"cambrian" statistics

associated to cambrian 1. jurassic v. strong 2. permian medium 3. silurian weak 4. ordovician weak 5. precambrian v. weak

associated from cambrian 1. ordovician v. strong 2. triassic v. weak 3. precambrian v. weak 4. permian v. weak 5. cretaceous v. weak

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