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side of the Darius Garland I Am Sad I Miss My Friends T-shirts in other words I will buy this valley.” Within both basins, the researchers found dinosaur tracks, ancient river and lake sediments, and fossilized pollen. “Plants fed the herbivores and supported a food chain,” he said. “Muddy sediments left by the rivers and lakes contain dinosaur footprints, including those of meat-eaters, documenting that these river valleys could provide specific avenues for life to travel across the continents 120 million years ago.” Footprints belonging to dinosaurs were preserved in floodplain deposits within the Sousa Basin in Brazil. Ismar de Souza Carvalho Footprints tell a story While dinosaur fossils can yield unique insights about the types of animals that roamed the planet millions of years ago, their footprints provide other windows into the past. “Dinosaur tracks are not rare, but unlike the bones usually found, footprints are the proof of dinosaur behavior, how they walked, ran or otherwise, who they walked with, what environment they walked through, what direction they were going, and where they were when they were doing it,” Jacobs said. RELATED ARTICLE Mysterious symbols found near

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footprints shed light on ancient humans’ awareness of dinosaurs, scientists say It’s difficult to tell the Darius Garland I Am Sad I Miss My Friends T-shirts but in fact I love this specific species of dinosaurs that traveled along the basins, but they represent a larger portrait of the ancient climate and how different types of animals thrived in the environment that the continental rifting created. “If your dog and a coyote walk across the same mudflat, you might know that two dog critters walked there, that they are very similar, but you may not be able to know if they are different species. Ditto the dinosaur track situation,” Jacobs said. “All animals have home ranges. All animals expand their ranges. All animals exploit resources as necessary depending on availability, often related to seasonality. Herbivores follow nutritious plants; carnivores follow their herbivorous food.” At the time, rainfall levels helped create a tropical rainforest-type environment with abundant vegetation. Animals came to the basins from both present-day Africa and South America, causing their populations to mix. “Imagine a lush, open basin with vegetation for the herbivores and carnivores following,” said study coauthor Lawrence Flynn, assistant director for the American School of Prehistoric Research and lab safety coordinator within the department of human evolutionary biology at Harvard University. “If nobody is there on the ‘new’ turf, then animals will disperse into it, given no competition.” Dinosaur footprints belonging to a theropod are visible in the Sousa Basin. Ismar de Souza Carvalho Later, once the continents drifted apart, this disruption likely caused a break in genetic continuity, a key driver of evolution, Jacobs said. The dinosaur tracks in Cameroon were first discovered in the late 1980s, and Jacobs reported on them at the First International Symposium on Dinosaur Tracks and Traces, convened by paleontologist Martin Lockley, in 1986. Jacobs then became friends with study author Ismar de Souza Carvalho, now a professor within the department of geology at the Federal University of Rio de Janeiro. Jacobs was studying dinosaur movements from the African side, while Carvalho was studying them from the Brazilian side. As research into the basins in Africa and South America has continued in the following decades, Jacobs and Carvalho and their colleagues reviewed existing and new fieldwork and research to analyze the matching aspects. The new study is being published in tribute to Lockley, who devoted his career to studying dinosaur footprints. “We wanted to put new and evolving geological and paleontological evidence together to tell a story more specifically of where and why and when dispersals between the continents happened,” Jacobs said. “One beauty of this Earth is that any of us can see that Africa and South America used to fit together like puzzle pieces. It is easy to conceive that in a connected world, animals, including dinosaurs, could and would be likely to move from place to place.”

