Search results
Results from the WOW.Com Content Network
Biostratigraphy is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them. [1] The primary objective of biostratigraphy is correlation , demonstrating that a particular horizon in one geological section represents the same period of time as another ...
A gap or missing strata in the geological record of an area is called a stratigraphic hiatus. This may be the result of a halt in the deposition of sediment. Alternatively, the gap may be due to removal by erosion, in which case it may be called a stratigraphic vacuity. [2] [3] It is called a hiatus because deposition was on hold for a period ...
Stratigraphy is a key concept to modern archaeological theory and practice. Modern excavation techniques are based on stratigraphic principles. The concept derives from the geological use of the idea that sedimentation takes place according to uniform principles.
A flute cast, one of many sedimentary structures found in the Book Cliffs. The Book Cliffs are one of the world's best places to study sequence stratigraphy.In the 1980s, Exxon scientists used the Cretaceous strata of the Book Cliffs to develop the science of sequence stratigraphy.
An interval zone is defined as the body of strata between two bio-horizons, which are arbitrarily chosen. For example, a highest-occurrence zone is a biozone with the upper boundary being the appearance of one taxon, and the lower boundary the appearance of another taxon.
Buda Limestone stratigraphic column in Texas. The Buda Limestone is a geological formation in the High Plains and Trans-Pecos regions of West Texas [1] and in southern New Mexico, [2] whose strata date back to the Late Cretaceous. Pterosaur remains are among the fossils that have been recovered from the formation. [3]
The Hell Creek Formation is an intensively studied division of mostly Upper Cretaceous and some lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. [1]
The Glen Canyon Group is a geologic group of formations that is spread across the U.S. states of Nevada, Utah, northern Arizona, north west New Mexico and western Colorado.It is called the Glen Canyon Sandstone in the Green River Basin of Colorado and Utah.