sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies...
basically a continuation of the same unit. InGermany the Buntsandstein is subdivided into three subgroups with seven formations (from top to base): Upper...
whole. In contrast, extensive formations associated with large areas may be equivalently represented at many locations. Such formations may be listed either...
Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur...
type of wheat Krummholz, crooked or bent wood due to growth conditions of trees and bushes Lagerstätte, repository; sedimentary deposit rich in fossils...
of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary...
transgressions and regressions. Ideally, a sedimentary facies is a distinctive rock unit that forms under certain conditions of sedimentation, reflecting a particular...
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains, cemented together by another mineral. Sandstones...
unconformity. The formation reaches a total sedimentary thickness of more than 110 metres (360 ft). The formation ranges in age from the late Middle Jurassic to...
Paleontology portal History of science portal This listof fossil arthropods described in 2018 is a listof new taxa of trilobites, fossil insects, crustaceans...
sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). Chert is characteristically of...
Sedimentary exhalative deposits (SEDEX or SedEx deposits) are zinc-lead deposits originally interpreted to have been formed by discharge of metal-bearing...
Tufa is common in many parts of the world including: Pyramid Lake, Nevada, US – tufa formations Big Soda Lake, Nevada, US – tufa formations only a century...
Zechstein (German either from mine stone or tough stone) is a unit ofsedimentary rock layers of Late Permian (Lopingian) age located in the European...
classifications focuses partly on the size ofsedimentary particles (sandstone and shale), and partly on mineralogy and formation processes (carbonation and evaporation)...
limestone – Type of limestone with hard fine grain Oolite – Sedimentary rock formed from ooids Rag-stone – Work done with stones that are quarried in thin pieces...
The Graves and Sauternes regions of Bordeaux consist predominantly of gravel-based soil. Greywacke – Sedimentary soil formed by rivers depositing quartz...
The Fernie Formation is a stratigraphic unit of Jurassic age. It is present in the western part of the Western Canada Sedimentary Basin in western Alberta...
common in the sandstones and conglomerates. The sandstones and conglomerates make up approximately 30% of the formation. This sedimentary rock formation is...
In addition, there are isolated theropod teeth disputedly assigned to dromaeosaurids, or to abelisaurids. Listof dinosaur-bearing rock formations Catuneanu...
volcanism is the cause of the formationof a small basin, not the sedimentary filling. Of this type are the sites of Messel (Germany), with abundant and...
rocks, composed of strongly folded and faulted sedimentary units. These forms are disturbed by dikes and small beaches. This promontory of "high" beaches...
Dharmaram Formation is a sedimentary rock formation found in Andhra Pradesh, India. It is one of the formationsof the Pranhita–Godavari Basin. It is of latest...
and Enbekshikazakh District in the Almaty Region. The canyon features many formations formed by the weathering ofsedimentary rock. Though it is much smaller...
although high in silica (>65 wt%), the bulk chemical and isotopic composition of tektites is closer to those of shales and similar sedimentary rocks and quite...
sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic...
Travertine is a sedimentary rock formed by the chemical precipitation of calcium carbonate minerals from fresh water, typically in springs, rivers, and...