Scottish Island Shows Evidence of Dinosaur Parade Ground
2020-03-19
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1On Scotland's Isle of Skye, scientists have identified two areas with evidence of ancient life forms.
2Researchers believe the markings are, in fact, footprints from dinosaurs that lived 170 million years ago.
3They say the prints date to the middle of the Jurassic Period, a time from which few dinosaur fossils have been recovered.
4Researchers reported this month on their study of about 50 fossilized footprints at the two sites.
5The markings are just a few hundred meters apart from each other.
6They are said to show dinosaurs walking in different directions.
7At least three kinds of dinosaurs left the footprints.
8Steve Brusatte, the leader of the research team, is a paleontologist with the University of Edinburgh.
9"The tracks are located on flat rocky surfaces near the beach, so they are only exposed at low tide," he said.
10"The tide laps across them, back and forth, every day."
11One set of markings came from a two-legged, meat-eating dinosaur that researchers say was about the size of a car.
12They say its footprints have three toes.
13The creature, with sharp claws, appears to be from a group of dinosaurs called theropods.
14Bigger, three-toed footprints came from large-bodied, two-legged plant-eaters called ornithopods or perhaps, the researchers say, a large theropod.
15All of these prints had worn-down toes, not sharp edges.
16The researchers are especially interested in markings left by another creature: an early member of a group of heavily built, four-legged plant-eaters called stegosaurs.
17The footprints represent some of the oldest evidence anywhere of a stegosaur, notes Paige dePolo, a doctoral student at the University of Edinburgh.
18DePolo was the lead writer of a report on the study.
19The findings were published in the journal PLOS ONE.
20The most famous member of the stegosaurs was Stegosaurus, which lived late in the Jurassic Period.
21It had large, bony protective plates around the neck and back - and a large spiked tail, too.
22Brusatte was careful to note that the researchers still have a lot of unanswered questions about this creature.
23"I suspect this stegosaur was about the size of a cow, which is fairly small for a stegosaur. Whether that's because it's a primitive, smaller species or a juvenile of a bigger species, we're not sure," he said.
24The researchers noted that the findings were an important window into the many kinds of dinosaurs on the Isle of Skye.
25"Skye has emerged as one of the most important windows into Jurassic dinosaur evolution.
26We know that dinosaurs were diversifying with a frenzy in the Middle Jurassic,
27but there are few fossil sites of this age anywhere in the world," Brusatte added.
28I'm John Russell.
1On Scotland's Isle of Skye, scientists have identified two areas with evidence of ancient life forms. 2Researchers believe the markings are, in fact, footprints from dinosaurs that lived 170 million years ago. They say the prints date to the middle of the Jurassic Period, a time from which few dinosaur fossils have been recovered. 3Researchers reported this month on their study of about 50 fossilized footprints at the two sites. The markings are just a few hundred meters apart from each other. They are said to show dinosaurs walking in different directions. 4At least three kinds of dinosaurs left the footprints. 5Steve Brusatte, the leader of the research team, is a paleontologist with the University of Edinburgh. 6"The tracks are located on flat rocky surfaces near the beach, so they are only exposed at low tide," he said. "The tide laps across them, back and forth, every day." 7One set of markings came from a two-legged, meat-eating dinosaur that researchers say was about the size of a car. They say its footprints have three toes. The creature, with sharp claws, appears to be from a group of dinosaurs called theropods. 8Bigger, three-toed footprints came from large-bodied, two-legged plant-eaters called ornithopods or perhaps, the researchers say, a large theropod. All of these prints had worn-down toes, not sharp edges. 9The researchers are especially interested in markings left by another creature: an early member of a group of heavily built, four-legged plant-eaters called stegosaurs. 10The footprints represent some of the oldest evidence anywhere of a stegosaur, notes Paige dePolo, a doctoral student at the University of Edinburgh. 11DePolo was the lead writer of a report on the study. The findings were published in the journal PLOS ONE. 12The most famous member of the stegosaurs was Stegosaurus, which lived late in the Jurassic Period. It had large, bony protective plates around the neck and back - and a large spiked tail, too. 13Brusatte was careful to note that the researchers still have a lot of unanswered questions about this creature. 14"I suspect this stegosaur was about the size of a cow, which is fairly small for a stegosaur. Whether that's because it's a primitive, smaller species or a juvenile of a bigger species, we're not sure," he said. 15The researchers noted that the findings were an important window into the many kinds of dinosaurs on the Isle of Skye. 16"Skye has emerged as one of the most important windows into Jurassic dinosaur evolution. We know that dinosaurs were diversifying with a frenzy in the Middle Jurassic, but there are few fossil sites of this age anywhere in the world," Brusatte added. 17I'm John Russell. 18Will Dunham reported on this story for Reuters. John Russell adapted the report for VOA Learning English. George Grow was the editor. 19____________________________________________________ 20Words in This Story 21fossil - n. the remains of an ancient organism 22paleontologist - n. the science that deals with the fossils of animals and plants that lived very long ago especially in the time of dinosaurs 23track - n. markings; something showing evidence of movement 24beach - n. a sandy or stone-filled area, usually between the ocean and land 25expose - v. to leave (something) without covering or protection 26lap - v. washing against something with a gentle sound 27toe - n. any of five extensions at the end of the human foot 28claw - n. a curved, pointy hard surface on each finger or toe in birds and some animals 29spiked - adj. having sharp points : formed into points 30evolution - n. the process by which changes in plants and animals happen over time 31frenzy - n. a period of wild behavior 32We want to hear from you. Write to us in the Comments Section.