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History
Sinemurian
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In the geologic timescale, the Sinemurian is an age and stage in the Early or Lower Jurassic Epoch or Series. It spans the time between 199.5 ±0.3 Ma and 192.9 ±0.3 Ma. The Sinemurian is preceded by the Hettangian and is followed by the Pliensbachian.
Jurassic rock strata in the cliffs at East Quantoxhead, near the Sinemurian golden spike.
Jurassic rock strata in the cliffs at East Quantoxhead, near the Sinemurian golden spike.
Eteoderoceras armatum, a Sinemurian ammonite
Eteoderoceras armatum, a Sinemurian ammonite
Early Jurassic
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The Early Jurassic Epoch is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic–Jurassic extinction event, 201.3 Ma, and ends at the start of the Middle Jurassic 174.7 ±0.8 Ma.
Massive cliffs in Zion Canyon consist of Lower Jurassic formations, including (from bottom to top): the Kayenta Formation and the massive Navajo Sands
Massive cliffs in Zion Canyon consist of Lower Jurassic formations, including (from bottom to top): the Kayenta Formation and the massive Navajo Sandstone
Lias formations at Lyme Regis, UK, known locally as Blue Lias
Lias formations at Lyme Regis, UK, known locally as Blue Lias