Dinosaurs once thrived near the Arctic

MOST Artistic The impression of dinosaurs depicts them in lush forests and vast temperate savanna. It’s fair enough. Such landscapes were common during the heyday of the beast, the Jurassic, and the Cretaceous. However, these photographs ignore the fact that dinosaur fossils have been dug in places of polarity at the time for decades. It is debated whether these are the remains of immigrants who arrived in the summer or the remains of permanent residents. However, the discovery of bone fragments and teeth in a dinosaur’s freshly hatched turtle (see photo) Current biology Patrick Druckenmiller and his colleagues at the University of Alaska Fairbanks suggest that some dinosaurs actually built full-time homes in the Arctic.

Modern animals, especially birds, that move to polar climates often breed there. However, their eggs hatch quickly and their young people grow fast enough to fledge and fly to warmer areas before winter comes. Growth lines of fossilized dinosaur embryos found elsewhere suggest that it takes 6 to 7 months to incubate before they are ready to hatch. Therefore, paleontologists believe that if fossilized eggs or freshly hatched turtles were found near the paleontologist, the species involved must have lived all year round, not immigrants.

To date, no such freshly hatched turtle has been found, and the only known polar dinosaur egg was from the Kakanaut Formation in northeastern Russia. Drakken Miller’s discovery comes from the Prince Creek Formation in northern Alaska. This layer may have been near 5 degrees latitude from the North Pole when the rock was formed 70 meters ago.

The fossil itself comes from various dinosaur groups, including the Ceratopsian family ( Triceratops), Hadrosaurus in the beak of a duck, a large carnivore associated with Tyrannosaurus A predator like a small Velociraptor. This suggests a diverse and prosperous ecosystem, despite the fact that Prince Creek was continuously dark for 120 days a year and the average annual temperature was 6 ° C. In other words, snow was common in winter.

Drakken Miller suggests that how all these creatures survived these conditions was the result of the warm-blooded and fluffy wings of the dinosaurs. No direct evidence of feathers has yet been found in Alaskan fossils, but they may have been due to their ubiquity elsewhere.

This article was published in the printed version of the Science and Technology section under the heading “Arctic Dinosaurs”.

Dinosaurs once thrived near the Arctic

Source link Dinosaurs once thrived near the Arctic

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