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Tuesday, December 4, 2012
Ancient Human Poop: Ah, the Tales It Can Tell
Doctoral student Robert D'Anjou with sediment core taken from Lake Liland in the
Lofoten Islands in northern Norway
In the wee hours of the morning in a lab in Amherst, Massachusetts,
geoscience graduate student Rob D’Anjou sat looking over test results, a
pot of coffee nearby. He’d been pulling long days to analyze two narrow
columns of silt, mud, and other sediment cored from the bottom of Lake
Liland in ArcticNorway,
and, frustratingly, was seeing no sign of the molecules with which he’d
been hoping to reconstruct the temperature and precipitation records
during the lake’s last 7,000-odd years.
There were a number of other substances in the cores, though. And
some of those other substances, he realized with a jolt, looked
familiar. He turned to a cache of chemistry papers and, with their help,
confirmed his suspicion: He was looking at human fecal sterols, the
last chemical hurrah of poop. And these feces were decidedly ancient
ones, manufactured, as it were, starting more than 2,000 years ago.