Hettangian


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Hettangian

[he′tan·jē·ən]
(geology)
A stage of Lower Jurassic geologic time.
References in periodicals archive ?
Contract notice: Hydrogeological study of karsts and hettangian urgonien.
Geology of Hettangian to Middle Eocene Rocks of Hazara and Kashmir Basins, Northwest Lesser Himalayas, Pakistan" PU Geol.
TS IV conformably overlies TS III and consists of the late Rhaetian top member of the Blomidon Formation and (overlying the North Mountain Basalt) the McCoy Brook Formation, which is of latest Rhaetian to Hettangian (and possibly younger) age.
Geology Of Hettangian to middle Eocene rocks of Hazaraand Kashmir basins, Northwest lesserHimalayas, Pakistan.
study to improve understanding of how the hydro-als Galeizon compartments Hettangian karst one hand, and the compartment st chaptes basin karst urgonian, assess the role played by karst during low water on roach (definition and quantification of losses and resurgences of karstic systems) and evaluate the impact of the levies in the karsts on the flow of roach and flow during low water resurgences: Literature Review, collecting existing data, implementation of piezometers, gauging, physicochemical analyzes, plots, etc.
First, they contain the only currently known example of tightly temporally constrained latest Rhaetian and earliest Hettangian assemblages of continental tetrapods with associated radiometric ages anywhere.
3), which consists of a 100 m thick dolomitic (partly brecciated) sequence that has been dated to the Hettangian (Aurell et al, 2000).
Precise U-Pb age constraints for end-Triassic mass extinction; its correlation to volcanism and Hettangian post-extinction recovery.
Precise U-Pb age constraints for end-Triassic mass extinction, its correlation to volcanism and Hettangian post-extinction recovery.