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Lower Ordovician Siphonia cylindrica Eichwald, 1840 from north-western Russia: a pseudo-sponge and a natural ‘recorder’ of geological history. / Федоров, Петр Владимирович.
In: Bulletin of Geosciences, Vol. 93, No. 4, 20.12.2018, p. 463 - 476.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Lower Ordovician Siphonia cylindrica Eichwald, 1840 from north-western Russia: a pseudo-sponge and a natural ‘recorder’ of geological history.
AU - Федоров, Петр Владимирович
N1 - Fedorov , P.v. 2018. Lower Ordovician Siphonia cylindrica Eichwald, 1840 from north-western Russia: a pseudo-sponge and a natural ‘recorder’ of geological history. Bulletin of Geosciences 93(4), xxx–xxx (5 figures). Czech Geological Survey, Prague. ISSN 1214-1119.
PY - 2018/12/20
Y1 - 2018/12/20
N2 - The composition, structure and texture of hard, pebble-sized mineral bodies resembling rounded cylinders with a through-going axial cavity, ascribed by Eichwald (1840) to fossil Porifera under the name Siphonia cylindrica, have been re-examined. The objects can be found at two sites in the vicinity of St. Petersburg (north-western Russia), where they are located at the base of a weakly cemented glauconitic sandstone of the Leetse Formation (Lower Ordovician, Floian). Specimens of S. cylindrica from the collection of Eichwald and a new collection gathered by the author were imaged using scanning electron microscopy (SEM) imaging, energy-dispersive X-ray microanalysis (EDX), and X-ray microtomography (micro-CT). The new data negate previous erroneous assumptions about the siliceous sponge nature of these bodies and suggest that these are phosphorite pseudofossils of nodular genesis. Host rock composition and condition, as well as the main features of the formation and reworking of the nodules, were recorded inside the nodules and only now are available for recovery and discussion.
AB - The composition, structure and texture of hard, pebble-sized mineral bodies resembling rounded cylinders with a through-going axial cavity, ascribed by Eichwald (1840) to fossil Porifera under the name Siphonia cylindrica, have been re-examined. The objects can be found at two sites in the vicinity of St. Petersburg (north-western Russia), where they are located at the base of a weakly cemented glauconitic sandstone of the Leetse Formation (Lower Ordovician, Floian). Specimens of S. cylindrica from the collection of Eichwald and a new collection gathered by the author were imaged using scanning electron microscopy (SEM) imaging, energy-dispersive X-ray microanalysis (EDX), and X-ray microtomography (micro-CT). The new data negate previous erroneous assumptions about the siliceous sponge nature of these bodies and suggest that these are phosphorite pseudofossils of nodular genesis. Host rock composition and condition, as well as the main features of the formation and reworking of the nodules, were recorded inside the nodules and only now are available for recovery and discussion.
KW - pseudo-fossil, phosphorite nodules, Dictyonema Shale, Leetse Formation
KW - NW Russia.
KW - pseudo-fossil
KW - phosphorite nodules
KW - Dictyonema Shale
KW - Leetse Formation
KW - NW Russia
U2 - 10.3140/bull.geosci.1691
DO - 10.3140/bull.geosci.1691
M3 - Article
VL - 93
SP - 463
EP - 476
JO - Bulletin of Geosciences
JF - Bulletin of Geosciences
SN - 1214-1119
IS - 4
ER -
ID: 35180425