دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a geologic epoch from today to 65 million years ago. Few major hydrocarbon bearing strata unless fluids have migrated to a trap from older source rocks.

a geological epoch from 38 million to 55 million years.

n: a division of geologic time;a subdivision of a geologic period.

a time division of geologic time next shorter than a period.

n: the long periods of time dealt with and identified by geology. Geologic time is divided into eras (usually Cenozoic, Mesozoic, Paleozoic, and Precambrian),which are subdivided into periods and epochs. When the age of a type of rock is determined, it is assigned a place in the scale and thereafter referred to as, for example, Mesozoic rock of the Triassic period.

an epoch of geologic time from present to 10,000 years ago.

an epoch of time from 5.3 to 25 million years ago.

an epoch in time from 25 to 28 million years ago.

a geologic time scale that is less than an era and greater than an epoch.

adj: 1. of or relating to the geologic epoch from about 2.5 million to 10 thou- sand years ago, the first part of the Quaternary period of the Cenozoic era, sometimes called the Ice Age, which extended from the end of the Tertiary period until the last re- treat of the northern continental ice sheets. 2. of or relating to the rocks or sediments formed during this epoch.