Authentic Large Arthropod Trilobite Fossil, 3 1/2 inches long

Description

Let me begin by stating that I know literally nothing about arrowheads, fossils or gemstones
I got the title of this item from something similar on Ebay but please let me know if I am wrong
My late husband was the collector, and at the time we lived in Pennsylvania
He started collecting as a child and I can remember even when we dated that we could go out searching for arrowheads in Pa, Moundsville WV, and places in Ohio
I now have approximately 8-10 containers filled with his collection but unfortunately no paperwork has been found
So bottom line is, I know these are authentic, however I cannot tell you what they are except in a few cases where I found similar items for sale on Ebay.  I am hoping that the photos will help you identify but if you need further help, please let me know.
PLEASE SEE MY OTHER LISTINGS
Thank you,
Jan