However , microfossils such as stromatolites and oncolites prove that , in shallow marine environments at least , life did not suffer any perturbation .
Detractors argue that this kind of glaciation would have made life extinct entirely .
Microfossils such as stromatolites and oncolites prove that , in shallow marine environments at least , life did not suffer any perturbation .
Detractors argue that this kind of glaciation would have made life extinct entirely .