The Global Boundary Stratotype Section and Point (GSSP) of the LADINIAN STAGE (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale
Articolo
Data di Pubblicazione:
2005
Citazione:
The Global Boundary Stratotype
Section and Point (GSSP) of the LADINIAN STAGE (Middle Triassic) at Bagolino (Southern
Alps, Northern Italy) and its implications for the Triassic time scale / P. Brack, H. Rieber, A. Nicora, R. Mundil. - In: EPISODES. - ISSN 0705-3797. - 28:4(2005), pp. 233-244.
Abstract:
The Global boundary Stratotype Section and Point (GSSP) for the base of the Ladinian Stage (Middle Triassic) is defined in the Caffaro river bed (45°49’09.5’’N, 10°28’15.5’’E), south of the village of Bagolino (Province of Brescia, northern Italy), at the base of a 15–20-cm-thick limestone bed overlying a distinct groove (“Chiesense groove”) of limestone nodules in a shaly matrix, located about 5 m above the base of the Buchenstein Formation. The lower surface of the thick
limestone bed has the lowest occurrence of the ammonoid Eoprotrachyceras curionii (base of the E. curionii Zone; onset of the Trachyceratidae ammonoid
family). Secondary global markers in the uppermost Anisian include the lowest occurrence of conodont Neogondolella praehungarica and a brief normal-polarity
magnetic zone recognized in closely correlated sections including the principal auxiliary section at Seceda in the Dolomites. The GSSP-level is bracketed by U-Pb
single zircon age data from volcaniclastic horizons, indicating a boundary age of ca 241 Ma.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
P. Brack, H. Rieber, A. Nicora, R. Mundil
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