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A thesis characterizes marine conditions of Aralar mountain range of 120 million years ago
Date:3/22/2010

in these sediments. She also made use of analytical techniques for identifying rock enriched with organic material. In fact, when something important happened in the atmosphere or in the ocean during that period, rocks known as black shales were deposited at the bottom of the sea. These rocks were enriched with organic material, leaving remains thereof in the sedimentary layers. Ms Milln also made use of stable isotopes of carbon, as their proportion depends on the origin and concentration of CO2 present at the time. It is precisely in the Early Aptian that a huge increase of volcanic-origin CO2 took place. She found evidence amongst the sedimentary rocks which were significant in terms of an OAE1 event, thus demonstrating that this phenomenon also had taken place in Aralar.

While looking for the OAE1, Ms Milln also came across another event which, to date, has only been found on Aralar. The point here is that she discovered an interval of rock enriched with organic material, which indicates an enormously significant geological event. However, the ammonites found in this interval show that this event does not correspond exactly to the period in which the OAE1 event occurred, but is a somewhat later (younger) event; from the Upper Early Aptian to be exact. Ms Milln believes it could be a sub-event within the more wide-ranging OAE1 one. It would be, therefore, a regional or local event, given that nothing similar has been found anywhere else to date, and it remains to be seen if anything equivalent does, in fact, exist.

Sudden collapse of the reef platform of Madotz

The biocalcification crisis is another of the representative phenomena of the changes in the Early Aptian. Specifically, in Madotz, in the south-east of the mountain range, there was a reef platform, equivalent to, for example, what is found in the coral reefs of Australia today. As the researcher explained, the biocalcification that commonly occurred
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Contact: Amaia Portugal
a.portugal@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

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