Cantabrian cornice has seen 7 cooling and warming phases over past 41,000 years

June 4th, 2009 - 3:59 pm ICT by ANI  

Washington, June 4 (ANI): A new research has shown that there have been seven periods of cooling and warming in the Cantabrian cornice in Spain over the past 41,000 years.

In 1996, an international team of scientists led by the University of Zaragoza (UNIZAR) started to carry out a paleontological survey in the cave of El Miron.

Since then, they have focused on analyzing the fossil remains of the bones and teeth of small vertebrates that lived in the Cantabrian region over the past 41,000 years, at the end of the Quaternary.

The richness, great diversity and good conservation status of the fossils have enabled the researchers to carry out a paleoclimatic study.

“We carried out every kind of statistical analysis over a six-month period at the University of New Mexico, analyzing around 100,000 remains, of which 4,000 were specifically identified, and catalogued according to species and the number of individuals in each stratum,” said Gloria Cuenca-Bescos, lead author of the study and a researcher in the Paleontology Department of the UNIZAR’s Institute for Scientific Research (IUCA).

The resulting study involves climatic inferences being drawn on the basis of the fossil associations of small mammals whose remains have been deposited in El Miron over the past 41,000 years.

The fossil associations of these mammals reveal the composition of fauna living around the cave at the time, and have made it possible to develop a paleoclimatological and paleoenvironmental reconstruction of the environment.

The research shows that there have been seven periods of cooling and warming in the Cantabrian cornice over the past 41,000 years.

An analysis carried out by other authors on data relating to pollen, marine isotope stratigraphy, and materials deposited by glaciers backs this up this result.

According to the study, there were four unstable cold periods; two more stable ones, and a temperate climatic period at the El Miron cave.

The scientists are unsure about dating the seventh and last period ended, as this “could correspond with the Bronze Age, the Ice Age, or the start of agricultural expansion by human beings, which certainly would have impacted on the wild animals living close to the caves.”

However, the study shows that during earlier periods at the end of the Late Pleistocene, the species that predominated during cold periods were rodents and insectivores that were well-adapted to environments with only sparse vegetation.

According to Cuenca-Bescos, this domination by woodland species started to decline in the area only at the end of the Holocene, when human activities began to change the landscape. (ANI)

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