411 REFERENCE · Wiktionary
Portlandian
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Portland Group (geology)
Etymology
From en Portland -ian. Named after the en Isle of Portland in Dorset where the strata are exposed and have been extensively worked.
Proper noun
en archaic geology The Tithonian stage or age, now considered strata about 150 million years old.