The Gunflint Chert - Fossil Ecosystems of North America: A Guide to the Sites and their Extraordinary Biotas - page 6

5

5 Domed stromatolitic
bioherm growing on the
Archean erosional surface, near
Kakabeka Falls Provincial Park,
Ontario.

6

6 Circular stromatolitic
bioherm in Gunflint Chert, on
the north shore of Lake
Superior opposite Flint Island,
near Schreiber, Ontario.

7

7 Mary Ellen Jasper, a
stromatolitic red chert from
the Mesabi Iron Range of
Minnesota, equivalent to the
Gunflint Chert MM.