Baissa is a lower Cretaceous locality in Siberia, on the left bank of the Vitim River. The Zaza Formation sediments exposed at Baissa are represented mostly by sandstones, siltstones, marls and bituminous shales. The total thickness if the section is about 80 m. Insect remains occur throughout the section, except for the most coarse-grained rocks. Their abundance and state of preservation vary from one bed to another.

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