770 WILLIAM F. PROUTY 
The above analysis shows the specimen to be a high-grade bitumi- 
nous coal. Its composition is almost identical with that of the seam 
which lies some 60 feet below it, the Duree seam of coal which 
gives the following analysis: 
Moisture sy 22... eee ee ae ae veal 2.30 
Molatilesmatter can uae eee 38.58 
Kixedtcarbon’. jcc cena ein oes 54.11 
INSTR pene pe sccc si is ce Sora cee tee mc yn CON: 5 OL 
100.00 
The origin of the pebbles is not perfectly clear. That the mate- 
rial forming the pebbles was water-worn before being imbedded in 
v 
Fic. 1.—Water-worn coal pebbles occurring in coarse-grained sandstone in upper 
measures of Warrior Coal Field, Ala. No.2 is a portion of a pebble 8 inches in 
diameter. ° 
the coarse sand and conglomerate is very evident, and that the 
agent of erosion was a carboniferous stream is also evident, but 
whether the material now forming the coal was then in the form of 
chunks of coal or pieces of lignite or less carbonized wood is not 
apparent. 
It is a well-known fact that at the present time pebbles of coal 
are being transported and rounded by stream action, yet the ques- 
tion would naturally present itself as to where the carboniferous 
stream could get this coal, since it is not possible that the beds of 
coal below could furnish it without a considerable warping and 
erosion of the strata prior to the period of the deposition of the 
coal pebbles, but such warping and erosion is not known, and even 
