Thomas R. Holtz, Jr.

Thomas R. Holtz, Jr.

@arctomet.bsky.social

Tyrannosaur Expert; Dinosaur Paleontologist; University of Maryland Geology Faculty; Director of the College Park Scholars-Science & Global Change Program; Science Author; Cat Dad; 🦖🦕

4,073 Followers 642 Following 2,338 Posts Joined Nov 2024
13 hours ago

Good to see a current US Senator talking this way.

(No sarcasm.)

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13 hours ago

When he’s right, he’s right.

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13 hours ago
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Trump Reportedly Forces His Top Officials To Wear The Same Shoes He Does—And The Pic Has The Internet Howling

So awkward!

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21 hours ago
A photo of a lesser Madagascar hedgehog tenrec  enrolled into a ball. The animal is grayish in color, with white spikes on its back and a long snout.

Did you know? The lesser Madagascar hedgehog tenrec is more closely related to elephants than true hedgehogs! Weighing ~0.25 lb (0.2 kg), this small mammal inhabits western Madagascar. It can roll up into a spiky ball to defend itself from foes.
Photo: Nigel Voaden, CC BY 4.0, iNaturalist

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22 hours ago
Graphic shows three line graph time series of monthly carbon dioxide abundance in ppm (blue line), monthly methane abundance in ppb (red line), and monthly nitrous oxide in ppb (purple line). Graphs are all shown from January 1984 through November 2025/February 2026. Current levels of CO2 are 429 ppm. Current levels of methane are 1946 ppb. Current levels of nitrous oxide are 339 ppb. All graphs show long-term increasing trends along with some interannual variability and seasonality.

The latest monthly status of key greenhouse gases shown side-by-side. These gases trap heat in our atmosphere and drive wide-ranging impacts across the Earth system.

For more data/info: gml.noaa.gov/ccgg/

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1 day ago

I spoke with an attorney who has been representing Epstein's survivors for decades: “Their focus instead appears to be on the important people — powerful people that are contained within these files and protecting them instead of protecting who needs the protection."
theintercept.com/2026/02/13/e...

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1 day ago
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Detection of dietary stress and geophagic behaviour forced by dry seasons in Miocene Gomphotherium Abstract. To access the impact of anthropogenic emissions and land use change on Earth's climate and biodiversity, studies into the environment and ecology of natural ecosystems during past warm perio...

bg.copernicus.org/articles/23/...

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1 day ago

Also, keep in mind that like extant crocodilians, non-avian dinosaurs may have had extensive parental care for hatchlings up to (maybe) yearlings, but after that, the kids would be on their own. (Technically birds do the same, but with their fast growth the young are adults by then!)

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1 day ago
YouTube
Rock Lobster YouTube video by The B-52's - Topic

#Geol204playlist For the Cambrian Explosion and Paleozoic Marine life (yes, I know: the species mentioned are all of Mesozoic or Cenozoic origin...) youtu.be/vz65vonktMA?...

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2 days ago

Very cool volunteer opportunity relative to Dinosaur National Monument!

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2 days ago
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Countries can rewild borders to deter invasions, says EU environment chief Jessika Roswall cites Poland and Finland, which have made border areas near Russia or its allies ‘more hostile’ to cross

Countries can rewild land borders to deter invasions, says EU environment chief

- Jessika Roswall cites Poland and Finland, which have made border areas near Russia or its allies ‘more hostile’ to cross

#rewilding
Story by @fionaharvey.bsky.social
www.theguardian.com/environment/...

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2 days ago
Post by Aaron Rupar summarizing an NBC interview in which a reporter presses a Trump administration official about easing oil sanctions benefiting Russia, with a split-screen image of the journalist and the official during the interview.

Trump never met a favor he couldn't do for his pal Vladimir.

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3 days ago
Netflix promo poster for The Dinosaurus, showing Spinosaurus jaws in shallow water with a shark swimming toward them.

Last night I watched all 4 eps of the new Netflix series The Dinosaurs. I tend not to comment on these kinds of shows as, having worked on them, I find that those people who criticize or critique them have no understanding of the competing pressures and factors inherent to the TV industry... 1/8

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2 days ago

To the contrary, the framers of the American constitution were *deeply* concerned about a Trump. They believed - it turns out incorrectly - that the system of checks and balances, the other institutions, would prevent a despotic president.

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2 days ago
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Inter‐ and intraspecific variation in theropod dinosaur dental microwear and its palaeoecological implications Differences in skull and tooth morphology, stomach contents, and estimated bite force between medium-to-large sized (≥100 kg) predatory theropod dinosaurs have long been suspected to correlate with d...

Inter‐ and intraspecific variation in theropod dinosaur dental microwear and its palaeoecological implications - Morrison - The Anatomical Record - Wiley Online Library anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...

