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| Subject | English | Russian |
| geol. | mid-Cretaceous | средний меловой (MichaelBurov) |
| geol. | mid-Cretaceous | среднемеловой (MichaelBurov) |
| geochron. | mid-Cretaceous | среднемеловой период (MichaelBurov) |
| geochron. | mid-Cretaceous | среднемеловая система (MichaelBurov) |
| stratigr. | mid-Cretaceous | среднемеловая система (MichaelBurov) |
| geol. | mid-Cretaceous | средний мел (MichaelBurov) |
| geol. | the mid-Cretaceous | середина мела (The mid-Cretaceous was a period characterized by a global greenhouse climate. ArcticFox) |