Eurypterus sp. & Plant.
Eurypterus
Even the protrusions of the appendages that look like they are growing from Eurypterus's - the sea scorpion's - head are beautifully preserved. The abdomen retains enough three-dimensionality to show its swell, and this specimen from the Late Silurian - about 410 million years ago - is preserved in excellent condition, from the pair of paddles (oar-like appendages), segments, to the telson. It doesn't look 400 million years old. Among living organisms, it is said to be closely related to the horseshoe crab.
In the center of the matrix, you can also see a Y-shaped Silurian plant fossil called a 'finger plant'.
