Andrew J. Steinmetz<p>To clarify for someone who asked: 44 <a class="hashtag" href="https://bsky.app/search?q=%23Tyrannosaur" rel="nofollow noopener" target="_blank">#Tyrannosaur</a> rexes have been found at Hell Creek (24% of all finds) so the total Hell Creek T-Rex population was ~0.7 million during a 2 million year period. <a class="hashtag" href="https://bsky.app/search?q=%23Dinosaurs" rel="nofollow noopener" target="_blank">#Dinosaurs</a> <a class="hashtag" href="https://bsky.app/search?q=%23Science" rel="nofollow noopener" target="_blank">#Science</a> <a class="hashtag" href="https://bsky.app/search?q=%23PaleoSky" rel="nofollow noopener" target="_blank">#PaleoSky</a> 🧪🦖<br><br>RE: <a href="https://bsky.app/profile/did:plc:xd6msyxiymq4ldfllpeusl6h/post/3lm54hlhfus2s" rel="nofollow noopener" target="_blank">https://bsky.app/profile/did:plc:xd6msyxiymq4ldfllpeusl6h/post/3lm54hlhfus2s</a></p>
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Andrew J. Steinmetz<p>Most metal <a class="hashtag" href="https://bsky.app/search?q=%23Dinosaur" rel="nofollow noopener" target="_blank">#Dinosaur</a> fact: It's estimated that we have recovered about one in 16,000 of the <a class="hashtag" href="https://bsky.app/search?q=%23Tyrannosaurus" rel="nofollow noopener" target="_blank">#Tyrannosaurus</a> rexes that lived in Hell Creek Formation in Montana during that period of rock formation. Not a bad average! 🧪 🦖 <a class="hashtag" href="https://bsky.app/search?q=%23Science" rel="nofollow noopener" target="_blank">#Science</a> <a class="hashtag" href="https://bsky.app/search?q=%23PaleoSky" rel="nofollow noopener" target="_blank">#PaleoSky</a> <a class="hashtag" href="https://bsky.app/search?q=%23Fossils" rel="nofollow noopener" target="_blank">#Fossils</a> See: <a href="https://doi.org/10.1126/science.abc8300" rel="nofollow noopener" target="_blank">doi.org/10.1126/scie...</a><br><br><a href="https://doi.org/10.1126/science.abc8300" rel="nofollow noopener" target="_blank">Absolute abundance and preserv...</a></p>
Andrew J. Steinmetz<p>The diet of <a class="hashtag" href="https://bsky.app/search?q=%23TyrannosaurusRex" rel="nofollow noopener" target="_blank">#TyrannosaurusRex</a> consisted of Hadrosaurs, Triceratops, and other large <a class="hashtag" href="https://bsky.app/search?q=%23dinosaurs" rel="nofollow noopener" target="_blank">#dinosaurs</a>. Surprisingly though this also included other Tyrannosaurus rexes indicating cannibalism! See the bite marks in these <a class="hashtag" href="https://bsky.app/search?q=%23Fossils" rel="nofollow noopener" target="_blank">#Fossils</a>. 🧪🦖 <a class="hashtag" href="https://bsky.app/search?q=%23Science" rel="nofollow noopener" target="_blank">#Science</a> <a class="hashtag" href="https://bsky.app/search?q=%23PaleoSky" rel="nofollow noopener" target="_blank">#PaleoSky</a> Source: <a href="https://doi.org/10.1371/journal.pone.0013419" rel="nofollow noopener" target="_blank">doi.org/10.1371/jour...</a></p>
Andrew J. Steinmetz<p>Carnivorous coprolites (fossil poop) of <a class="hashtag" href="https://bsky.app/search?q=%23Dinosaurs" rel="nofollow noopener" target="_blank">#Dinosaurs</a> are rare. This one, likely <a class="hashtag" href="https://bsky.app/search?q=%23Tyrannosaurus" rel="nofollow noopener" target="_blank">#Tyrannosaurus</a> rex, is 30-50% bone fragments giving insight into theropod diet & digestion. <a class="hashtag" href="https://bsky.app/search?q=%23Science" rel="nofollow noopener" target="_blank">#Science</a> <a class="hashtag" href="https://bsky.app/search?q=%23PaleoSky" rel="nofollow noopener" target="_blank">#PaleoSky</a> 🧪🦖 The title is hilarious: A king-sized theropod coprolite. Chin, Karen et. al. Nature. <a href="https://doi.org/10.1038/31461" rel="nofollow noopener" target="_blank">doi.org/10.1038/31461</a></p>
Andrew J. Steinmetz<p>Check out the Suncor nodosaur discovered in Alberta, CA. This 100-million-year-old ankylosaur is among the best preserved dinosaurs ever discovered with keratin armor, skin pigment, tissue, and stomach contents. <a class="hashtag" href="https://bsky.app/search?q=%23Science" rel="nofollow noopener" target="_blank">#Science</a> <a class="hashtag" href="https://bsky.app/search?q=%23PaleoSky" rel="nofollow noopener" target="_blank">#PaleoSky</a> <a class="hashtag" href="https://bsky.app/search?q=%23Dinosaurs" rel="nofollow noopener" target="_blank">#Dinosaurs</a> <a class="hashtag" href="https://bsky.app/search?q=%23Fossils" rel="nofollow noopener" target="_blank">#Fossils</a> 🧪 Source: <a href="https://commons.wikimedia.org/wiki/File:Nodosaur.jng" rel="nofollow noopener" target="_blank">commons.wikimedia.org/wiki/File:No...</a></p>
Andrew J. Steinmetz<p>Gravity anomaly map of the Chicxulub crater in the Yucatán responsible for the Cretaceous-Paleogene extinction event. Of the dinosaurs, only the avians (birds) survived this time period. The white dots are sinkhole locations which trace the crater's rim. <a class="hashtag" href="https://bsky.app/search?q=%23Science" rel="nofollow noopener" target="_blank">#Science</a> <a class="hashtag" href="https://bsky.app/search?q=%23Geology" rel="nofollow noopener" target="_blank">#Geology</a> <a class="hashtag" href="https://bsky.app/search?q=%23PaleoSky" rel="nofollow noopener" target="_blank">#PaleoSky</a> <a class="hashtag" href="https://bsky.app/search?q=%23Dinosaurs" rel="nofollow noopener" target="_blank">#Dinosaurs</a> 🧪🦕🦖</p>
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