On the question of the microstructure of oolitic limestones

While examining the petrographic material that I collected in 1914 during geological research in the Middle Vitim mountainous country, I came across specimens among limestone samples in which well-preserved oolitic deposits could be observed under a microscope, only partly masked by subsequent recrystallization. The significant interest represented by the discovery of oolitic formations among the metamorphic rocks of the Vitim Plateau prompted me to familiarize myself in more detail with the oolitic structure on material where the primary structure would not be obscured by secondary changes.