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</html><description>Geologikoki Oltzako Zendea Iru&#xF1;errian kokatzen da, eta haren mendebaldeko aldea da. Azaleratzen diren materialak geologikoki modernoak izan daitezke, zenozoikokoak, hau da, 65 milioi urte baino gutxiago dituztenak. Zendea zeharkatzen badugu Sarbiletik hasita, kareharriak nagusitzen dira, kalkarenito eta tuparriak tartekatuz. Mendiaren behealdera iritsita, Iru&#xF1;erria osoan gehien ezagutzen den eta zabaldutako materiala agertzen da: Iru&#xF1;eko margak (marga [&hellip;]</description></oembed>

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