Sentences with phrase «ancient shorelines»
The phrase "ancient shorelines" refers to the old levels of land where the ocean or a large body of water used to meet the land long ago. Full definition
Pockets of gas trapped along ancient shorelines would have given them a cozy place to call home about 3.2 billion years ago.
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Figuring out how far sea level rose during past warm periods in Earth's history starts with a walk on the beach, a keen eye for evidence of ancient shorelines, and a highly accurate GPS system.
These may be submerged ancient shorelines cut during times of lower sea level, «the most recent of which occurred during the last glacial period, which ended about 19,000 years ago,» Chaytor said.
His team discovered ancient shorelines and 1,200 - year - old wood fragments in lake sediments dating to around the time Rimpoche arrived in Tibet.
However, they acknowledge, a true test requires on - site studies, because it's often difficult to detect ancient shorelines even in satellite images of Earth.
Containing three footprints, the new trackway was found in 66 - million - year - old rocks that formed along an ancient shoreline in what is now Wyoming.
With the new reconstruction, paleontologists can now analyze the trackways and better determine things such as the sizes, motions, and walking speeds of the dinosaurs that left the footprints — which, in turn, may reveal whether an ancient predator really «chased» its prey along an ancient shoreline or merely ambled by at about the same time.
People disembarking from canoes or other vessels may have created the Calvert Island footprints when preparing to move from an ancient shoreline to drier ground, the researchers propose.
Further research, including manned submersible sampling and sonar analysis, has revealed the ancient shoreline that emerged during a 200 - year megadrought in the Sierra Nevada between the 9th and 12th centuries, one of many going even further back in time, when precipitation in the area dropped dramatically and the lake level dropped to roughly 200 feet below its current level.
During the Last Glacial Maximum when the Earth was much colder, closed - basin lakes in currently dry parts of western North America, the Middle East and South America were much larger than they are now, as evidenced by radiocarbon dating and other testing of their ancient shorelines.