A far more complete presentation of trilobite images, links, and related information can be found at Kevin Brett's Trilobite home page . The quality of some images presented here is not great because I often use a video-capture setup with limited resolution. It is more convenient than film, and, most importantly, it saves film and processing costs for a project which is just for fun. The trilobite images are arranged in approximate stratigraphic order, with the oldest at the bottom and youngest at the top, and subdivided into geologic periods.
Additional information is available on the subdivision of the geologic time scale .
Carboniferous and Permian No specimens available, yet. Trilobites are comparatively rare after the Devonian. This phacopid trilobite has a bizzare inflated glabella and hypostome. Note the large schizochroal eye and furrowed glabella. Unfortunately, I know of no subsequent published work on the trilobites of Arisaig, so I can not confirm the identification.