This trilobite shares its rock with a horn coral. During the Devonian upstate New York was a shallow tropical sea south of the equator. This was identified as Greenops boothi when I bought it. But it seems to be closer to to G. barberi.
Image Files
In addition to viewing the images on this page, you have the option to download the detailed (and large) image files, or to display the detailed files in your browser. (Refer to the buttons below each image.)