PLATE V. 



FIG. 



MARCASITE OF THE VARIETY KNOWN AS "SPEARHEAD PYRITES" ON LIMESTONE 

 FROM BRIDGEPORT QUARRY. 



FIG. 2. MARCASITE; Two UPPER SPECIMENS ARE OF THE VARIETY KNOWN AS "COCKSCOMB 



PYRITES;" LEFT-HAND LOWER SPECIMEN CONTAINS MANY STRIATED CLINODOME 



PLANES; RIGHT-HAND LOWER SPECIMEN SHOWS GLOBULAR MASSES 



IN NIAGARA LIMESTONE. 



