NDLI: Sedimentology and taphonomy of sirenian remains from the Middle Eocene of the Pamplona Basin (Navarre, western Pyrenees)

Content Provider	Springer Nature Link
Author	Astibia, Humberto Payros, Aitor Suberbiola, Xabier Pereda Elorza, Javier Berreteaga, Ana Etxebarria, Nestor Badiola, Ainara Tosquella, Josep
Copyright Year	2004
Abstract	Sirenian vertebrae and ribs have been recently discovered from two Middle Eocene localities of the Pamplona Basin, Navarre (western Pyrenees). These outcrops correspond to different lower Bartonian lithostratigraphic units: the lower part of the Pamplona Marl Formation (Uztarrotz site) and the upper part of the Ardanatz Sandstone (Ardanatz site). The former represents a deep and low-energy sea floor far away from a deltaic slope; the Ardanatz environment probably corresponds to a semi-closed deltaic bay periodically affected by catastrophic floods (i.e., fluvial hyperpycnal flows). The presence of epibiontic activity suggests that the bones were exposed for a while prior to the burial. The histological structures are well preserved except in the peripheral region, where tubular-like microstructures filled by pyrite and iron oxides probably correspond to microbial bioerosion. The major mineral component of the fossil bones is francolite (carbonate fluorapatite). In the Ardanatz samples there is evidence of secondary francolite due to the late replacement of original carbonate fluorapatite through internal fractures. The Ardanatz and Uztarrotz sirenian fossils do not show any evidence of reelaboration. They have similar sum of rare earth elements (REE) concentrations relative to the host rock, but comparatively lower than in other vertebrate fossil bones. This feature may be due to the dense compact structure of pachyosteosclerotic sirenian bones.
Starting Page	463
Ending Page	475
Page Count	13
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	50
Issue Number	3-4
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-11-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sirenians Taphonomy Geochemistry Sedimentology Eocene Western Pyrenees
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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