That's the first time a person had set foot on top of the sea stack since 1990, when a group of climbers summited the stack, the Daily Express reported.īefore that, a team of scientists helicoptered to the top of Dún Briste in the 1980s. In 2016, daredevil Iain Miller climbed the cliff, according to the Daily Express, a news outlet in the United Kingdom. This may explain why it was named Dún Briste, which is Gaelic for "broken fort," according to the website. In 1393, an arch leading to the 150-foot-tall (45 meters) sea stack collapsed during a storm, according to. "As the land surface was flooded, sediments were laid down progressively inland," McNamara said. This indicates there was a rise in sea level long ago, she said. Looking at the sea stack's layers and edges, McNamara noticed that the structure shows evidence of onlapping strata, or layers. When it formed, Dún Briste was still connected to the mainland. But if it does, they would likely be the remains of creatures that lived during that time period, including corals, brachiopods (clam-like creatures) and crinoids (sea animals that look like flowers), McNamara said. It's unclear whether Dún Briste has any fossils from the Carboniferous period. (In other words, the sea stack formed millions of years ago, but it formed very quickly.) That's long before dinosaurs roamed the Earth. The layered, sedimentary rock formed during the Carboniferous, a 60-million-year-long period lasting from about 359 million to 299 million years ago. The view of the sea stack from Ireland's County Mayo is stunning, which may explain why the picture has received about 57,300 up-votes on Reddit since its posting on Feb. Its rapid formation (geologically speaking, at least) doesn't make this structure any less marvelous. "Rather, tens to hundreds of thousands of years," she said. The sea stack is old, but "almost certainly doesn't represent millions of years" of geological processes, Maria McNamara, a paleobiologist at the University College Cork, in Ireland, told Live Science in an email. But the post's captivating title - "What millions of years look like in one photo" - isn't exactly accurate, a geologist told Live Science. A photo of Dún Briste - a layered, chunky tower of rock rising off the western coast of Ireland -skyrocketed to the top of Reddit last week.
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