recentpopularlog in


« earlier   
Trilobite Fossils Show Conga Line Frozen for 480 Million Years - The New York Times
The orderly collection of ancient arthropods suggests that complex social behavior goes way back in the history of life on Earth.
3 days ago by casfindad
*** PETM - The Last Time the Globe Warmed - YouTube
Comparing today to the PETM - Paleocene-Eocene Thermal Maximum, end of Paleocene Epoch about 56 Mya as the global was still recovering from the end of the dinosaurs (66mya).
global_warming  climate_change  videos  grade_A  grade_AA  grade_AAA  paleontology  Hank_Green  PBS 
29 days ago by Marcellus
RT : In case you have not visited recently, it has introduced bilingual signage to its ex…
paleontology  from twitter_favs
7 weeks ago by xbryanx
Ornithoscelida Rises: A New Family Tree for Dinosaurs - Scientific American Blog Network
Some of the best discussion of the Baron et al cladogram/reorganization I've seen.

"The proposed monophyly of Ornithoscelida also makes something else even weirder than it was before, and this is the lack of skeletal pneumaticity in ornithischians. Models where Saurischia of tradition is monophyletic make it seem reasonable to think that dinosaurs were apneumatic ancestrally, and that skeletal pneumaticity then evolved as a novelty in the sauropodomorph-theropod common ancestor (though this is a gross simplification for reasons I don’t have time to go into here).

"But with ornithischians sandwiched between these two pneumatic lineages (Baron et al. 2017)… ugh. Did skeletal pneumaticity evolve independently in the sauropodomorph and theropod lineages, was skeletal pneumaticity ancestrally widespread and then lost in ornithischians, or are there pneumatic ornithischians out there that we’ve missed, in part due to our expectation that they weren’t pneumatic?"
dinosaurs  paleontology  ornithischian  saurischian  ornithoscelidae  classification 
8 weeks ago by Felicity

Copy this bookmark:

to read