8Fossil sites
Extension Formation
Extension Formation in Canada: 8 fossil sites. Typical age: 90–72 million years (Cretaceous).
8Fossil sites
0Finds
90–72 million yearsTypical age
CretaceousMain period
Where its fossils were found
Cretaceous
By geological period
Cretaceous8
Towns with the most fossil sites nearby
Other formations of the same period
Cretaceous
Dinosaur Park Formation 393Dunvegan Formation 158Oldman Formation 146Horseshoe Canyon Formation 118Haida Formation 84Kaskapau Formation 70Bearpaw Shale 57Scollard Formation 54Foremost Formation 52Brazeau Formation 51Mason River Formation 51Pierre Shale 50Milk River Formation 41Shaftesbury Formation 41Haslam Formation 40Deer Bay Formation 36Westgate Formation 35Frenchman Formation 32Kanguk Formation 32Wapiti Formation 30Gething Formation 28Second White Specks Formation 28Gates Formation 27Bearpaw Formation 24