期刊
JOURNAL OF IBERIAN GEOLOGY
卷 40, 期 3, 页码 539-555出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.5209/rev_JIGE.2014.v40.n3.44308
关键词
Ichnofossils; Arenigian; clastic sediments; Gondwana; peri-Gondwana; Iberia
类别
资金
- Jagiellonian University
- Secretaria de Estado de I+D+I, Spain [CGL2008-03007, CGL2012-33281]
- Junta de Andalucia [RNM-3715, RNM-178]
Nineteen ichnospecies belonging to thirteen ichnogenera (Archaeonassa, Catenichnus, Cochlichnus, Cruziana, Didymaulichnus, ?Diplichnites, Gordia, Lingulichnus, Lockeia, cf. Monocraterion, Planolites, Ptychoplasma, and Rusophycus) occur in the Pochico Formation (Arenigian) in the Aldeaquemada section, Sierra Morena, southern Spain, just above the Armorican Quartzite. They belong to the archetypal Cruziana ichnofacies, indicating a lower shoreface-upper offshore zone. The low degree of sediment reworking may be due to a high rate of sedimentation. The trace fossil assemblage, rich in large Cruziana, is typical of the Armorican Quartzite that developed on the margins of Gondwana and peri-Gondwanan microcontinents. The distribution of ichnofauna during the Early Ordovician was partly palaeogeographically controlled, although ichnological data from the literature point to paths of migration between Gondwana, Baltica and Laurentia. Differences between the ichnofauna of Gondwana and Baltica could be conditioned by facies (clastics in Gondwana and carbonates in Baltica) causing a taphonomic filter, because Cruziana requires diversified clastic deposits for preservation. The ichnofauna would also be influenced by trophic group amensalism between filter feeding and deposit feeding fauna, the former prevailing in Baltica and the latter in Gondwana.
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