| 词条 | Cheuquemó Formation |
| 释义 |
| name = Cheuquemó Formation | image = | caption = | type = | period = Miocene | age = Late Oligocene–Early Miocene | prilithology = Conglomerate, sandstone, mudstone, tuff | otherlithology = Coal | namedfor = | namedby = Floreal García, 1968 | region = Los Lagos Region | country = {{CHL}} | coordinates = | unitof = Osorno–Llanquihue Basin | subunits = | underlies = Santo Domingo Formation | overlies = Bahía Mansa Metamorphic Complex | thickness = more than {{convert|1200|m|ft|abbr=on}} | extent = | area = | map = | map_caption = }}Cheuquemó Formation ({{lang-es|Formación Cheuquemó}}) is a geological formation of sedimentary rock in south-central Chile. The sediments of the formation were deposited during the Late Oligocene and Early Miocene epochs. The formations lower sections are made up of conglomerate, then successions of sandstone, tuff and mudstone rich in organic material follows. The formation indicates that sedimentation occurred in a estuarine (paralic) and other non-marine (continental) environments. It contains fossils of the following genera: Mytilus, Cardium and Turritella. Stratigraphically it overlies the Bahía Mansa Metamorphic Complex and underlies the Miocene Santo Domingo Formation.[1] DescriptionThe formation is very similar to the Pupunahue Beds found further north, with the sole difference that the fossil assemblage in both seem to indicate different ages. While Cheuquemó is possibly about 14 million years old (Miocene), the Pupunahue Beds are 35–25 million years old.[2] See also{{portal|Chile|Geology|Neogene|Paleogene}}
References1. ^{{cite book| author-last=Elgueta |author-first=Sara| author-last2=Le Roux |author-first2=Jacobus | author-last3=Duhart |author-first3=Paul|date=2000 | author-last4=McDonough|author-first4=Michael | author-last5=Urqueta|author-first5=Esteban |title=Estratigrafía y sedimentología de la cuencas terciarias de la Región de Los Lagos (39-41°30’S)|language=Spanish|publisher=Servicio Nacional de Geología y Minería|pages= 15–16| place = Santiago, Chile| ISSN = 0020-3939}} {{Geology of Chile}}{{DEFAULTSORT:Cheuquemo Formation}}2. ^{{cite conference |url= |title=El yacimiento de carbón Catamutún (La Unión) |last1=Alfaro |first1=G.|last2=Gantz |first2=E.|last3=Magna |first3=O.|date=1990 |publisher=Departamento de Geociencias, Facultad de Ciencias, Universidad de Concepción |book-title=Actas |pages=11–28 |location=Santiago, Chile |conference=Segundo Simposio sobre el Terciario de Chile |id= |language=Spanish}} 12 : Geologic formations of Chile|Miocene Series of South America|Oligocene Series of South America|Paleogene Chile|Neogene Chile|Conglomerate formations|Sandstone formations|Mudstone formations|Coal formations|Coal in Chile|Tuff formations|Geology of Los Lagos Region |
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