The Triassic-Jurassic boundary in the Andes of Argentina

RICCARDI, ALBERTO CARLOS; DAMBORENEA, S.E.; MANCEÑIDO, M.; IGLESIA LLANOS, MARÍA PAULA

RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA

UNIV STUDI MILANO

Lugar: Milan, Italia; Año: 2004 vol. 110 p. 69 - 76

0035-6883

The Arroyo Malo Formation at Alumbre Creek, on the northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated petites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals System boundary, consisting of massive and laminated petites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals System boundary, consisting of massive and laminated petites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals System boundary, consisting of massive and laminated petites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals ammonoids, nautiloids, bivalves, gastropods, brachiopods and corals northern bank of the Atuel River, west central Argentina, comprises a c. 300 m thick continuous marine succession across the Triassic-Jurassic System boundary, consisting of massive and laminated petites indicative of a slope depositional environment. Late Triassic invertebrates, including ammonoids, nautiloids, bivalves, gastropods, brachiopods