- Umumbotheca reticulatus
- Unaesporites
- Unatextisporites
- Unatextisporites mohrensis
- Unatextisporites mohri
- Unatextisporites sp
- Unatextisporites sp.1
- Unatextisporites sp.2
- Unatextisporites sp.3
- Unatextisporites sp.4
- Uncaria rhynchophylla
- Uncinisphaera
- Uncinisphaera acantha
- Uncinisphaera ceratioides
- Uncinisphaera imaguncula
- Uncinula sp. Mack.,1957
- Uncinulites
- Uncinulites artuziae
- Uncinulites baccarinii
- Uncinulites pezizaffinis
- Undosisphaera
- Undosisphaera pilosiuscula
- Undulatasporites
- Undulatasporites anguineus
- Undulatasporites araneus
- Undulatasporites bellhofensis
- Undulatasporites callosus
- Undulatasporites sp
- Undulatisporites
- Undulatisporites afirmatus