What is evidence of past glaciation?
Such erratics provide evidence of glacial flow lines. Examples include omars, jasper conglomerates, and tillites. Other evidence for glaciation is recorded on some bedrock surfaces beneath the glacial drift. Scratches made by rocks frozen into basal ice scraping over the bedrock are called striae.Click to see full answer. Similarly, you may ask, what rock type…
Such erratics provide evidence of glacial flow lines. Examples include omars, jasper conglomerates, and tillites. Other evidence for glaciation is recorded on some bedrock surfaces beneath the glacial drift. Scratches made by rocks frozen into basal ice scraping over the bedrock are called striae.Click to see full answer. Similarly, you may ask, what rock type is conclusive evidence of past glaciation?a) Conglomerate.Secondly, what do glaciers tell us about Earth’s past? Glaciers preserve bits of atmosphere from thousands of years ago in these tiny air bubbles, or, deeper within the core, trapped within the ice itself. This is one way scientists know that there have been several Ice Ages. Scientists are also finding that glaciers reveal clues about global warming. In this way, what evidence do we have of past ice ages? There are three main types of evidence for ice ages: geological, chemical, and paleontological. Geological evidence for ice ages comes in various forms, including rock scouring and scratching, glacial moraines, drumlins, valley cutting, and the deposition of till or tillites and glacial erratics.How did glacial deposits provide evidence that Pangaea had existed?The glacial deposits show that pangaea (Supercontinent) existed. It was known that when glaciers move across the surface of the earth, they leave marks, grooves and deposits on the rocks and in that area. From these glacials deposits we can trace the direction of ice movement.