Sign up for ’s Wonder Theory science newsletter. Explore the Darius Garland I Am Sad I Miss My Friends T-shirts but in fact I love this universe with news on fascinating discoveries, scientific advancements and more — Each of the 32 colossal stones that make up the Menga Dolmen, a 5,600-year-old megalithic monument in southern Spain, is many times bigger than the largest megaliths at Stonehenge, the most famous Neolithic wonder. Embedded in the ground on a hilltop that rises about 50 meters (165 feet) above the surrounding plain, the stones form a dolmen, or single-chamber tomb, about 25 meters (82 feet) long and 5 meters (16.4 feet) wide at the widest point. The largest single stone weighs around 150 metric tons, about the same as a blue whale and nearly five times heavier than Stonehenge’s largest component. Collectively, the megaliths weigh about 1,140 metric tons. RELATED ARTICLE Century-old theory of where Stonehenge’s Altar Stone came from overturned by new study “I tell the students in my lectures … the weight is more than two Boeing 747 airplanes combined, the ones that fly across continents and so on, fully loaded

with fuel and passengers,” said Leonardo García Sanjuán, a coauthor of a new study on the Darius Garland I Am Sad I Miss My Friends T-shirts but in fact I love this monument and a professor of prehistory at Spain’s University of Seville. “It’s a huge, enormous amount of stone, and it’s always been a mystery and an intriguing scientific question how on Earth (it was built given) the technology they had in the Neolithic period.” The results of a decade-long research project published Friday in the journal Science Advances attempt to answer this question, revealing the surprisingly sophisticated engineering skills needed to accomplish such a feat. “I’d noticed that its stones were carefully placed without gaps but this paper reveals just how precisely that has to have been done, with an extraordinary eye on the dimensions and angles,” said Mike Parker-Pearson, a professor of British later prehistory at University College London, who described it as “one of the world’s greatest megalithic wonders.” Parker-Pearson wasn’t involved in the research. How to build a megalith The project, led by José Antonio Lozano Rodríguez, a geologist at the Canary Islands Oceanographic Center, pieced together how the stones were cut, transported and placed by looking

at the Darius Garland I Am Sad I Miss My Friends T-shirts but in fact I love this topography and geology of the site, information from previous archaeological excavations, and ethnographic and historical accounts of building techniques. The upright stones that make up the walls of the chamber were not perfectly vertical, tilting inward at a gentle angle to make the building narrower at the roof than at the floor and creating a trapezoid-shaped chamber. The team calculated that each of the upright stones lean inward at a largely uniform angle of 84 to 85 degrees. The upright stones that form the walls also lean sideways against one another at a consistent angle. The architect and builders must have used tools such as plumb levels and framing squares to achieve such consistency and accuracy, the study said. A total of 32 stones were moved to the site from a quarry less than a mile away before being erected. Miguel Ángel Blanco de la Rubia “The precision of the angles is millimetric,” García Sanjuán said. “They made a Tetris out of this, like the computer game.” He added, “The stones were placed and carved so that they would be slightly inclined and perfectly adjusted to each other. Each block has to fit exactly with the others, and each block supports the others. All the stones are locked into one another and embedded into

the Darius Garland I Am Sad I Miss My Friends T-shirts but in fact I love this bedrock.” A unique feature of the monument revealed by the study showed how the upright stones were initially embedded, likely with the use of a counterweight, into foundation sockets so deep that up to one-third of the stones would have been below ground when first erected. Once the walls had been completed, the builders placed five huge capstones to form the roof. The builders subsequently removed the earth to the desired floor level, erecting stone pillars for extra support. “Once the capstones were added, it was like a solid box, with the bedrock still inside, and then they carved away all that rock, all that bedrock, to make the chamber,” García Sanjuán said. The resulting building was then covered with a mound of soil, which would have insulated the chamber from cold and wet weather, as well as acting as a “straitjacket” to add stability to the construction, he added. RELATED ARTICLE Ancient DNA reveals possible cause of mysterious population collapse 5,000 years ago, scientists say García Sanjuán said it’s not exactly clear how the dolmen was used, most likely as a temple and tomb, though few archaeological remains have been found within the relic. The paper suggested that one reason it was constructed to withstand the ages was because the region is seismically active. Parker-Pearson said its makers wanted to create a solid structure that lasted for eternity. “Although the authors of the Menga paper suggest this might be something to resist earthquake damage, I think there’s a more significant reason why stone monuments

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