Nacientes del Biobío Formation (Spanish: "Formación Nacientes del Biobío" ) is a geological formation that crops out near the uppermost reaches of Bío Bío River, in south-central Chile, and nearby areas of Argentina.
 The formation is made up of basalt and pyroclastic rocks and marine sedimentary rocks such as sandstone, mudstone.
 Some less abundant sedimentary lithologies are conglomerate, volcaniclastic sedimentary rock.
 The formation is intruded by "Grupo Plutónico Galletué" which is of Late Jurassic to Late Cretaceous age.
 Further north in Chile the formation is similar to Nacientes del Teno Formation while in Argentina it is similar to Los Molles Formation and Lotena Formation.
The Alps ( ; French: "Alpes" ] ; German: "Alpen" ] ; Italian: "Alpi" ] ; Romansh: "Alps" ; Slovene: "Alpe" ] ) are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately 1,200 km across eight Alpine countries: Austria, France, Germany, Italy, Liechtenstein, Monaco, Slovenia, and Switzerland.
 The mountains were formed over tens of millions of years as the African and Eurasian tectonic plates collided.
 Extreme shortening caused by the event resulted in marine sedimentary rocks rising by thrusting and folding into high mountain peaks such as Mont Blanc and the Matterhorn.
 Mont Blanc spans the French–Italian border, and at 4810 m is the highest mountain in the Alps.
 The Alpine region area contains about a hundred peaks higher than 4000 metres (just over 13,000 feet).
Iron-rich sedimentary rocks are sedimentary rocks which contain 15% or more iron.
 However, most sedimentary rocks contain iron in varying degrees.
 The majority of these rocks were deposited during specific geologic time periods: The Precambrian (3800 to 570 million years ago), the early Paleozoic (570 to 410 million years ago), and the middle to late Mesozoic (205 to 66 million years ago).
 Overall, they make up a very small portion of the total sedimentary record.
Sedimentary organic matter includes the organic carbon component of sediments and sedimentary rocks.
 The organic matter is usually a component of sedimentary material even if it is present in low abundance (usually lower than 1%).
 Petroleum (or oil) and natural gas are particular examples of "sedimentary organic matter".
 Coals and bitumen shales are examples of sedimentary rocks rich in "sedimentary organic matter".
In geology, a key bed ("syn" marker bed) is a relatively thin layer of sedimentary rock that is readily recognized on the basis of either its distinct physical characteristics or fossil content and can be mapped over a very large geographic area.
 As a result, a key bed is useful for correlating sequences of sedimentary rocks over a large area.
 Typically, key beds were created as the result of either instantaneous events or (geologically speaking) very short episodes of the widespread deposition of a specific types of sediment.
 As the result, key beds often can be used for both mapping and correlating sedimentary rocks and dating them.
 Volcanic ash beds (tonsteins and bentonite beds) and impact spherule beds, and specific megaturbidites are types of key beds created by instantaneous events.
 The widespread accumulation of distinctive sediments over a geologically short period of time have created key beds in the form of peat beds, coal beds, shell beds, marine bands, black shales in cyclothems, and oil shales.
 A well-known example of a key bed is the global layer of iridium-rich impact ejecta that marks the Cretaceous–Paleogene boundary (K–T boundary).
Organic-rich sedimentary rocks are a specific type of sedimentary rock that contains significant amounts (>3%) of organic carbon.
 The most common types include coal, lignite, oil shale, or black shale.
 The organic material may be disseminated throughout the rock giving it a uniform dark color, and/or may be present as discrete occurrences of tar, bitumen, asphalt, petroleum, coal or carbonaceous material.
 Organic-rich sedimentary rocks may act as source rocks which generate hydrocarbons that accumulate in other sedimentary "reservoir" rocks (see oil sands and petroleum geology).
 Potential source rocks are any type of sedimentary rock that the ability to dispel available carbon from within it (limestone is a classic example of a source rock).
 Good reservoir rocks are any sedimentary rock that has high pore-space availability.
 This allows the hydrocarbons to accumulate within the rock and be stored for long periods of time (a sandstone commonly makes a good source rock).
 Highly permeable reservoir rocks are also of interest to industry professionals, as they allow for the easy extraction of the hydrocarbons within.
 The hydrocarbon reservoir system is not complete however without a "cap rock".
 Cap rocks are rock units which have very low porosity and permeability, which trap the hydrocarbons within the units below as they try to migrate upwards.
Huangling Complex represents a group of rock units appear in the middle of Yangtze Block in South China, distributed across Yixingshan, Zigui, Huangling and Yichang counties.
 The group of rock involves nonconformity that sedimentary rocks overlie the metamorphic basement.
 It is a 73-km long, asymmetrical dome-shaped anticline with axial plane orientating in north-south direction.
 It has a steeper west flank and a gentler east flank.
 Basically, there are three tectonic units from the anticline core to the rim, including Archean to Paleoproterozoic metamorphic basement, Neoproterozoic to Jurassic sedimentary rocks and Cretaceous fluvial deposit sedimentary cover.
 The northern part of the core is mainly tonalite-trondhjemite-gneiss (TTG) and Cretaceous sedimentary rock, it is called the Archean Kongling Complex.
 The middle of the core is mainly the Neoproterozoic granitoid.
 The southern part of the core is the Neoproterozoic potassium granite.
 Two basins are situated on the western and eastern flanks of the core respectively, including the Zigui basin and Dangyang basin.
 Both basins are synforms while Zigui basin has a larger extent of folding.
 Yuanan Graben and Jingmen Graben are found within Dangyang Basin area.
 Huangling Complex is an important area that helps unravel the tectonic history of South China Craton because it has well-exposed layers of rock units from Archean basement rock to Cretaceous sedimentary rock cover due to the erosion of the anticline.
The geology of the Appalachians dates back to more than 480 million years ago.
 A look at rocks exposed in today's Appalachian Mountains reveals elongate belts of folded and thrust faulted marine sedimentary rocks, volcanic rocks and slivers of ancient ocean floor - strong evidence that these rocks were deformed during plate collision.
 The birth of the Appalachian ranges marks the first of several mountain building plate collisions that culminated in the construction of the supercontinent Pangaea with the Appalachians and neighboring Little Atlas (now in Morocco) near the center.
 These mountain ranges likely once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded.
In geology, basement and crystalline basement are the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin.
 In the same way, the sediments or sedimentary rocks on top of the basement can be called a "cover" or "sedimentary cover".
The Matterhorn (German: Matterhorn , ] ; Italian: Cervino , ] ; French: Le Cervin , ] ) is a mountain of the Alps, straddling the main watershed and border between Switzerland and Italy.
 It is a large, near-symmetrical pyramidal peak in the extended Monte Rosa area of the Pennine Alps, whose summit is 4478 m high, making it one of the highest summits in the Alps and Europe.
 The four steep faces, rising above the surrounding glaciers, face the four compass points and are split by the "Hörnli", "Furggen", "Leone", and "Zmutt" ridges.
 The mountain overlooks the Swiss town of Zermatt, in the canton of Valais, to the north-east and the Italian town of Breuil-Cervinia in the Aosta Valley to the south.
 Just east of the Matterhorn is Theodul Pass, the main passage between the two valleys on its north and south sides, and a trade route since the Roman Era.

Question: Which mountain in the Alps between Switzerland and Italy was created by marine sedimentary rocks folding into mountain peaks?
Answer: Matterhorn