3 pack of cards and envelopes that was an original woodcut titled, "Devonian Reef, Age of Sponges." Blank inside, on the back it has an ecological message that says,
The Devonian period was a geologic age that had great diversity of species, especially those in the sponge and bivalve variety. It is known as an "age of fishes" but is really the "age of sponges" as well.
