marlstone


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marlstone

[′märl‚stōn]
(petrology)
A consolidated rock that has about the same composition as marl; considered to be an earthy or impure argillaceous limestone. Also known as marlite.
A hard ferruginous rock of the Middle Lias in England.
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It is composed by 230 meters of thick layers of marlstone intercalated with limestone.
Varicoloured mixed carbonate-siliciclastic rocks are represented by cement-supported silt- and sandstone, and by dolomitic marlstone and dolostone including siliciclastic material (Fig.
2000) is a mixed scleractinian-siliciclastic succession, reflected by the ichnospecific diversity of the borings by bivalves assigned to Gastrochaenolites ispp., mainly in large colonial scleractinian corals and strombid gastropods, and by burrows (Ophiomorpha, Palaeophycus and Thalassinoides) in sandstones and so-called marlstones (Pickerill and Donovan 1997; Pickerill et al.
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.
To the east of that region, the main part of the Oandu Stage consists of various marlstone and argillaceous limestone comprising the Hirmuse Formation (Fig.
The potential source rocks of paleo-oils for the gases and the associated solid bitumen include Lower Cambrian black shale ([Cam.sub.1]), Lower Silurian Longmaxi Fm ([S.sub.1]l) mudstone and shale, Upper Permian Longtan Fm ([P.sub.3]l) or isochronous Wujiaping Fm ([P.sub.3]w) mudstone, shale, and marlstone, and Upper Permian Dalong Fm ([P.sub.3]d) or isochronous Changxing Fm ([P.sub.3]ch) shale and mudstone [24-26].
The overlying formation is the Xiloutian (Genjiajie) Formation, whose sediments are mainly gray calcareous shale interlayered with light gray marlstone.
The Upper Ordovician is represented by reef and shoal facies packstone and bioclastic limestone and slope facies limestone and marlstone [9] The Silurian to the Carboniferous sequence consists of marine sandstones and mudstones.
Currently, the rock types of oil shale in the world are mainly shale (mudstone), marlstone and carbonate [8].
The organodetrital limestones in the lowermost part of the Blidene Formation are replaced upwards by argillaceous marlstone or by marlstone with thin interbeds or nodules of limestone.
These dolomites were unconformably overlain by middle early Valanginian nannofossil marlstone with calpionellids and very low amounts of foraminifers (Jansa et al., 1988).
It consists of mudstone, sandstone, marlstone, coalbeds, and oil shales.