Stratigraphic and paleoenvironmental reconstruction of a mid-Pliocene fossil site in the High Arctic Ellesmere Island, Nunavut: This isotope may be produced by cosmic ray spallation of calcium or potassium. It is mixed with Niobium NB and pressed into a copper cathode. Holocene deglacial history of the north east Antarctic Peninsula — a review and new chronological constraints. This can be a particular problem in Antarctica, where cold-based ice may repeatedly cover a boulder, preventing the accumulation of cosmogenic nuclides, without eroding or even moving the rock.
An age determined by measurement of the amount of each nuclide would be an estimate of the minimum time that the particular surface had been exposed, but would not date the maximum age of the surface exposure, that is, the surface could have been exposed for much longer than the minimum calculated age.
The acids are changed daily. Rocks can therefore be left in a stable position or moved slightly, without having suffiicient erosion to remove cosmogenic nuclides from a previous exposure. Terrestrial and freshwater carbonates in Hoxnian interglacial deposits, UK: Produced by interaction with cosmic rays. Once absorbed, it reacts vigorously with the calcium in your bones, forming Calcium Flouride which may then be deposited in your arteries. Published production rates are available for different parts of the Earth.