Techniques de speed dating
By combining multiple geochronological (and biostratigraphic) indicators the precision of the recovered age can be improved.Geochronology is different in application from biostratigraphy, which is the science of assigning sedimentary rocks to a known geological period via describing, cataloging and comparing fossil floral and faunal assemblages.A number of radioactive isotopes are used for this purpose, and depending on the rate of decay, are used for dating different geological periods.More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years.
Absolute geochronology can be accomplished through radioactive isotopes, whereas relative geochronology is provided by tools such as palaeomagnetism and stable isotope ratios.Exposure dating uses the concentration of exotic nuclides (e.g.Cl) produced by cosmic rays interacting with Earth materials as a proxy for the age at which a surface, such as an alluvial fan, was created.Following approximately four minutes of conversation, a bell is rung, the men proceed to the next lady, and another four-minute speed date begins. Following each speed date, participants mark on a card whether they would have an interest in meeting their date again.If a mutual interest is noted, meaning that the person you have picked has also picked you, the organizers provide each party with the other's contact information (email and nickname). You arrange to meet and start getting to know each other.