hettangian

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Proper noun

1. {{lb|en|geology|paleontology}} The earliest age of the Jurassic period, from 199.3–201.3Ma
2. The corresponding lowest stage of the Jurassic system, marked by the lowest strata in which the [[neoammonite]] genus {{taxfmt|Psiloceras|genus}} appears.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.