Kirk Johnson

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Kirk Johnson

Kirk Johnson

@leafdoctor

Smithsonian @NMNH director & paleobotanist. Works with artists to visualize extinct landscapes. [Pers/Prof account, opinions my own]

Washington, DC Katılım Eylül 2010
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Peter Wilf
Peter Wilf@RadioGondwana·
Just a reminder that the 2009 Leaf Manual is available open access ! Use it and enjoy the leaves. 🍃🌿🍂 repository.si.edu/handle/10088/9…
Peter Wilf@RadioGondwana

NEW Now available open access. Manual of Leaf Architecture. By Beth Ellis, Douglas C. Daly, Leo J. Hickey, Kirk R. Johnson, John D. Mitchell, Peter Wilf, Scott L. Wing. Cornell University Press and New York Botanical Garden Press (2009). OA agreement & pdf link below in replies.

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Quite Interesting
Quite Interesting@qikipedia·
This is what happens when a walrus falls asleep on a surfacing submarine...
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Massimo
Massimo@Rainmaker1973·
North America about 77 millions years ago
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Nature
Nature@PBSNature·
Thanks for watching The Platypus Guardian tonight! What was the highlight of the episode for you? #NaturePBS
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USGS
USGS@USGS·
Big news: USGS scientists & partners have confirmed, with 2 new lines of evidence, that human footprints found in White Sands Nat'l Park show that people lived in North America 21-23,000 yrs ago—much earlier than previously thought! More here: ow.ly/9peJ50PTBGN Imgs: NPS
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Scott D. Sampson
Scott D. Sampson@DrScottSampson·
Ever wondered what it's like to go inside the vast collection of a natural history museum, or why we keep such vast natural treasures? Well, wonder no more. This terrific, interactive piece by @peterhartlaub explores the collections of @calacademy. Enjoy! sfchronicle.com/projects/2023/…
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Dr. Karly E. Cohen
Dr. Karly E. Cohen@Karly_Cohen·
Another surprise visitor to the San Juan islands today! A giant oarfish washed up on Friday Harbor in near perfect condition. Check out those jaws!!
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Ameghiniana - a gondwanan paleontological journal
Ameghiniana - a gondwanan paleontological journal@ameghiniana·
AMEGH 60(6) presents the obituary of Dr. Sergio Archangelsky. Born in Morocco on March 27, 1931. The family moved to Argentina, where Sergio studied Geology at the @UBAonline His final dissertation topic was Paleobotany, and that was the beginning of his brilliant career.
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Buitengebieden
Buitengebieden@buitengebieden·
The defense mechanism of an armadillo..
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Smithsonian NMNH
Smithsonian NMNH@NMNH·
#TBT to May of 1909 and the installation of the last stone on the south porch of the museum. 🏛️ A few short months later staff began to occupy the building and move the then 10 million item collections by horse-drawn cart. Credit: @SILibraries, Record Unit 95, Box 33, Folder 4
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Scott Duncan
Scott Duncan@ScottDuncanWX·
Craziest thing you will see today... Stunning upwards lightning above Acatenango Volcano in Guatemala 🇬🇹
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Smithsonian NMNH
Smithsonian NMNH@NMNH·
This slab of fossilized crinoid specimens date from 345-280 million years ago and was collected in Indiana. Displaying the wide variety of shapes and sizes found in this class of extinct echinoderms, this specimen includes 15 different species. Catalog number USNM S 7342
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Keşfet

@PalaeoJules @peterhartlaub @calacademy @UBAonline @joshforwood @DiscoverMag @DrJamesEHansen @MichaelEMann