Jurassic Time Slices
Jurassic 1
Jurassic 1: Hettangian and Sinemurian (about 200-190 million years)
Jurassic 2: Pliensbachian through early Toarcian (about 190-179 million years)
Jurassic 3: Late Toarcian (about 179-176 million years)
Jurassic 4: Aalenian (about 176-172 million years)
Jurassic 5: early Bajocian (about 172-170 million years)
Jurassic 6: late Bajocian through early Callovian (about 170-164 million years)
Jurassic 7: middle Callovian through early Oxfordian (about 164-160 million years)
Jurassic 8: middle Oxfordian through Kimmeridgian (about 160-151 million years)
Jurassic 9: early Tithonian (about 151-149 million years)
Jurassic 10: middle and late Tithonian (about 149-145 million years)