376 The American Geologist. Jnne.ioos 
Drift 10 ft. 
Corniferous limestone 100 ft. 
Monroe and Niagara formations 970 ft. 
Niagara shale and Clinton formation 105 ft. 
Medina shale 175 ft. 
Cincinnati shale and limestone 500 ft. 
Utica shale 310 ft. 
Trenton limestone at 2210 ft. 
The Monroe and Niagara limestones were found to 
contain g^^psum, fourteen different layers having been pene- 
trated. The highest lay no feet below the summit of the 
limestone and the lowest was near the base. No rock-salt, 
however, was found, and hence the salt beds do not extend 
as far west as Sandusky. However, the area beneath 
which these deposits have been demonstrated to lie, and 
the thickness of the beds in question show that Ohio con- 
tains enough salt to supply the entire country for an in- 
definite period. 
MINERALOGICAL SYNONYMS. 
(From the Mineralogical Magazine, May, 1905.) 
New names are still being given to imperfectly des- 
cribed minerals, but it is satisfactory to observe that many 
of these doubtful species, as well as some earlier ones, are 
being proved to have no existence. Such names need, 
therefore, only burden the lists of synonyms in the larger 
works of reference. Amongst identities recently proved, 
or suggested on good grounds, the following may be noted: 
Conchite = aragonite (R. Brauns, Centralbltt Min., 
1901, p. 134; H. Vater, Zeits. Kryst. Min.. 1901, vol. xxxv, 
p. 149). 
Coolgardite =: coloradoite + calaverite, &c. (L. J. 
Spencer, Min. Mag., 1903, vol. xiii, p. 268.) 
Dimorphite ^ orpiment (S. Stevanovie, Zeits. Kryst. 
Min., 1904, vol. xxxix, p. 18). 
Goldschmidtite = sylvanite (C. Palache, Amer. Journ. 
Sci., 1900, ser. 4, vol. x, p. 422). 
Hessenbergite = bertrandite (F. Griinling, Zeits. Kryst. 
Min., 1904, vol. xxxix, p. 386.) 
