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

被引:168
作者
Brack, P [1 ]
Rieber, H
Nicora, A
Mundil, R
机构
[1] ETH Zentrum, Dept Erdwissensch, CH-8092 Zurich, Switzerland
[2] Univ Zurich, Inst Paleontol, CH-8006 Zurich, Switzerland
[3] Univ Milan, Dipartimento Sci Terra, I-20133 Milan, Italy
[4] Berkeley Geochron Ctr, Berkeley, CA 94709 USA
来源
EPISODES | 2005年 / 28卷 / 04期
关键词
D O I
10.18814/epiiugs/2005/v28i4/001
中图分类号
P [天文学、地球科学];
学科分类号
07 [理学];
摘要
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 degrees 49 degrees 09.5 '' N, 10 degrees 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.
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页码:233 / 244
页数:12
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