TUE CHP:STER AMPHII50LITE AND SERPENTINES. 91 



inches long, pseudomorpli after eiistiitite, and it carries considerable dolomite 

 disseminated, wliicli does not effervesce with IICl. Traced northward a few 

 rods it becomes a compact, gray, thin-liedded tremolite-schist, which lies in 

 contact with an eqnally thin-bedded, white crystalline limestone which 

 effervesces readily. Sonthward it is found in many bowlders around the 

 cemetery, and here the limestone contains very fine specimens of a rich- 

 green actinolite, and it crops out farther south on Truml)le Brook. Tlie 

 band can be traced north from Downey's, by the abundant bowlders of the 

 black sei-pentine, to the pasture back of H. Cooley's. The overlying rock 

 in the Cooley pasture is a coarse muscovite-biotite-schist, carrying much 

 cyanite in flat, colorless blades 1 to Ih inches long, but 20 feet of covered 

 space, possibly occupied by amphibolite, separates it from the serpentine. 

 The sei-pentine bed (bed No. 16) is about 50 feet thick, and is exposed 175 

 feet in length. Over the weathered surfaces of the ledge the great enstatite 

 crystals project in a close network. These crystals are great plates one- 

 half to 1 inch in thickness, 3 to 4 inches wide, and in average 6 inches 

 long, while some measure 14 inches in length. They are now changed to 

 a dull-black serpentine, but still retain the lustrous enstatite cleavage. In 

 the narrow meshes between these large plates is a rather coarse-granular, 

 limpid dolomite, dusted with small magnetite octahedra and broad plates 

 of colorless to oil-green talc. The band can be traced northwest from this 

 point by many large bowlders, and another locality occurs where the rock 

 appears in place southwest of the point where "Wildcat road" bends south. 

 Bowlders of the same rock occur northwest, in the bed of the Westfield 

 Little River, at the great bend a mile below "Pothole Rock." From this 

 point no traces of the bed have been found along the line of boundary 

 di-awn across Russell to the Atwater ledge, except where this line crosses a 

 little-nsed road, not on the map, which runs west from the sharp bend in the 

 road a mile above Atwater's to meet the dotted road. Careful search has 

 been made in the intervening, heavily wooded country, and the presence of 

 the rock as a continuous band is indicated by the abundant large bowlders 

 strewn over the country for miles southeast. The next outcrop is the one 

 mentioned above as Atwater's (bed No. 17), from the extensive exposure in 

 the high hill 1 mile N. 30° W. of the house of F. B. Atwater, in the south 

 comer of Russell and overlooking the Westfield plain. It was quarried 

 quite extensively by Mr. Atwater's father as "black marble." The bed is 



