James St. John: Dolomitic marble (Precambrian)
James St. John: Dolomitic marble (Inwood Formation, Cambrian to Lower Ordovician; Thornwood, New York State, USA) 1
James St. John: Dolomitic marble (Inwood Formation, Cambrian to Lower Ordovician; Thornwood, New York State, USA) 2
James St. John: Dolomitic marble (Inwood Formation, Cambrian to Lower Ordovician; Thornwood, New York State, USA) 3
James St. John: Dolomitic marble (Inwood Formation, Cambrian to Lower Ordovician; Thornwood, New York State, USA) 4
James St. John: Dolomitic marble (Inwood Formation, Cambrian to Lower Ordovician; Thornwood, New York State, USA) 5