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Coniacian

Period
The Coniacian is an age or stage in the geologic timescale. It is a subdivision of the Late Cretaceous Epoch or Upper Cretaceous Series and spans the time between 89.8 ± 1 Ma and 86.3 ± 0.7 Ma. The Coniacian is preceded by the Turonian and... Wikipedia
Occurred: 89.8 (+/- 0.3) million years ago - 86.3 (+/- 0.5) million years ago
Lower boundary definition: FAD of the Inoceramid Bivalve Cremnoceramus deformis erectus
Lower boundary GSSP: Salzgitter-Salder quarry, Germany; 52°07′27″N 10°19′46″E / 52.1243°N 10.3295°E
Lower GSSP ratified: May 2021
Fossils: AMNH 1571 and FHSM VP-2297