6 m of greenish-grey argillite
with a few beds of sandstone.
Alum shale and graptolite argillite
form patches over extensive areas in the outskirts of the Baltica palaeocontinent .
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.
Origin of Tremadoc kerogenous-bearing siltstones and argillites
of North Estonia.
Distribution of molybdenum and uranium in the Tremadoc Graptolite Argillite
(Dictyonema Shale) of north-western Estonia.
The drilling confirmed that anomalous gold mineralization is most often associated with the more altered, veined and fractured sections of the interbedded quartzites and argillites
The Kurejka Fm (up to 104 m thick) is represented by grey, green and red argillites
The geological horizons can be areconnaEtre clays Plicatules the Aptian, argillites
Callovian-Oxfordian clays etmarnes Gault, clays and marls domeriennes without this list being exhaustive.
sequence of argillites
with quartz stockwork and is approx 65 metres
The Estonian black argillites
and mudstones were formed during the period of time from Late Cambrian (Furongian) to Early Ordovician (Tremadoc).
of gold-bearing zones hosted in argillites
, black phyllites and wackes of Middle Triassic age.