The Blue Ridge Esker of Jackson, Michigan is well known for the sandstone cobbles it produces. Many if not all these cobbles, when broken open contain many fossils. Pelecyopds (clams) Cephalopods, ammonoids, fish material and the list goes on.
An Esker is the remains of an under glacier river. A geological formation as a long ridge of gravel and other sediment, typically having a winding course, deposited by meltwater from a retreating glacier or ice sheet. In this case as the glacier retreated it formed a river that picked up sandstone boulder and tumbled them down a river. In Jackson the river made a turn and deposited these rounded, tumbled cobbles.
When broken open they reveal the ancient life of the Mississippian Period.
This is a slice of an irregular sandstone cobble which contains many pelecypods, (clams) and two Mooreoceras Cephalopods, one quite large.
It comes in this handsome glass topped, Leatherette collectors case. that is 4 1/2 by 5 1/2 inches.
This is the specimen you will receive.