rare
gowganda tillite
glacial diamictite
The tell
A dark grey-green muddy matrix with ANGULAR fragments of all sorts scattered through it at random. Puddingstone is white with red.
It is a frozen glacial mud from an ice age 2.3 billion years ago. The fragments are what that glacier was carrying. It is a snapshot of a moraine older than complex life.
What it gets mistaken for
- puddingstone
- kona dolomite
- conglomerate
- concrete
The facts
- also calledglacial diamictite
- age~2.3 billion yrs
- where it turns upSuperior shore ยท Ontario erratic, scarce
- on the chartrare · 250 stickers ever
Put it on the shelf
Every stone on this chart is drawn and kiss-cut at three inches. The rarer the stone, the fewer exist: only 250 gowganda tillite will ever be printed, then the run is retired.
10% of every order goes to the Roscommon County Animal Shelter.