...Gerald M. Friedman; Vijai Shukla Abstract Authigenic quartz euhedra are described from a well drilled in the Lockport Formation (Middle Silurian) southwestern Cattaraugus county, southwestern New York State. The formation is dolostone part of which is dolomicrite; the latter, occurring in the top...

... or inorganic, and the inter-framework pockets may be filled with sediment or later with cement. Sucrose dolomite contains the most common North American carbonate pore type. Available petrographic evidence indicates that it is formed by growth of randomly oriented, uniformly sized dolomite euhedra, accompanied...

..., rutile, silicates, and carbonates. In the vein, it forms euhedra generally devoid of inclusions. Locally, the euhedra are fractured, and the fractures are filled with native gold, calcite, and tetradymite. Textural relationships suggest that pyrite precipitated synchronously with and/or after gold...