Sentences with phrase «by glacial deposits»
The peat layer is embedded in a sandy deposit capped by a glacial deposit.
https://pubs.geoscienceworld.org/ Not exact matches
The Dry Valleys» most striking similarity to the Red Planet is in glacial deposits laid down by ice so cold that meltwater never reworks the surface features.
Here we show that the East Greenland Ice Sheet existed over the past 7.5 million years, as indicated by beryllium and aluminum isotopes (10Be and 26Al) in quartz sand removed by deep, ongoing glacial erosion on land and deposited offshore in the marine sedimentary record.
This is because terrestrial deposits of ancient glacial and interglacial periods1 — 3 are overrun and eroded by more recent glacial advances, and are therefore usually rare, isolated and poorly dated.
Moraine Creek is certainly an apt name; it has carved through an impressive cake of glacial deposits containing rocks of all origins and colors, ground together, mixed, and mashed by creeping glaciers.
I've sometimes thought that global cataclysms like the largest volcanic eruptions would disrupt the glacial records by many years, like Oruanui eruption c. 26500bp, as these would induce unrecorded behavior in weather and other things, f.e. the huge ash deposits might decrease the albedo so much a local melting event happens.
Major ice sheets, in particular in Greenland [8], ocean methane clathrate deposits [9], and future evolution of glacial / interglacial cycles [10] might be affected by that long tail.
We can determine the past climate of the Earth by mapping the distribution of ancient coals, desert deposits, tropical soils, salt deposits, glacial material, as well as the distribution of plants and animals that are sensitive to climate, such as alligators, palm trees & mangrove swamps.
above: the calling - card of an ancient ice - age - an outcrop in Namibia of an ancient (Proterozoic) tillite of glacial origin, overlain by a dolomitic «cap - carbonate» sequence of marine origin, deposited in warmer post-glacial conditions.
The drill core penetrated 514 m of silts and silty clays (glacial deposits) punctuated by muds and episodic 0.02 — 1.2 m thick terrigenous sands (interglacial deposits) 22.