46 The American Geologist. January, 1903. 
Chalcocitc — Daubrec — Bourbonnc les Bains, ibid. 
Daubree — Baracci, Corsica. C. R. 92:57, 1881. 
Daubree — Flines les Roches. C. R. 93:572. 1881. 
CInilcopyritc. — Daubree — Begneres de Bigorre. Bull Soc. G-.0I. France 
19; 529, 1862. 
Daubree — Bourbonne les Bains, iljid. 
Daubree — Flines les Roches, ibid. 
Gouvenain — Bourbon I'Archambault. ibid. 
Ch/tZ/c— Fktchcr — Chester, ibid. 
Breislak — Torre del Greco. Physische u. lithologische Reisjn 
durch Campanien, 1802, p. 204. 
Malachite — Lacroix — Algeria, ibid. 
Fletcher — Chester, ibid. 
Tetnilicdritc — Daubree — Bourbonne les Bains, ibid. 
Columbia University in the city of New York, Dec, Ig02. 
AN ERRATIC BOWLDER FROM THE COAL 
MEASURES OF TENNESSEE. 
By S. W. McCalub, Asst. Geologist of Georgia, Atlanta. 
Two years ago last summer while on a visit to the Etna 
coal mines located near Chattanooga, Tenn., my attention was 
called to a bowlder which a short time before had been found 
near the center of a three-foot coal searn. The main attractive 
feature of the bowlder to the miners, and apparently the cause 
which led to its preservation from the waste dump, seemed 
to have been the glittering particles of pyrite to be seen at 
several points on its surface. The pyrite was supposed by 
the miners to be gold, and as a consequence the bowlder w^as 
spoken of as the "gold rock." 
The writer learned that a short time previous to his visit, 
the bowlder had been shown to one of the United States geol- 
ogists, who, though then engaged in collecting fossil coal plants 
at the mines, broke off and carried away a small piece of the 
stone. With the exception of the removal of this fragment 
and a few marks made by the pick in dislodging it from the 
coal seam, the bowlder was entire and not otherwise mutilated. 
The bowlder was elongated, somewhat kidney-shaped, and 
would' weigh when entire twenty or thirty pounds. Its sur- 
face was quite smooth and had every appearance of having 
been w^ater worn. In shape and in size it was not at all unlike 
