30357 - Classic New York Trilobite - Arctinurus Boltoni - Silurian Tetragramma Impressive and precious specimen of

Impressive and precious specimen of native gold in its hydrothermal quartz matrix

from the base to the tip

In the same matrix you can also see a tooth of Platecarpus ptychodon (mosasaurus species) and what appears to be a rib fragment or the transverse process of another vertebra just below the neural spine of the main vertebra

Beautiful and authentic example of 5

presumably due to a gradient in the amount of cement precipitated

30357 - Classic New York Trilobite - Arctinurus Boltoni - Silurian Tetragramma Impressive and precious specimen ofArctinurus boltoni (Bigsby, 1825) Lower Silurian Rochester Shale Formation Caleb's Quarry Middleport, New York, U. S. A.