Geochemical heterogeneity of Estonian graptolite argillite
6 m of greenish-grey argillite
with a few beds of sandstone.
These conglomerates include angular to sub-rounded heterometric clasts of igneous rocks, dolomites, argillites
and quartzites (Fig.
The Eskay Creek deposit in the Iskut River area consists of precious metal-rich sulfide-sulfosalt lenses in argillite
and veins in a footwall rhyolite.
5 metres of steeply dipping, interbedded, light yellow-grey to light grey argillite
, calcareous argillite
and minor siltstone.
It is overlain by quartzites and argillites
of the Misri Banda quartzite (Pogue and Hussain1986; Pogue et al.
The occurrence of Middle Cambrian to Late Ordovician organic-rich black shale deposits in an extensive area of Sweden (alum shale ), the Oslo region , Bornholm , Estonia (known as graptolite argillite
, "Dictyonema shale" , and kukersite as proper oil shale), Poland  and NorthWest Russia  has been known for a long time.
On the geochemistry of postsedimentary mineral formation in the Tremadoc graptolitic argillites
of North Estonia.
Geological horizons can be recognized clays Plicatules the Aptian, argillites
Callovian-Oxfordian clays and marls of the Gault, clays and marls domeriennes without this list being exhaustive.
Surface mapping and prospecting on the Dewdney Trail Property have identified areas with anomalous gold mineralization along a 13 kilometre trend of quartz-sericite-carbonate altered quartzite and interbedded argillites
The Kurejka Fm (up to 104 m thick) is represented by grey, green and red argillites
Geological horizons can be recognized clays Plicatules the Aptian, Callovooxfordien argillites
, clays and marls Gault clays Domerian, without this list being exhaustive.