Hettangian

== English == === Etymology === From French Hettange, now Hettange-Grande, a commune in northeastern France, (German Hettingen, Luxembourgish (Lorraine Franconian) Hetténgen). === Proper noun === Hettangian (geology, paleontology) The earliest age of the Jurassic period, from 199.3–201.3Ma The corresponding lowest stage of the Jurassic system, marked by the lowest strata in which the neoammonite genus Psiloceras appears. ==== Translations ==== === See also === Schlotheimia angulata Alsatites liasicus Psiloceras planorbis