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- John_Day_Formation abstract "The John Day Formation is a series of rock strata exposed in the Picture Gorge district of the John Day River basin and elsewhere in north-central Oregon in the United States. The Picture Gorge exposure lies east of the Blue Mountain uplift, which cuts southwest–northeast through the Horse Heaven mining district northeast of Madras. Aside from the Picture Gorge district, which defines the type, the formation is visible on the surface in two other areas: another exposure is in the Warm Springs district west of the uplift, between it and the Cascade Range, and the third is along the south side of the Ochoco Mountains. All three exposures, consisting mainly of tuffaceous sediments and pyroclastic rock rich in silica, lie unconformably between the older rocks of the Clarno Formation below and Columbia River basalts above.The strata, which vary in age from 39 million years to 18 million years, were formed mainly from ashfalls from volcanoes to the west. Some of the major layers within the group exposed in the Picture Gorge district are the Big Basin Formation and Bridge Creek Beds (35 to 32 million years), the Turtle Cove Formation (30 to 28 million years), the Picture Gorge Ignimbrite (28.7 million years), the Kimberly Formation (28 to 25 million years), and the Haystack Formation (25 to 18 million years).Located in the general vicinity of what became the Cascade Range, the John Day volcanoes emitted large volumes of ash and dust, much of which settled in the John Day basin. The rapid deposition of the ash preserved the remains of plants and animals living in the region. Some of the solidified ash and the fossils they contain are found in the John Day Fossil Beds National Monument. Because ash and other debris fell during varied climatic and volcanic conditions and accumulated from many eruptions extending into the early Miocene (about 20 million years ago), the sediment layers in the fossil beds vary in their chemical composition and color. The lowermost layer contains red ash, such as that exposed in the Painted Hills Unit of the national monument. The layer above it is mainly pea-green clay. On top of the pea-green layer are buff-colored layers.Fossils found in the John Day Formation include a wide variety of plants and more than 100 species of mammals, including dogs, cats, oreodonts, horses, camels, and rodents. Among the notable plant fossils are Metasequoia (Dawn Redwood), a genus thought to have gone extinct worldwide until it was discovered alive in China in the early twentieth century.".
- John_Day_Formation thumbnail Blue_basin_lower_trail.jpg?width=300.
- John_Day_Formation wikiPageID "7798259".
- John_Day_Formation wikiPageLength "5037".
- John_Day_Formation wikiPageOutDegree "28".
- John_Day_Formation wikiPageRevisionID "658847419".
- John_Day_Formation wikiPageWikiLink Blue_Mountains_(Pacific_Northwest).
- John_Day_Formation wikiPageWikiLink Cascade_Range.
- John_Day_Formation wikiPageWikiLink Category:Neogene_geology_of_Oregon.
- John_Day_Formation wikiPageWikiLink Central_Oregon.
- John_Day_Formation wikiPageWikiLink Columbia_River_Basalt_Group.
- John_Day_Formation wikiPageWikiLink Genus.
- John_Day_Formation wikiPageWikiLink Horse_Heaven,_Oregon.
- John_Day_Formation wikiPageWikiLink John_Day_Fossil_Beds_National_Monument.
- John_Day_Formation wikiPageWikiLink John_Day_River.
- John_Day_Formation wikiPageWikiLink Madras,_Oregon.
- John_Day_Formation wikiPageWikiLink Merycoidodontoidea.
- John_Day_Formation wikiPageWikiLink Metasequoia.
- John_Day_Formation wikiPageWikiLink Miocene.
- John_Day_Formation wikiPageWikiLink Ochoco_Mountains.
- John_Day_Formation wikiPageWikiLink Oligocene.
- John_Day_Formation wikiPageWikiLink Oregon.
- John_Day_Formation wikiPageWikiLink Pyroclastic_rock.
- John_Day_Formation wikiPageWikiLink Sandstone.
- John_Day_Formation wikiPageWikiLink Silicon_dioxide.
- John_Day_Formation wikiPageWikiLink Tuff.
- John_Day_Formation wikiPageWikiLink Type_site.
- John_Day_Formation wikiPageWikiLink Unconformity.
- John_Day_Formation wikiPageWikiLinkText "John Day Formation".
- John_Day_Formation wikiPageWikiLinkText "John Day Strata".
- John_Day_Formation age "Oligocene, lower Miocene".
- John_Day_Formation caption "Exposures of the Turtle Cove Formation along a hiking trail in the Sheep Rock Unit of the John Day Fossil Beds National Monument".
- John_Day_Formation country "United States".
- John_Day_Formation name "John Day Strata".
- John_Day_Formation namedfor John_Day_River.
- John_Day_Formation otherlithology Pyroclastic_rock.
- John_Day_Formation overlies John_Day_Fossil_Beds_National_Monument.
- John_Day_Formation prilithology Sandstone.
- John_Day_Formation prilithology Tuff.
- John_Day_Formation region Central_Oregon.
- John_Day_Formation type "sedimentary , igneous".
- John_Day_Formation underlies Columbia_River_Basalt_Group.
- John_Day_Formation wikiPageUsesTemplate Template:Infobox_rockunit.
- John_Day_Formation wikiPageUsesTemplate Template:Reflist.
- John_Day_Formation wikiPageUsesTemplate Template:Wide_image.
- John_Day_Formation subject Category:Neogene_geology_of_Oregon.
- John_Day_Formation hypernym Series.
- John_Day_Formation type TelevisionShow.
- John_Day_Formation type Formation.
- John_Day_Formation type Landform.
- John_Day_Formation comment "The John Day Formation is a series of rock strata exposed in the Picture Gorge district of the John Day River basin and elsewhere in north-central Oregon in the United States. The Picture Gorge exposure lies east of the Blue Mountain uplift, which cuts southwest–northeast through the Horse Heaven mining district northeast of Madras.".
- John_Day_Formation label "John Day Formation".
- John_Day_Formation sameAs Q3544958.
- John_Day_Formation sameAs John_Day_Formation.
- John_Day_Formation sameAs m.0h64_m3.
- John_Day_Formation sameAs Q3544958.
- John_Day_Formation wasDerivedFrom John_Day_Formation?oldid=658847419.
- John_Day_Formation depiction Blue_basin_lower_trail.jpg.
- John_Day_Formation isPrimaryTopicOf John_Day_Formation.