uncommon
gowganda tillite
ice-age mud · a later ice age moved it again
The tell
A dark gray-green muddy matrix with ANGULAR fragments of all sorts scattered through it at random. Puddingstone is white with red.
It is glacial debris dumped into deep water off an ice sheet 2.3 billion years ago. The fragments are what that ice was carrying. Older than complex life, and it still looks like someone stirred gravel into wet cement.
What it gets mistaken for
- puddingstone
- kona dolomite
- conglomerate
- concrete
The facts
- also calledice-age mud · a later ice age moved it again
- age~2.3 billion yrs
- where it turns upOntario erratic · statewide float
- the field markangular chips adrift in dark mud · nothing sorted
10% of every order goes to northern Michigan animal shelters.