Fourteen samples from interbeds
of supposedly volcanic origin were collected from six drill cores from Saaremaa Island, Estonia, and two cores from Latvia (Fig.
Suites from TF13a and TF18b occur in wave rippled sandstones that interbed
of cap the cross-stratified sandstone; relatively organic-rich ripple troughs are preferentially bioturbated.
in the Silurian of the southwestern part of the East European Platform.
Quartzose sandstone contains glauconite grains in 1-2 mm above and under this shale interbed
In the lower part occurs a lens-shaped conglomerate interbed
(0-12 cm) with smooth flat pebbles of different dolostones.
form embayments on the rugged coast, and many of these beds pinch out northwestward into conglomerate.
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Drilling has identified three primary sub horizontal gold zones; an upper zone at the Permian limestone/Tertiary sediment unconformable contact, a middle horizon at a marble/silty limestone interbed
and a lower zone at a volcanic lava/silty limestone contact and a fourth zone of post surface weathering/oxidation of the primary lodes (regolith) occurring in modern karst environment.
This suggests the megaripple sandstone/fine grained sandstone/siltstone interbed
sequence formed in a fluctuating shallow-marine environment characterized by fluctuating energy conditions in which deposition alternated between just below and within wave base.
Compared to the Variku Formation, the Grasgard Siltstone is almost nondolomitic, more fossiliferous, and lacks claystone interbeds
The reservoir consists of quartz sandstone including interbeds
of siltstone and shale (claystone).
The conglomerate is notably massive and lacks bedding and interbeds
as viewed close to the outcrop.