuing the topic of the theory of vortex (ring ...
Facebook

https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Sep 10, 2021 View →
¿Y si nuestro Sol tuviera una hermana? La fallida hipótesis de ...
News

doi:10.1073/pnas.81.3.801. ARCHIVADO EN: Espacio · Ciencia · Astronomía. ✕. Aceptar. 0Ver comentarios. Whatsapp; Facebook; Twitter; Envelope.

Apr 3, 2020 View →
**CREATURES AND FEATURES THAT EVOLUTION CAN'T ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Sep 16, 2019 View →
Jamb was wow.....I thank God... For those doing biology study ...
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https://doi.org/10.1073/pnas. 81.3.801 7. Cornetti, L. et al. Long-term balancing selection in crustacean immune genes. Nat. Commun. 15 ...

Apr 11, 2019 View →