Berez, Kortazarreko Haitza ur-azpiko sumendia zen. Gerora, itsasorako bidean Deba ibaiak pare-parean topa zuen eta, mendia basaltozkoa izanik, ezin zuen jan; horregatik, Osintxu pasa eta gero, ibaiak mendiari ezkerretik buelta ematen dio.
Ibilbide honetan sumendiaren aztarnak ikusiko ditugu, petrologia aldetik oso interes zientifiko altukoa, eta geomorfologia aldetik interesekoa ere.
Ibilbidearen hasiera eta bukaera oinez egingo dugu, eta tartekoa, berriz, automobilez.
Mapa kargatzen...
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class=\"mw-parser-output\"\u003E\u003Cp\u003EKuxin-labak: Arkaitzeko tunela\n\u003C/p\u003E\u003C/div\u003E","title":"Kuxin-labak: Arkaitzeko tunela\n","link":"","lat":43.170201,"lon":-2.407008,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EKuxin-labak: Agarreboluko bidea\n\u003C/p\u003E\u003C/div\u003E","title":"Kuxin-labak: Agarreboluko bidea\n","link":"","lat":43.169905,"lon":-2.406402,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBarrenetxe ondoko sill-a\n\u003C/p\u003E\u003C/div\u003E","title":"Barrenetxe ondoko sill-a\n","link":"","lat":43.1783,"lon":-2.404832,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EKortazarreko trakitak\n\u003C/p\u003E\u003C/div\u003E","title":"Kortazarreko trakitak\n","link":"","lat":43.191616,"lon":-2.41779,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ci\u003EEztandolmena\u003C/i\u003E azaleratzea\n\u003C/p\u003E\u003C/div\u003E","title":"Eztandolmena azaleratzea\n","link":"","lat":43.186355,"lon":-2.395819,"icon":""}]}
Ibilbidearen zati hau oinez egingo dugu. Automobila geltokiaren inguruan aparkatu ostean, Osintxurantz hartuko dugu.
Kuxin-labak dira laba koladak hozterakoan har daitekeen forma bat, kuxinena, alegia. Trenbidea egiterakoan mendia apurtu zutenean Soraluzeko paraje honetan kuxin mota guztiak agertu ziren, bai luzetarako sekzioetan (tubularretan), bai zeharkakoetan: azal leuneko eta azal zimurreko kuxinak, kuxin tubularrak, zirkularrak, pedunkulatuak... Gainera, kuxin asko apurtu zituztenez, hauek barruko egitura erakusten dute.
Bide osoan kuxinak agertzen dira, baina ba dira bi leku nabarmentzen direnak. Bata, Arkaitzeko tunelaren ibaialdeko aldea, oso kuxin-laba handiak eta garbiak erakusten dituela. Eta bestea Agarrebolun bidean dago, aurrekoaren gainean.
Behin kuxin-labak ikusi eta gero, atzera egingo dugu automobila hartzeko eta San Andresetik barrena Kortazarreko Haitzera joateko... baina beti dago oinez igotzeko aukera!
Bertan Kretazeoko itsaspeko konplexu bolkanikoaren produktu ia guztiak agertzen dira:
Soraluzen dagoen sumendiaren ebakiduraren berezitasun garrantzitsuena sill pikritikoa da, ohizkoa ez dira eta.
Magma basaltikoen kristaltze frakzionatu bidez eratzen dira, eta agerian uzten dute magma basaltikoek sakonera txikiko uretako ganbera magmatikoetan duten gelditasuna eta bereizkuntza.
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