It is composed by 225 meters of thick layers of sandy marlstones
and sandstones intercalations (with cross-bedding) and containing glauconite, which is the cause of the green colour of marlstones
2) dolomitic marlstones
(25% < IR < 50%)--29 samples;
On the basis of the identification of bentonites, we assume that the deep-sea marlstone
in the Ohesaare section correlates with the shallow-water Rumba Formation.
The concentrations of trace elements in 28 raw Changshe Mountain oil shale and marlstone
samples are presented in Tables 2 and 3.
The shoreward facies are mainly represented by limestones and marlstones
, which are replaced by more clayey rocks in deeper-water areas.
As discussed below, the Lunpola basin oil shale, mudstone and marlstone
were deposited in hypersaline environments, and the organic matter derived from these rocks should exhibit similar enrichment and consistent isotopic trends.
with varying clay content, including interbeds of dolostone and claystone, dominate in the sequence and few interlayers of grey siltstone occur in its upper part.
is dominating in the lowermost part of the formation; its content decreases gradually higher in the interval.
The basal layer of the Upper Pskov unit in the Ape section consists of a 2 m thick complex of grey dolomitic marlstone
and clayey thin-bedded dolostone.
The lower, Vadja Fm is represented by a thin-bedded 16-20 m thick complex of alternating light grey and yellowish dolostone, grey dolomitic marlstone
and dark grey claystone (Kuningakula 6950 drill core, 12.
Light grey avg: 3 (Aeronian + calcareous sd: Rhuddanian) marlstone
2008) System Series Regional Stage Ordovician Upper Uhaku Lasnamagi Aseri Kunda Volkhov Lower Billingen Hunneberg Pakerort Cambrian Furongian Terreneuvian Dominopol' Lontova Ediacaran Kotlin System Lithology Thickness, m Ordovician Limestone, marlstone
0-16 Limestone 0-9 Limestone 2-3 Limestone 6-9 Limestone, dolostone 2-3 Limestone, sandstone 0.