Portlandian

(=Portlandian stage)[地质]波特兰阶

释义与例句

name
  1. 1.

    The Tithonian stage or age, now considered strata about 150 million years old.

    古体 地质

词源

From Portland + -ian. Named after the Isle of Portland in Dorset where the strata are exposed and have been extensively worked.

来源：wiktionary