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Middle Jurassic

Period
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The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 161.5 million years ago. Wikipedia
Period: Jurassic
Occurred: 174.1 (+/- 1) million years ago - 163.5 (+/- 1) million years ago
Ages: Aalenian, Bajocian, Bathonian, and more
Fossils: OUM J13505
Lower boundary definition: FAD of the Ammonites Leioceras opalinum and Leioceras lineatum
Lower boundary GSSP: Fuentelsaz, Spain; 41°10′15″N 1°50′00″W / 41.1708°N 1.8333°W
Lower GSSP ratified: 2000