科研之友
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摘要
the orogenic margin of the austral-malvinas foreland basin system is formed by a marine succession exposed at northern pen赤nsula mitre, composed of 550 m of the late paleocene-early eocene foredeep, and more than 2,900 m of the late middle eocene-?miocene mar赤a luisa wedge-top sub-basin. the succession is subdivided in the following formations: la barca (100 m, upper paleocene), punta noguera (450 m, lower eocene), leticia (30 m, upper middle eocene), cerro colorado (935 m, upper middle eocene-upper eocene), puesto jos谷 (nom. nov, 1,600 m, oligocene) and maleng邦ena (nom. nov, 216 m, ?miocene). the foraminiferal content of the maleng邦ena formation is distinguished by the dominance of globocassidulina cf. brocha, and by its particular preservation, features not previously recognized in the argentinean part of the austral basin. syntectonic unconformities are recognized between the paleocene-eocene boundary and the middle eocene, related to regional orog谷nesis; in the uppermost eocene-lowermost oligocene, locally related to the campo del medio anticline; in the %26apos;mid%26apos; oligocene, associated with the maleng邦ena backthrust; and in the ?lower miocene, related to deep structures of the thrust-fold belt.
