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Litostratygrafia dolnego syluru w odsłonięciu Bardo Stawy (południowa część Gór Świętokrzyskich) - związek ze zmianami poziomu morza i cyrkulacją oceaniczną

Trela W., Salwa S.

Przegląd Geologiczny

2007

Vol. 55, nr 11

971-978

The lower Llandovery black radiolarian cherts and shales of the Bardo Formation are interpreted as transgressive to highstand deposits produced by the marine flooding initiated in latest Ordovician time (persculptus graptolite zone). This formation was divided into the Rembów radiolarian chert Member and Zbrza shale Member. The sedimentary record of the Rembów Member was folded due to the late Caledonian tectonic activity. The accumulation of the radiolarian cherts was influenced by an upwelling system generated by the SE trade winds, which were active along the southern margin of the southern Holy Cross Mountains.

Jurassic – Early Cretaceous succession in Ab-Band area, High Zagros (SW Iran)

Moghaddasi J., Babazadeh S.

Volumina Jurassica

2006

Vol. 4, no. 1

99-99

The Jurassic - Early Cretaceous sedimentary rocks of Ab-Band area are located in the High Zagros, southwest Iran. Two sections are examined in this region. They are consisting of two units: Chert and Turbidites Unites. Chert Unit consists of red radiolarian chert with 50% Radiolaria, calcareous chert, white and grey radiolarian chert and argillaceous chert. The best preserved radiolarian fauna occurs in this unit. Turbidite Unit is composed of calcarenite, pelbiomicrosparite with nodular radiolarian chert and argillaceous limestone bearing benthic foraminifera. Two size radiolarian fauna are reported in thin sections. The larger forms are found in lower part of section AÁ and the smaller forms are occuring in the radiolarian chert at section Ca in the Chert Unit. The benthic marine fauna include Pseudocyclamina sp., Pseudocrysalidina sp., Lenticulina aff. quenstedti, miliolids and echinoids.