( a. )
Consisting of a series of parallel cones, each made up of many concentric cones closely packed together; -- said of a kind of structure sometimes observed in sedimentary rocks.
( a. )
Consisting of a series of parallel cones, each made up of many concentric cones closely packed together; -- said of a kind of structure sometimes observed in sedimentary rocks.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012