Pyritized Eldredgeops Trilobite and Sponge Association
Order Phacopida, Family Phacopidae
with Porifera indet. and Crinoidea indet.
Time: Middle Devonian
mm = 1 inch): Trilobite: 8 mm across Sponge: 85 mm by 30 mm (maximum)
Matrix: 145 mm by 130 mm
Windom Shale, Hamilton Group, Moscow Formation, Erie County, New York
Here is a remarkable example of preservation: a totally pyritized
Eldredgeops rana trilobite. Its rich golden color has led me
to coin the term Midas Touch when referring to these specimens.
This is a recent find, and one that I do not believe has ever
been offered before. Pyrite is typically probe to the oxidative
degradation termed “pyrite disease”. Examples of
these have been subjected to forcing conditions with no ill effects.
Nevertheless as a precaution they have been given a coating of
an achival quality material which is employed in the conservation
of ancient artifacts. While all found to date are somewhat small,
they make up for lack of size in tremendous eye appeal. I have
very few of these, so if you want to add one to your collection
be quick. There is a large sponge which dominates the plaque.
Notice the upper quarter which shows that the sponge overlies
a crinoid. The outline can be seen with the calyx pointing to
the left and the stem extends to the right completely across
the sponge. This one is the ONLY example of an association piece
that I have.
trilobite pictures to enlarge