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| name = Fort Payne Chert ...]</ref> It is a [[Mississippian (geologic period)|Mississippian Period]] [[chert]]y [[limestone]], that overlies the [[Chattanooga Shale]] (or locally the [ ...

| otherlithology = [[Shale]], [[chert]]<ref name=Howe>Howe, W. B. and J. W. Koenig, ''The Stratigraphic Section i | subunits = [[Dover Chert]], [[Horse Cave Member]], [[Sisson Member]] ...

| otherlithology = [[Sandstone]], [[chert]]<ref name=Howe>Howe, W. B. and J. W. Koenig, ''The Stratigraphic Section i [[Category:Limestone formations of the United States]] ...

...Iron Formation is overlain by "[[brecciated]] and complexly deformed iron formations", which in turn is overlain by ejecta from the "[[Sudbury Basin|Sudbury met The [[chert]]s of the Gunflint (the [[Gunflint Chert]]) are noted for containing [[Precambrian]] [[microfossil]]s. ...

...uril Islands|Kurile Island Arc]] and the [[Northeastern Japan Arc]]. Three formations make up the Yūbari mountains:<ref name="GLGarcs">{{cite web|url=http://www. ...rpentine]] and rocks of the Sorachi Group. The Sorachi Group consists of [[chert]], [[greenschist]], [[micrite]] [[limestone]], and [[sandstone]] with [[fel ...

...[shale]] layers. Mississippian limestones are generally thicker and more [[chert]]y than those of the Ordovician, and additionally. In the Ordovician, the [ ...ne.jpg|thumb|300px|Level of the ocean drops over millennia creating recent formations]] ...

...cession (geology)|geological succession]] up from sea level is: Portland [[chert|Cherty]] Series (up to the level of the neighbouring quarried platform), th * [[List of rock formations in the United Kingdom]] ...

| otherlithology =[[Chert]] | overlies = [[Helderberg Group]], [[Huntersville Chert]], [[Old Port Formation]], [[Oriskany Sandstone]], and [[Schoharie Formatio ...

...ses on to the Middle and Lower Chalk, and in [[Devon]], it is found on the Chert-Beds of the Selbornian group.{{sfn|Howe|1911|p=475}}<ref>A. J. Jukes-Browne [[Category:Geologic formations of the United Kingdom]] ...

...water table) and passages have elliptical cross-sections typical of these formations. During the cave's development, active streams have been pirated from one l ...tour route in the uppermost level of the cave spans three units, the Boone Chert, Cason Shale and the Fernvale Limestone.<ref name="usacaves" /> ...

| name = Gunflint chert ..., Gunflint Formation, north shore of Lake Superior, 1.9 billion years old, chert - Redpath Museum - McGill University - Montreal, Canada - DSC07897.jpg ...

...rous limestone]], [[sand]]y limestone, [[Dolomite (rock)|dolomite]], and [[chert]]<ref name="ConnorsOthers2020a">Connors, T.B., Tweet, J.S., and Santucci, V ...f, J. E. and G. H. Billingsley, 1991, ''Members of the Toroweap and Kaibab Formations, Lower Permian, northern Arizona and southwestern Utah.'' The Mountain Geol ...

...ful information. There are only two locations in the world containing rock formations that are intact enough to preserve evidence of early life: the [[Kaapvaal c The [[Strelley Pool|Strelley Pool Chert]], also located in the Pilbara Craton, contains [[Stromatolite|stromatolite ...

...is customarily restricted to hard, coarsely banded, non-banded, and non-[[chert]]y sedimentary rocks of [[Phanerozoic|post-Precambrian]] age. The [[Precamb ...

...hmidt (1997) ''Paleomagnetism of the Paleoproterozoic Gowganda and Lorrain formations, Ontario: low paleolatitude for Huronian glaciation.'' Earth and Planelary ...

|name=Chert |alt=Chert hand sample ...

| otherlithology = [[evaporite]]s, [[chert]] ...ions, with them only recognizing five members of the Lulworth and Durlston Formations, each encompassing multiple of the Beds of earlier studies.<ref name="ensom ...

...ng Coron).jpg|thumb|left|Highly-deformed bedded cherts of the Liminangcong chert, exposed in the town of Coron, Busuanga Island]] ...Island, the third-largest, features steep [[limestone]] cliffs, [[karst]] formations, mangrove forests, and eleven inland lakes.<ref name=":0">{{cite web |last= ...

...ert]] and [[Ritito Conglomerate]], which are relatively young [[geological formations]]. These reveal the geologic history of this part of the Nacimiento Uplift, ...

...Tyler|last4=Fleagle|first4=John G.}}</ref> Omo Kibish and the neighboring formations ([[Shungura Formation|Shungura]] and [[Usno Formation|Usno]]) have produced ...lity fine-grained cryptocrystalline silicate raw materials such as jasper, chert, chalcedony comprise the clear majority (60-90% ) across all sites. Given t ...