“Locally, intense brecciation gave rise to angular vein quartz fragments enveloped by a matrix of massive hematitic rock.”

“Where limestone occurs adjacent to ironstone, it shows various stages of replacement by chert and hematitic material parallel to bedding and along fractures.”

“Freshly broken surfaces exhibit interstitial matrix that ranges from fine-grained, clean quartz sandstone and siltstone, hematitic claystone and cements.”