Trace fossils on and above the transgressive surface. substrate consistency and phosphogenesis (Lower ordovician, StPetersburg Region, Russia)

0049117 - GLÚ 2007 RIV SK eng J - Článek v odborném periodiku
Ershova, V. B. - Fedorov, P. V. - Mikuláš, Radek
Trace fossils on and above the transgressive surface. substrate consistency and phosphogenesis (Lower ordovician, StPetersburg Region, Russia).
[Ichnofosilie na transgresivním povrchu a v jeho nadloží: vztah ke knonzistenci substrátu a k fosfogenezi (spodní ordovik, Petrohradská oblast, Rusko).]
Geologica Carpathica. Roč. 57, č. 5 (2006), s. 415-422. ISSN 1335-0552. E-ISSN 1336-8052
Grant CEP: GA ČR GA205/04/0151
Výzkumný záměr: CEZ:AV0Z30130516
Klíčová slova: firmgrounds * platform sediments * trace fossils
Kód oboru RIV: EG - Zoologie
Impakt faktor: 0.364, rok: 2006
http://www.geologicacarpathica.sk/src/main.php http://arl-repository.lib.cas.cz/uloziste_av/GLU-S/cav_un_epca-0049117_01.pdf

Basal layers of the Leetse Formation (Lower Ordovician, St Petersburg Region, Russia) are characterized ichnologically by: 1, local occurrence of the ichnogenera Conichnus, Bergaueria and ?Thalassinoides at the base. These traces originated by burrowing in consolidated substrate of the underlying black, clayey Dictyonema Shale and were buried by the basal bed of the Leetse Fm.; 2, the layer with camerate burrows (Amphorichnus div. isp.), filled with phosphatic substrates, ca 15 cm above the base. Considering the position of the localities of the phosphatised burrows in the basin, we presume that borrows on tops of tectonically uplifted blocks were filled by phosphorite matter (chiefly remains of shells of invertebrate brachiopods) brought by currents from the bottom of trenches in the basin.

Ve spodním ordoviku okolí Petrohradu (Rusko) se vyskytují morfologicky variabilní ichnofosilie kapkovitého tvaru, vyplněné fosfátem. Ten je v daných segmentech sedimentační pánve jediným dokladem epizody fosfogeneze.
Trvalý link: http://hdl.handle.net/11104/0139596