( n. )
An extension of geological beds above and beyond others, as in a conformable series of beds, when the upper beds extend over a wider space than the lower, either in one or in all directions.
( n. )
An extension of geological beds above and beyond others, as in a conformable series of beds, when the upper beds extend over a wider space than the lower, either in one or in all directions.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012