Trace fossils and sedimentary facies from a Late Cambrian‐Early Ordovician tide‐dominated shelf (Santa Rosita Formation, northwest Argentina): Implications for ichnofacies models of shallow marine successions
作者:
M. Gabriela Mángano,
LuisA. Buatois,
GuillermoF. Aceñolaza,
期刊:
Ichnos
(Taylor Available online 1996)
卷期:
Volume 5,
issue 1
页码: 53-88
ISSN:1042-0940
年代: 1996
DOI:10.1080/10420949609386406
出版商: Taylor & Francis Group
关键词: Cambrian;Ordovician;Argentina;Ichnofossils;Tide‐dominated shelf
数据来源: Taylor
摘要:
The Santa Rosita Formation is one the most widely distributed lower Paleozoic units of northwest Argentina. At the Quebrada del Salto Alto section, east of Purmamarca, Jujuy Province, it is represented by four sedimentary facies: thick‐bedded planar cross‐stratified quartzose sandstones (A), thin‐bedded planar cross‐stratified quartzose sandstones and mudstones (B), wave‐rippled sandstones and bioturbated mudstones (C), and black and greenish gray shales (D). Paleocurrent data, sandstone architecture, and sedimentary structures from faciès A and B indicate bipolar/bimodal paleoflows, suggesting the action of tidal currents. The succession is interpreted as that of a tide‐dominated shelf, with only secondary influence of wave processes. Trace fossils are restricted to facies B and C.
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