The Latah Formation is a series of late Miocene lacustrine sedimentary deposits which outcrop in eastern Washington and northwestern Idaho. The lake beds are interbedded with igneous rock of the Columbia River Basalt Group. The formation was originally detailed from a site in Spokane, Washington by Dr. Kirk Bryan in a 1923 talk, and then formally described in a 1926 journal article by Joseph Pardee and Bryan. When first described the formation was thought to have predated the deposition of the Columbia River Basalts, however further investigation showed them to be interbedded, being laid down in successive events. Potassium-argon dating of the formation returned an age range of 21.3 to 12.1 million years old, indicating an Early to Middle Miocene age range. Numerous fossil plants and insec
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| - Formazione Latah (it)
- Latah Formation (en)
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| - The Latah Formation is a series of late Miocene lacustrine sedimentary deposits which outcrop in eastern Washington and northwestern Idaho. The lake beds are interbedded with igneous rock of the Columbia River Basalt Group. The formation was originally detailed from a site in Spokane, Washington by Dr. Kirk Bryan in a 1923 talk, and then formally described in a 1926 journal article by Joseph Pardee and Bryan. When first described the formation was thought to have predated the deposition of the Columbia River Basalts, however further investigation showed them to be interbedded, being laid down in successive events. Potassium-argon dating of the formation returned an age range of 21.3 to 12.1 million years old, indicating an Early to Middle Miocene age range. Numerous fossil plants and insec (en)
- La formazione Latah (in lingua inglese: Latah Formation) è una formazione geologica costituita da una serie di depositi sedimentari lacustri risalenti al Miocene, che affiorano nella parte orientale dello Stato di Washington e nella parte nordoccidentale dell'Idaho. Gli strati di origine lacustre sono intersecati dalle rocce magmatiche del Gruppo basaltico del Columbia. La formazione si estende per 282 km in lunghezza, con una larghezza di 121 km. (it)
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| - Early to Middle Miocene (en)
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| - The Latah Formation is a series of late Miocene lacustrine sedimentary deposits which outcrop in eastern Washington and northwestern Idaho. The lake beds are interbedded with igneous rock of the Columbia River Basalt Group. The formation was originally detailed from a site in Spokane, Washington by Dr. Kirk Bryan in a 1923 talk, and then formally described in a 1926 journal article by Joseph Pardee and Bryan. When first described the formation was thought to have predated the deposition of the Columbia River Basalts, however further investigation showed them to be interbedded, being laid down in successive events. Potassium-argon dating of the formation returned an age range of 21.3 to 12.1 million years old, indicating an Early to Middle Miocene age range. Numerous fossil plants and insects have been recovered from the formation and described. The Latah Formation includes the Clarkia fossil beds in Idaho. (en)
- La formazione Latah (in lingua inglese: Latah Formation) è una formazione geologica costituita da una serie di depositi sedimentari lacustri risalenti al Miocene, che affiorano nella parte orientale dello Stato di Washington e nella parte nordoccidentale dell'Idaho. Gli strati di origine lacustre sono intersecati dalle rocce magmatiche del Gruppo basaltico del Columbia. La formazione si estende per 282 km in lunghezza, con una larghezza di 121 km. La denominazione della formazione, collegata a un sito della città di Spokane nello Stato di Washington, fu assegnata nel 1923 dal geologo statunitense Kirk Bryan. Nelle rocce della formazione Latah sono stati trovati e descritti numerosi insetti e piante fossili. Quando fu descritta per la prima volta, si pensava che la formazione Latah fosse precedente alla deposizione delle colate basaltiche del fiume Columbia; tuttavia ulteriori indagini mostrarono che le due formazioni si intersecavano e che la Latah era stata deposta in eventi successivi. Dalla datazione al potassio-argo risulta un intervallo di età compreso tra 21,3 e 12,1 milioni di anni, indicando un'origine risalente al Miocene inferiore e medio. (it)
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| - Pardee & Kirk Bryan, 1926 (en)
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