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olorotitan

Help with cambrian Trilobite ID

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olorotitan

Hi there, I have an old trilobite that I bought 20 years ago as a pre-teen that I have now completely forgotten all details of.  I remember it was from a US locality, definitely a cambrian age trilobite.  It's pretty small, measuring about 7 - 8 mm.

 

Looking at it now I think it's a Zacanothoides or Olenellus but I cant be sure.  It has a long genal spine and what looks to be an impression of another spine at the tip of its pygidium.

 

As a bonus, if anyone recognizes the locality from the look of the matrix that would be awesome.  I was thinking Pioche Formation in Nevada but could be wrong.

20190222_221602.jpg

20190222_222053.jpg

20190222_222118.jpg

20190222_222413.jpg

Edited by olorotitan

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Fossildude19

Welcome to the Forum. :)

Cropped and contrasted: 

 

20190222_221602.jpg.e494e37c8ad9634887e3857e0b93334c.jpg   20190222_222053.jpg.da148b74eefe47c95535e9d2eb0ecb91.jpg   20190222_222118.jpg.ea809f927889c022bd6d78c2b70ffbf6.jpg   20190222_222413.jpg.2aa70ec6e586d5ae6e4f9caa3935caf5.jpg

 

Looks like Pioche Shale of Nevada.

 

 

@piranha

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olorotitan

@fossildude19  Thanks for the assistance.  I didn't think about cropping it- that helps.

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piranha

Zacanthoides has a long thoracic spine.  The pygidium is absent on the posted specimen.  Attached is another similar example. 

 

image.thumb.png.16717b41370b43e52067089d74493a90.png

 

figure from:

 

Gon, S.M. 2009

A Pictorial Guide to the Orders of Trilobites.

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suchomimus20

the one that resembles it the most is the Olenellus

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DevonianDigger

+1 for Zacanthoides

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