2. Descriptive of, or pertaining to, geology or the science of the earth.
A science which deals with the history of the earth and its life; especially, as recorded in rocks.
2. A formal geologic unit of time which corresponds to a stage.
3. An informal geologic time unit that corresponds to any stratigraphic unit.
4. The fourth-order division of geologic time, which establishes the limits or boundaries of by very minor changes; usually, in sea level and/or climate or in the biota, and usually local.
This is limited to a single continent or a part of it.
Such erosion is primarily responsible for the present modifications of the land surfaces.
2. A specific layer, or stratum, of soil or subsoil in a vertical cross section of land.
3. A term used to describe an artifact, art style, or other such cultural trait which has extensive geographical distribution but a limited time span.
4. A thin bed or surface within a sedimentary sequence which represents a particular portion of geologic time and that is characterized by its distinctive fossil content or lithology.
Used in petroleum and mining engineering as well as geological surveys.
2. The representation of geological surfaces or subsurface features by means of signs and symbols and with indicated means of orientation.
It includes nature and distribution of rock units, and the occurrence of structural features, mineral deposits, and fossil localities.
A major demonstration of carbon dioxide injection into a saline formation for sequestration is under way at an offshore gas platform in the North Sea near Norway. Results from this project (and others) suggest that such formations will be reliable, long-term geologic sequestration (storage) sites or carbon dioxide reservoirs.
There are numerous natural carbon dioxide reservoirs throughout the Rocky Mountain states of the United States in geologic "domes" and "traps", suggesting these geological storage formations will be excellent for keeping carbon dioxide captured from industrial facilities.
2. A thermometer constructed to measure temperatures in boreholes to provide information about the temperature range within which minerals were developed.
2. The period of time that extends from the beginning of the world to the present day.
3. An interval of time occupied by the earth's geologic history, extending from about 3.9 billion years ago (corresponding to the age of the oldest known rocks) to the present day.
In other words, the part of the earth's history that is recorded in rock strata.
The geological time scale is classified in intervals distinguished by characteristic geological and biological features; as indicated by the following longest to the shortest durations: eon (one thousand million years), era (divided into several periods), period (unit of geological time during which a system of rocks is formed), and epoch (geologic time that is a subdivision of a period).