They resemble horseshoe crabs. I found a 3-4 inch trilobite fossil many years ago when my kids were little, and gave it to my oldest son at some point. We were visiting friends who lived across the road from Canandaigua Lake near Canandaigua, NY, and we were up the hill behind the house, in an area that had a lot of shale. I thought it was a good place to take some of those rocks and break them open, and that’s when we found the trilobite fossil. It was amazing to know that the water level had once been that high.
It was amazing to know that the land level had once been that low.......................