Climate issue: Travertine, a type of limestone, records the ice ages
, people have viewed springs as mystical. From the warm pools of Roman Bath, whence sheets of lead inscribed with prayers have been recovered, to the gassy waters beneath the Oracle of Delphi that are thought to have stimulated the visions experienced by Apollo’s sacred priestesses, these sites have been sought out for purposes of divination.
Dr Rickett’s starting point is his assumption that, as ice ages end and the world warms up, underground water flows will increase simultaneously all around the planet. Moreover, as water travels through the ground it dissolves and picks up minerals, particularly calcium carbonate.
To his further delight, the dates he deduced for warm and cold periods matched those from the existing way of dating them, which measures the ratio of isotopes of oxygen in fossil teeth—for this ratio is temperature dependent. That different dating methods have arrived at the same conclusion in this way is a useful confirmation that palaeoclimatologists’ dates for events in the past few hundred thousand years are correct.
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