English regional. A part of an underlying stratum, esp. of marl, seen protruding through an overlying one. Obsolete.
| 单词 | θ5029 |
| 释义 | the world > the earth > structure of the earth > structural features > [noun] > formation (13) head1686 English regional. A part of an underlying stratum, esp. of marl, seen protruding through an overlying one. Obsolete. formation1815 Geology. (See quots.) Subcategories:— character of (2) — by origin in place (4) — direction (1) — relative time (2) — identity of formations having different names (2) |
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