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What a 66-million-year-old forest fire reveals about the last days of the dinosaurs
Date:6/5/2014

This news release is available in French.

As far back as the time of the dinosaurs, 66 million years ago, forests recovered from fires in the same manner they do today, according to a team of researchers from McGill University and the Royal Saskatchewan Museum.

During an expedition in southern Saskatchewan, Canada, the team discovered the first fossil-record evidence of forest fire ecology - the regrowth of plants after a fire - revealing a snapshot of the ecology on earth just before the mass extinction of the dinosaurs. The researchers also found evidence that the region's climate was much warmer and wetter than it is today.

"Excavating plant fossils preserved in rocks deposited during the last days of the dinosaurs, we found some preserved with abundant fossilized charcoal and others without it. From this, we were able to reconstruct what the Cretaceous forests looked like with and without fire disturbance", says Hans Larsson, Canada Research Chair in Macroevolution at McGill University.

The researchers' discovery revealed that at the forest fire site, the plants are dominated by flora quite similar to the kind that begin forest recovery after a fire today. Ancient forests recovered much like current ones, with plants like alder, birch, and sassafras present in early stages, and sequoia and ginkgo present in mature forests.

"We were looking at the direct result of a 66-million-year old forest fire, preserved in stone," says Emily Bamforth, of the Royal Saskatchewan Museum and the study's first author. "Moreover, we now have evidence that the mean annual temperature in southern Saskatchewan was 10-12 degrees Celsius warmer than today, with almost six times as much precipitation".

"The abundant plant fossils also allowed us for t
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Contact: Cynthia Lee
cynthia.lee@mcgill.ca
514-398-6754
McGill University
Source:Eurekalert  

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