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2 days ago
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Unraveling the identity of Plesiosaurus posidoniae, the first plesiosaur described from the Posidonia Shale of Germany Schematic representation of the stratigraphic distribution of nearly complete plesiosaur specimens within the lower Toarcian (upper Lower Jurassic) Lias ɛII interval of the Posidonia Shale (Posidonie...

Unraveling the identity of Plesiosaurus posidoniae, the first plesiosaur described from the Posidonia Shale of Germany - Sachs - The Anatomical Record - Wiley Online Library anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...

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2 days ago
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Osteology and relationships of a new shuvosaurid (Pseudosuchia, Poposauroidea) from the Upper Triassic Chinle Formation of Petrified Forest National Park, Arizona, U.S.A. Shuvosauridae is a clade of pseudosuchian archosaurs currently represented by three named species characterized by a body plan strikingly convergent with that of ornithomimid theropod dinosaurs. Th...

Full article: Osteology and relationships of a new shuvosaurid (Pseudosuchia, Poposauroidea) from the Upper Triassic Chinle Formation of Petrified Forest National Park, Arizona, U.S.A. www.tandfonline.com/doi/full/10....

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3 days ago
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Osteology and relationships of a new shuvosaurid (Pseudosuchia, Poposauroidea) from the Upper Triassic Chinle Formation of Petrified Forest National Park, Arizona, U.S.A. Shuvosauridae is a clade of pseudosuchian archosaurs currently represented by three named species characterized by a body plan strikingly convergent with that of ornithomimid theropod dinosaurs. Th...

the #openaccess paper can be found here!
www.tandfonline.com/doi/full/10....

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3 days ago

The DOJ released evidence, which the FBI deemed credible, that the President of the United States sexually and physically assaulted a 13 year old girl AND she was afraid to talk about it because Trump would kill her—and it’s somehow not the biggest scandal in American history?

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3 days ago
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In first, CIA acknowledges 1953 coup it backed to overthrow leader of Iran was undemocratic While other American officials have made similar remarks in the past, the acknowledgment by the CIA in a podcast about the agency’s history comes as much of its official history of the coup still rema...

I wonder what percentage of Americans knows that the CIA helped overthrow a democracy in Iran in 1953, installing a brutal dictator who tortured and murdered people. Republicans keep citing the 1979 Islamic Revolution as if that was the start of U.S.-Iran hostilities. Go back 26 years earlier.

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3 days ago

They’re dumb thugs flexing with LLMs instead of muscles. Absolute losers.

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2 days ago
Screenshot of a post by Acyn quoting Pete Buttigieg criticizing Trump, saying money from the Middle East is going into the Trump family’s crypto fund while Americans are being sent to the Middle East for Trump’s war. A video frame shows Buttigieg speaking.

Pete Buttigieg nails it.

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3 days ago
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Hatred, ignorance, fear, greed, and discrimination are viruses, magnified by suffering, carried in buckets, spilled onto the world.

We cannot eliminate them by actions that magnify hatred, ignorance, fear, greed, discrimination and suffering - only by actions that relieve them.

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2 days ago

Not to mention decarbonisation would mean a third of all heavily polluting ships just... don't need to be there

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2 days ago

Sweet and lovely. and a reminder that so much of Japan's best-loved, most socially embedded anime makes little impact on English-speaking fans.

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5 days ago
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Late Glacial to Early Holocene Vegetation Reconstruction from the Wenas Creek Mammoth Site in Washington State The Wenas Creek Mammoth site pollen record, which extends from ∼20,000–10,000 cal yr BP, is significant given that few eastern Cascade paleoecological records span the Late Glacial to Early Holocen...

Happy #FossilFriday here is a wee climate paper that I coauthored. We found that 20kya eastern Washington was drying and warming up and chasing away all the pesky pine trees (ew, trees).

As usual with pleistocene stuff, my job was figuring out how old all the dirt was (age-depth modelling)

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4 days ago
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#PaleoFest2026 #PaleoFest talks are starting soon. Don't forget to axolotl questions!

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4 days ago
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Bazookasaurus

xkcd.com/3216/

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5 days ago
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This bears repeating.

Dr. Casey Means is not eligible for the position as Surgeon General. The position requires experience in public health programs & entry into regular corps. She has done neither.

You can take action by sending a letter to your senator.

🧪 actionnetwork.org/letters/oppo...

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5 days ago
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An Army Corps project could wipe out one of Florida’s last thriving coral reefs The fate of one of the last thriving coral reefs in Florida may be imperiled by plans to widen the shipping channel leading into Port Everglades.

The US army corps of engineers is considering, right now, what would be the largest destruction of coral reefs in US history. To make a port slightly bigger.

People know this, right?

www.washingtonpost.com/climate-envi...

🧪🦑🌎

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