Duff Quarry (north of Huntsville, Ohio, USA) by James St. John ● portfotolio

James St. John: Pyrite in Silurian dolostone (Duff Quarry, Huntsville, Ohio, USA) 1

James St. John: Pyrite in Silurian dolostone (Duff Quarry, Huntsville, Ohio, USA) 2

James St. John: Pyrite in Silurian dolostone (Duff Quarry, Huntsville, Ohio, USA) 3

James St. John: Eurypterid (fossil sea scorpion) (Salina Group, Upper Silurian; Duff Quarry, near Huntsville, Ohio, USA)

James St. John: Pyrite in Silurian dolostone (Duff Quarry, Huntsville, Ohio, USA) 4

James St. John: Dolomite in vug (Duff Stone Quarry, Huntsville, Ohio, USA) 1

James St. John: Fluorite-dolomite in vug (Duff Stone Quarry, Huntsville, Ohio, USA)

James St. John: Dolomite in vug (Duff Stone Quarry, Huntsville, Ohio, USA) 2

James St. John: Dolomite in vug (Duff Stone Quarry, Huntsville, Ohio, USA) 3