Tag Archives: late Cretaceous

High up in Colombia

The lyrics of Neil Young* were going through my head as we trundled down the decline of a mineshaft at 3000 m elevation. We had left the brilliant blue skies of the Andean cordillera moments before, plunging into the darkened tunnel; we were headed for the Guaduas Formation (Late Cretaceous – Paleocene), which contains some […]

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