Tag

Growth Rings

All articles tagged with #growth rings

science22 days ago•8 min saved

T. rex grew to adulthood over four decades, new study finds

A large study of 17 tyrannosaur fossils using expanded histology and advanced statistics finds Tyrannosaurus rex reached its adult mass of about eight tons after roughly 40 years, slower and more variable than previously thought. The work uncovers previously overlooked growth rings, suggests a longer subadult phase, and raises questions about whether some specimens (including Jane and Petey) belong to a separate Nanotyrannus-like species, reshaping debates about tyrannosaur growth and diversity.

via SciTechDaily|

#growth-modeling #growth-rings #nanotyrannus

science1 month ago•6 min saved

T. rex Rewrites Its Growth Timeline: Adulthood Arrives at 35–40

A peer‑reviewed study analyzing growth rings in 17 T. rex leg bones shows full adult size was reached around ages 35–40, with rapid growth from 14 to 29 and extended growth for at least a decade afterward, implying a longer subadult phase and prompting renewed questions about species boundaries within fossils labeled T. rex.

via Indian Defence Review|

#growth-rings #maturation #paleontology

science1 month ago•2 min saved

T. rex grew into a giant over four decades, new study finds

A new peer-reviewed study of 17 Tyrannosaurus rex fossils used growth rings revealed by polarized light to map year-by-year growth, showing T. rex took 35–40 years to reach full size and grew for four decades to about 8 tons, with an estimated lifespan of 45–50 years. This large dataset yields a revised growth curve and suggests a lengthy juvenile phase may have helped juveniles occupy varied ecological roles before the species became a dominant late-Cretaceous apex predator.

via Gizmodo|

#cretaceous-period #growth-rate #growth-rings

science1 month ago•312 min saved

New study revises T. rex growth timeline, reached full size by 35–40 years

A study of 17 Tyrannosaurus rex fossils using polarized light reveals growth rings showing they grew slowly, not reaching a maximum size of about 8 tons until about 35–40 years old. Growth rings capture only the last 10–20 years of life, but by combining data across ages researchers reconstructed year-by-year growth, finding more variability and suggesting possible taxonomic differences such as Nanotyrannus; the findings revise the dinosaur’s growth timeline and how it occupied various ecological niches.

via CNN|

#dinosaur-growth #growth-rings #nanotyrannus

paleontology2 years ago•4 min saved

"Dinosaur Lifespan: Unraveling the Mystery of Extinct Giants"

The lifespan of dinosaurs varied depending on their size, with larger dinosaurs living longer than smaller ones. By studying growth rings in bones, scientists can estimate the age of dinosaurs. It is believed that very large sauropod dinosaurs took about 30 to 35 years to reach maximum size and may have lived for an additional 30 to 50 years. Smaller dinosaurs, such as ornithopods, reached their full size at around four to five years and likely had shorter lifespans. Contrary to previous assumptions, dinosaurs grew rapidly and did not live as long as previously thought.

via IFLScience|

#dinosaurs #extinct-animals #fossil-vertebrates