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...

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 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...

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...

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

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

present and the magnetosphere was about half the modern radius. The geologic record of the Proterozoic (2,500 to 538.8 million years ago) is more complete...

more ephemeral or perennial streams. Alluvial fans are common in the geologic record, such as in the Triassic basins of eastern North America and the New...

A geologic province is a spatial entity with common geologic attributes. A province may include a single dominant structural element such as a basin or...

Alluvial fans likely contain the largest accumulations of gravel in the geologic record. These include conglomerates of the Triassic basins of eastern North...

is the longest and most severe known glacial event preserved in the geologic record after the much earlier Huronian glaciation. Ultimately, current usage...

fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages). Index fossils must have a short vertical range...

fans and likely contain the largest accumulations of gravel in the geologic record. Conglomerates may be named and classified by the: Amount and type...

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...

(2008). The Concise Geologic Time Scale. Cambridge University Press. p. 184. ISBN 978-0-521-89849-2. U.S. Geological Survey Geologic Names Committee (March...

extinct desert. There are at least 14 known unconformities in the geologic record found in the Grand Canyon. Uplift of the region started about 75 million...

often known as Quaternary geology, after the Quaternary period of geologic history, which is the most recent period of geologic time. Magma is the original...

supercontinent will form in that time frame. Beyond that, he cautions that the geologic record is full of unexpected shifts in the tectonic activity that make further...

reconstruct the geological history of Earth. Historical geology examines the vastness of geologic time, measured in billions of years, and investigates...

organisms and/or interactions between organisms and their environments across geologic timescales. As a discipline, paleoecology interacts with, depends on and...

Pangaea is the most recent supercontinent reconstructed from the geologic record and therefore is by far the best understood. The formation of supercontinents...

compositions of carbonate rocks show an uneven distribution in time in the geologic record. About 95% of modern carbonates are composed of high-magnesium calcite...

"A Geologic Valentine: Episode #1". The Geologic Podcast. Archived from the original on September 26, 2011. Retrieved September 30, 2012. "Geologic Podcast:...

supercontinent will form in that time frame. Beyond that, he cautions that the geologic record is full of unexpected shifts in tectonic activity that make further...

deposits, supervolcanoes can be difficult to identify in the geologic record without careful geologic mapping. Known examples include Yellowstone Caldera in...

a common geochemical proxy used to detect massive volcanism in the geologic record, although its foolproofness has been called into question. These LIPs...

affect the geology of the Earth comes from the Earth. The third rule is that celestial cycles do not impact the patterns of Earth's geologic record. Rule two...