238 Chemical Composition of Recent and Fossil Lingula, 
red and green shales, and belohgs to the top of the Hudson River 
group or the base of the Oneida Conglomerates. .The phos 
hatic masses are very abundant, and rounded, flattened, or cyl- 
diameter ; they sometimes make up the larger part of the con- 
glomerate. Iron pyrites in small globular masses occurs abund- 
antly with them, often filling their interstices, but is not found 
elsewhere in the rock. These coprolites are finer grained and 
more compact than those from the Ottawa, and have a conchoidal 
fracture ; their color is bluish or brownish black; the powder 
is ash-grey, becoming reddish after ignition. They have the 
hardness of calcite aud a density of 3:15. When heated they 
evolve ammonia with an animal odor, and with sulphuric acid 
give the reactions of fluorine. The quantitative analysis of one 
gave— : 
Phosphate of lime, PO*,3CaO, - 40:34 pc. 
Carbonate of lime, with fluorid, - 5:14 
Carbonate of magnesia, - 2k O79 
Peroxyd of iron with a little alumina 12°62 
Oxyd of manganese, - - - trace 
Insoluble silicious residue, - - 25°44 
Volatile maiter, he tele gehe twig gS 
95:37 
bodies, resembling bones in appearance. ‘The longest one 3S au 
inch and a half long, and one-fourth of an inch in diameter. 
is hollow throughout, and had been entirely filled with the cal- 
careous sandstone, in which it is imbedded, and whose isinte- 
gration has left the larger end exposed. The smaller extremity 
is cylindrical, and thin, but it gradually enlarges from a thickeD- 
ing of the walls, and at the other end becomes externally some 
what triangulariform ; the cavity remains nearly cylindrical, 
the exposed surfaces are rough and irregular within. 
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