The formation comprising limestones, mudstones and marls was deposited in a shallow marine reefal environment and preserves many fossils dating back to the Ordovician period.

[1] The oldest calcareous microfossils, known as calcisphers or calcitarchs, were found in the Early Ordovician (Floian) strata of this formation.

Trilobites, gastropods and echinoderm Nuia sibiria have been collected from the same deposits.

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