|
Gobbler Formation
The Gobbler Formation is a geologic formation in the Sacramento Mountains of New Mexico. It preserves fossils dating back to the Moscovian Age of the Pennsylvanian Period. Description The Gobbler Formation consists of a lower section of of quartz sandstone and limestone and an upper section of over of shales and quartz sandstones. The lower sandstone beds are well-sorted and the limestone includes black masses of chert. These beds intruded by sills possibly of Tertiary age. The upper beds interfinger with limestone assigned to the Bug Scuffle Limestone Member of the Gobbler Formation. The total thickness is . The formation overlies the Lake Valley Limestone, from which it is separated by a subaerial erosion surface with paleochannels as deep as The Gobbler Formation underlies the Beeman Formation. The Bug Scuffle Limestone Member contains parasequences thick whose uppermost beds show isotopic evidence of subaerial exposure. The formation is prominently exposed at Oliv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness (geology), thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
