During the Eifelian carbonate sedimentation was superseded by the deposition of calcareous shales and siliclastic
sediments - this change represents the first manifestation of the Variscan Orogeny.
The Genna Selole Fm locally starts with carbonates with scattered siliclastic
pebbles that are related to the topmost Ussassai-Perdasdefogu lithofacies.
The topic is siliclastic
mudrocks, commonly known as shales.
Two cores drilled in June 2009 revealed about 130 m of laminated diatomite representing at least 120,000 years of deposition over the life of the lake which was a closed system with little terrigenous siliclastic
(minerogenic) component was calculated by subtracting the amounts of [LOI.sub.550] and [LOI.sub.950] from the dry mass.
Dix, G.R., Coniglio, M., Riva, J.F.V., and Achab, A., 2007, The Late Ordovician Dawson Point Formation (Timiskaming outlier, Ontario): Key to a new regional synthesis of RichmondianHirnantian carbonate and siliclastic
magnafacies across the central Canadian craton: Canadian Journal of Earth Science, v.
Dolostone is microcrystalline with intercalations of thin laminae of siliclastic
mudstone and gypsum.
Successive flooding and evaporation led to the cyclical formation of layers of carbonates, siliclastic
rocks and evaporite rocks.
rocks of Estonia have also a higher total iron content than Cambrian siliciclastics (Shogenova et al.
auriculatus is found in littoral siliclastic
or mixed siliclastic-carbonate sediments.
If we are interested in the distribution of allochthonous siliclastic
matter in sedimentation processes, it is necessary to have for analysis purified material, that is the disaggregate flocs and sorbed materials (organics, carbonates, etc.) have to be removed from the grains.