AUTHORS’ ABSTRACTS, 985 
Jamesburg formation corresponds with the Columbia. A twofold 
division of the Jamesburg is recognized, corresponding, in all proba- 
bility, with the “high level” and “‘low level’? Columbia of the south, 
as described by McGee and Darton. Sections (Pl. III.) are given 
showing the topographic and stratigraphic relation of the formations 
referred to in Sections V.-VIII. The report is accompanied by a map 
of the surface formations of the area covered by Sheet 6 (Basin of the 
Passaic and surroundings) of the New Jersey atlas, and Section X. is 
a brief statement intended to assist in an understanding of the map. 
The Stone Industry in 1894. By Wm. C. Day. Sixteenth Ann. Report 
U.S. Geol. Survey, Part IV., 83 pp., 1895. 
This report forms a part of the volume “ Mineral Resources of the 
United States.” It shows by numerous statistical tables the condition 
of the stone industry of the country in 1894 and compares this with 
former years. The various kinds of stone considered are included 
under the heads granite, marble, slate, sandstone, limestone and blue- 
stone. The term granite is used in the broad commercial sense and 
includes rocks of igneous and crystalline siliceous character. The 
total value of the stone output in the United States in 1894 was a 
little more than $37,000,000 being a gain of about $3,500,000 over 
1893. 
The distribution of the active quarries is shown by states and 
counties. Many analyses and results of physical tests are recorded, 
and the present methods of quarrying, dressing and manufacturing 
the various kinds of stone are given in some detail. It is also shown 
that indications early in the present year point to 1895 as a period of 
increased activity in quarrying operations. 
The Rocks of the Sierra Nevada. By H. W. Turner. Fourteenth 
Ann. Report, U. S. Geol. Survey, pp. 435-495, 12 plates and 3 figs. 
1895. 
The following sedimentary terranes are recognized: Grizzly forma- 
tion (Silurian), Calaveras formation (Lower Carboniferous), Robinson 
formation, chiefly tuffs (Upper Carboniferous), and Juras-Trias beds. 
All of the above terranes together with the associated igneous rocks 
were upheaved and folded at the close of the Jurassic. On their 
