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Clash Royale CLAN TAG #URR8PPP The fundamental unit of lithostratigraphy This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations . Please help to improve this article by introducing more precise citations. (November 2013) (Learn how and when to remove this template message) A geologic cross section of the Grand Canyon. Black numbers correspond to groups of formations and white numbers correspond to formations (click on picture for more information). A formation or geological formation is the fundamental unit of lithostratigraphy. A formation consists of a certain amount of rock strata that have a comparable lithology, facies or other similar properties. Formations are not defined by the thickness of their rock strata; therefore the thickness of different formations can vary widely. The concept of formally defined layers or strata is central to the geologic discipline of stratigraphy. Groups of...

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Clash Royale CLAN TAG #URR8PPP Rock consolidated from volcanic ash For other uses, see Tuff (disambiguation). Etruscan tuff blocks from a tomb at Banditaccia Welded tuff from Bandelier National Monument, New Mexico Tuff (from the Italian tufo ), also known as volcanic tuff , is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is compacted into a solid rock in a process called consolidation. Tuff is sometimes [ when? ] erroneously called [ by whom? ] "tufa", particularly when used as construction material, but properly speaking, tufa is a limestone precipitated from groundwater. Rock that contains greater than 50% tuff is considered tuffaceous. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Since it is common in Italy, the Romans used it often for construction. The Rapa Nui people used it to make most of the moai statues in Easter Island. Tuff can be cl...

Clash Royale CLAN TAG #URR8PPP   本文介紹的是河南洛陽市。關於洛陽的其他含义，請見「 洛阳 (消歧义) 」。 body.skin-minerva .mw-parser-output table.infobox captiontext-align:center 洛阳市 洛阳市风光：从上方顺时针起：龙门石窟 、洛阳牡丹 、龙门大桥、白马寺 简称 洛 别称 京洛、伊洛、洛城、神都 旧稱 斟鄩、西亳、洛邑、雒邑、成周、王城、三川郡、河...