Tag Archives: radiometric dates

The Bubbles That Changed our Perspective on the World’s Climate

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Camp water supply from a small pond on this iceberg

One of my geology field seasons in the Canadian Arctic worked out of a base-camp on Axel Heiberg Island (west of and snuggled against Ellesmere Island).  It was the spring thaw and all rivers and streams were muddy.  Our only source of clean water turned out to be a small melt-water pond atop an iceberg in Strand Fiord, a few hundred metres offshore.  The helicopter would make daily trips with a 45-gallon drum to collect the water.  The ice and its water were crystal clear and probably a few thousand years old. It was a treat. Perhaps the only thing missing was the occasional Scotch or G&T. Continue reading

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Marrying Fossils, Isotopes and Geological time

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Aportion of William Smith's wonderful geology map of England, Wales and Scotland

Fossils and Strata; Relative geological time

When one sedimentary layer overlies another, we can be fairly certain that the lowermost is the older of the two.  The important step of codifying this relationship in a set of rules was taken up by Nicholas Steno in 1669 (the Law of Superposition). Although fairly obvious now, this was an important intellectual step in understanding what we now call relative time; that things, especially sedimentary strata, are older or younger than other strata.  This is the essence of the science we call stratigraphy. Continue reading

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