Dictyonema Shale

Dictyonema Shale

 

second stratigraphic horizon from the bottom of the Silurian deposits, found in Leningrad Oblast and the Estonian SSR. It is represented by clay shales that are rich in organic matter and contain graptolitic fossils (Dictyonema flabelliformis Hall) and more rarely brachiopod fossils (O bolus appolinis Eichw). Thickness varies from 0.12 to 4 m. The Dictyonema shale corresponds to the upper part of the Tremadocian series.

References in periodicals archive ?
Grain size analysis and mineralogy of the Tremadocian Dictyonema shale in Estonia.
86) During the implementation of the Soviet uranium project, a top secret uranium factory (Kombinat No 7) was erected in Sillamae, and a test facility, officially called paint factory (krassilnaja fabrika), was established in Narva to test and develop the technology of extracting uranium from the Dictyonema shale found in north-eastern Estonia (the average uranium content of Dictyonema shale is 0.
The target was composed of the stratified sedimentary cover comprising (from the top) bedded Upper and Middle Ordovician limestone (up to 20 m thick), Lower Ordovician Dictyonema shale (argillite with an admixture of organic matter, about 2 m thick), and an up to 200 m thick layer of Lower Ordovician to uppermost Vendian sand, silt, and some clay, which covered the Precambrian basement consisting of granites, gneisses, amphibolites, and other crystalline rocks.
Mineralogy and geochemistry of obolus sandstones and dictyonema shale of North Estonia.
In the world OS overviews, the Estonian kukersite and Dictyonema shale reserves are assessed on the basis of their energetic value.
The name was applied to a transition between the Dictyonema Shale (with many interbeds of quartzose sandstone in the lower part) of the Turisalu Formation and the Obolus Sandstone represented in NE Estonia.
On the distribution of graptolites in the Dictyonema shale of Estonia and the noncontemporaneity of its different facies.
One sample comes from the Tremadocian graptolite-argillite, the Dictyonema shale or argillite, as it was called in the earlier literature (for the change of the name see [16]), from a shallow shelf setting.
2%), and its main minerals [alumosilicates, carbonates, pyrite, quartz, kaolinite and halloysite, and enrichment residue of Dictyonema shale (Dict.
Estonian argillites have for a long time been known as Dictyonema shale [1], and the appearance of the first planktic graptolite Dictyonema flabelliforme (now Rhabdinopora flabelliformis) was taken as the local base of the Ordovician system.
Oxidation of dictyonema shale in Maardu mining waste dumps // Oil Shale.