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Poleta formation : ウィキペディア英語版 | Poleta formation
The Poleta formation is a geological unit known for the exceptional fossil preservation in the Indian Springs Lagerstätte, located in eastern California and Nevada. == Occurrence ==
The formation dates to the Stage 3 of the yet-to-be-ratified Cambrian Series 2; the lower portion base of the formation and the youngest lagerstatte beds date to the ''Nevadella'' trilobite zone (= Laurentian Montezuman stage), with higher beds dating to the ''Olenellus'' trilobite zone (= Laurentian Dyeran stage), making the formation the same age as the Sirius Passet and just younger than the Chengjiang.〔 It outcrops in Esmerelda county in western Nevada.〔
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