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During my second year of college, I had my first existential crisis and a paranormal event changed my studies from science to business.
I still held my energy dreams, however, and in 1986, eight years after that first paranormal event, I had a second one that suddenly caused me to move up the coast from Los Angeles to Seattle, where I landed in the middle of what is arguably the greatest attempt yet made to bring alternative energy to the American marketplace.
), and (2) large-scale extension in Laurentia, while low Th/U ratios (0.1–1.0) correspond to overall compressional phases (i.e., terrane accretion and orogenesis). More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years.With the exception of the radiocarbon method, most of these techniques are actually based on measuring an increase in the abundance of a radiogenic isotope, which is the decay-product of the radioactive parent isotope. They are produced by cosmic rays interacting with Earth materials.So, though they are in different geographic sites, there is certainty about their age-equivalence.Fossil faunal and floral assemblages, marine and terrestrial, make for distinctive marker horizons.