norwegian sea ncs structural geology transect map north sea barents sea structured data supergrid regional structural map dkcs ukcs structural model træna basin någrid syncline trondelag platform structural setting nordland ridge depositional setting vøring basin regional geology helgeland basin hel graben caledonides geological model seismic interpretation crustal trøndelag vøring geology stuctural salt brasil structural landsat tell atlas stratigraphy
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