Evidence for initial calcite – aragonite composition of Lower Algal Chert Member ooids and stromatolites , Paleoproterozoic Gunflint Formation , Ontario , Canada

@inproceedings{SommersEvidenceFI,
  title={Evidence for initial calcite – aragonite composition of Lower Algal Chert Member ooids and stromatolites , Paleoproterozoic Gunflint Formation , Ontario , Canada},
  author={Mathieu G. Sommers and Stanley M. Awramik and Koan Sik Woo}
}
The chert members of the Paleoproterozoic Gunflint Formation, Ontario, Canada, are commonly regarded as examples of primary silica chemical sediments. This interpretation is founded upon the ubiquitous nature of silica, high fidelity of preservation of microfossils found within, and lack of observed primary carbonate. Previous arguments for silica replacement of carbonate are based on indirect evidence and are largely dismissed. Thus, Gunflint microfossils are regarded as having lived in a… CONTINUE READING