Category:Valentine Formation
The Valentine Formation is a geological classification for the lowest strata of the Ogallala unit. The notable feature of this strata is the unique lenticular beds of greenish opal-cemented sandstone that form landmark bluffs in the central High Plains of North America and is quarried for construction material.
Formal use of this classification has been abandoned outside of Nebraska; however, the features of this material are observed and exploited throughout the region.
Subcategories
This category has the following 5 subcategories, out of 5 total.
Media in category "Valentine Formation"
The following 9 files are in this category, out of 9 total.
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Fossil wood (Valentine Formation, Miocene, 13-14 Ma; Ashfall Fossil Beds, Nebraska, USA).jpg 3,008 × 2,000; 3.56 MB
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Fossil wood (Valentine Formation, Miocene; Great Plains, USA) 1.jpg 3,008 × 1,748; 3.75 MB
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Fossil wood (Valentine Formation, Miocene; Great Plains, USA) 2.jpg 2,848 × 2,000; 3.62 MB
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Fossil wood (Valentine Formation, Miocene; Great Plains, USA) 3.jpg 2,787 × 2,000; 3.32 MB
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Fossil wood (Valentine Formation, Miocene; Great Plains, USA) 4.jpg 2,096 × 1,995; 2.82 MB
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Natural seeps PA120590.jpg 3,072 × 2,304; 1.47 MB
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Ogallala, Valentine, opaline sandstone, Hays, KS, Walmart 20200523 174044.jpg 3,654 × 2,306; 2.94 MB
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Ogallala, Valentine, opaline sandstone, Hays, KS, Walmart 20200523 174125.jpg 3,086 × 2,384; 2.54 MB
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Ogallala, Valentine, opaline sandstone, Rush County, KS 20200607 172321.jpg 4,032 × 3,024; 3.81 MB
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