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Large amounts of the greenhouse gas methane are locked up as solid gas hydrates in the continental slopes of ocean margins.Their stability depends on low temperatures and high pressure. Researchers have confirmed that a giant lava dome was created in the Kikai Caldera, south of Japan's main islands after the caldera-forming supereruption 7,300 years ago.
The diverse origins of archeology account for its continuing dual orientation—some archeologists working most closely with natural and social scientists and Radiocarbon dating is a method that provides objective age estimates for carbon-based materials that originated from living organisms. Using the largest set of radiocarbon dates ever obtained from a single Maya site, a team of archaeologists have developed a high-precision chronology that sheds new light on patterns leading up to ...While the giant birds that once dominated New Zealand are all extinct, a study of their preserved dung (coprolites) has revealed many aspects of their ancient ecosystem, with important insights for ...In contrast to relative dating techniques whereby artifacts were simply designated as "older" or "younger" than other cultural remains based on the presence of fossils or stratigraphic position, 14C dating provided an easy and increasingly accessible way for archaeologists to construct chronologies of human behavior and examine temporal changes through time at a finer scale than what had previously been possible.The application of Accelerator Mass Spectrometry (AMS) for radiocarbon dating in the late 1970s was also a major achievement.