Lewisian
/ljuːˈɪsɪən/adjective
1- Geology of, relating to, or denoting the earlier stage of the Proterozoic aeon in NW Scotland, from about 2,500 to 1,100 million years ago, when the oldest rocks in Britain were deposited【地质】路易斯代的。
1.1
- as noun the Lewisian the Lewisian stage or the system of rocks deposited during it路易斯代; 路易斯代沉积的岩石系。
词源
mid 19th cent.: from the name of the Island of Lewis in the Outer Hebrides (where the chief outcrops of these rocks are found) + -IAN.