In the geologic timescale, Hettangian is the lowermost or the earliest age of the Jurassic period. It is followed by Rhaetian ( part of the triassic system) and succeeded by Sinemurian. It lasted between 201.5 to 199.3 + 3 mya.


Its likely the earliest part of the Jurassic period was similar to the late Triassic landscape, though with more common forests. Water holes would likely be surrounded by conifers, horsetails, and other plants. Forests would likely consist of ferns and conifer trees.

Flora and Fauna[]

Plants were likely to be conifer trees and ferns. The fauna of the time directly after the Triassic-Jurassic boundary are shrouded in mystery, one of the best known dinosaurs of the time is Dilophosaurus. The whole earth was bathed in constant tropical heat.