File:Nevadella sp. (fossil trilobite) (Poleta Formation, Lower Cambrian; Indian Springs Canyon, Montezuma Range, Nevada, USA).jpg

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English: Nevadella sp. - partial trilobite cephalon in the Cambrian of Nevada, USA. (geology hammer for scale)

This outcrop is in the middle member of the Lower Cambrian Poleta Formation in Nevada's Montezuma Range. The rocks in this interval represent storm-dominated deposits. Gutter structures are present. Orthothecid hyoliths (= tapered, conical fossils in the float sample seen above) occur in some abundance at certain levels. Click on the photo to zoom in to the right of the geology hammer. Notice the partial trilobite head - a Nevadella cephalon. This occurrence is just below the nevadiid trilobite extinction horizon (= Montezuman Stage-Dyeran Stage boundary).

Classification: Animalia, Arthropoda, Trilobita, Polymerida, Redlichiida, Olenellina, Fallotaspidoidea, Nevadiidae

Stratigraphy: a little below 21.5 meter mark in section, <88 meters above the base of the middle member of the Poleta Formation, ~uppermost Montezuman Stage, Lower Cambrian

Locality: outcrop along the northern side of Indian Springs Canyon (= section IS-4 & stop 11 in Laurentia 99 field trip guidebook), Montezuma Range, eastern Esmeralda County, southwestern Nevada, USA (vicinity of 37˚ 43' 22.25" North latitude, 117˚ 19' 23.20" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/30832965317/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30832965317. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

13 October 2020

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current01:53, 13 October 2020Thumbnail for version as of 01:53, 13 October 20201,797 × 1,198 (2.83 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/30832965317/ with UploadWizard

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