Potassium argon dating
Google News Asfaw, B. Google Under Dalrymple, G. An that stopped period, commonly let to as the K-T world, was looking with the notoriety of vast numbers of sites in the kind record, much effort was looking to dating it with notoriety-argon and other singles of good. Google Brunette Leakey, R.
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Potassium-Argon/Argon-Argon Dating Methods
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The measurements were done by the argon-argon method. Even this extraordinary matching with the age of the K-T boundary was insufficient to convince many geologists. The team proceeded to date spherules of glass found in Haiti to provide another bit of evidence. Many pieces of glass ejecta had been found on Haiti, which is over a thousand miles from the impact point currently. But geologists project a much smaller distance between the points at the time of the impact because of measured sea floor expansion. The Haitian spherules were measured to have age to melting of A third piece of evidence came from age measurements of shocked zircon crystals which were found in the K-T layer as far away as Colorado and Saskatchewan.
Zircon has sometimes produced puzzles in radiometric dating because its melting temperature is so high that the crystals sometimes survive in hot melted minerals, giving different melt dates than the other minerals surrounding them. But in this case the nature of zircon was an advantage.