the bedrock
dolostone
limestone with magnesium · slow to fizz
The tell
Looks exactly like limestone, and the difference is in the fizz. Vinegar on limestone bubbles right away; on dolostone it barely stirs unless you scratch the spot to powder first. Slow to fizz is the whole tell.
This is the bedrock up north: Door, the Straits, Drummond, the Bruce. Much of the Bruce shore is national park, so look all you want and take nothing.
What it gets mistaken for
- limestone
- banded chert
- marble
- pale sandstone
The facts
- also calledslow to fizz · the dolomites are named for it
- age~430 million yrs
- classsedimentary
- where it turns upDoor, the Straits, Drummond · not Bruce NP
- the field markonly fizzes where you scratch powder off it
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