دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the oldest terrain from the Cretaceous period.

n: The powder manufactured by bucking cretaceous lump. Usually used for heavy weight additive of drill fluid.

ad}: of or relating to the geologic period from about 135 million to 65 million years ago at the end of the Mesozoic era, or to the rocks formed during this period, including the extensive chalk deposits for which it was named.

a geological time from 65 million to 140 million years ago.

n: any of the algae of the class Bacillariophyceae, noted for symmetrical and sculptured siliceous cell walls. After death, the cell wall persists and forms diatomite. Diatoms first appeared in the Cretaceous period and still live today.

n: an ancient great ocean of the Cretaceous period, 135 million to 65 million years ago, between Eurasia and Africa. More than half the worlds known petroleum accumulated along the margins of this ocean during a brief (30 million-year) interval.