overall formations, geologic structures and local strata, calibrated by those layers which are widespread, a nearly complete geologic record has been constructed...

The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological...

The geologic temperature record are changes in Earth's environment as determined from geologic evidence on multi-million to billion (109) year time scales...

golden spikes on geologic timescales represent internationally agreed upon references for the boundaries of the stages in the geologic timescale. These...

deposition of all rocks within a geological region, and then to every region, and by extension to provide an entire geologic record of the Earth. A gap or missing...

or Early Carboniferous) is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earlier of two subperiods of the Carboniferous...

deposition. The local record for that time interval is missing and geologists must use other clues to discover that part of the geologic history of that area...

within the geologic record. Tephra is any sized or composition pyroclastic material produced by a explosive volcanic eruption and precise geological definitions...

study of biases in the paleontological record. Paleontology seeks to map out how life evolved across geologic time. A substantial hurdle is the difficulty...

years, or megaanni (Ma). The geologic record is the strata (layers) of rock in the planet's crust and the science of geology is much concerned with the...