& 
the Lead Mines of Missouri, §c. 65 
only granite between the Alleghanies and the Rocky moun- 
tains, we are lead to ask—is it a portion of the nucleus of 
our globe, covered on every side, for many hundred miles, 
with secondary rocks, and here heaving its head through the 
superincumbent strata, and standing alone ?. 
be what are we to conclude of oo lime stone: ? ze 
ed on I 
’ adds, that oe lime stone is met with, but that it is 
far less c common than in Ohio, Indiana,” &e. ‘At 108, 
speaking of the lime stone, which, he says, is the rock inva- 
riably met with in digging, and generally at the depth of 
fifteen or twenty feet, he remarks, that there are many va- 
rieties of it, the texture varying from very hard and com- 
pact, to soft and friable—the latter erumbling between the 
fingers, and being called rotten lime stone: lime s stone, he 
me is Poh eg 4 the basis on whith the mineral soil at 
Mine a Burton, and the numerous mines in its Vicinity re- 
poses. He sd stars of it as “ passing into transition and sec- 
_lime stone, in various places‘on the banks of ae 
Missicippi, between Cape Girardeau and St. Louis, 2 
becoming a variety of marble near Herculaneum.” Petices 
not inform us whether this primitive lime stone is erystal- 
line in its structure, or translucent, if not crystalline. He 
generally speaks of it as compact, and if he uses the word 
compact, in the sense to which Mr. Werner’s descriptive 
language limits it, we must remark that compact lime stone 
is rarely if ever primitive—the structure of this latter be 
almost always crystalline, and if ever co1 it will gen 
be translucent also, at least on the edges, but if com- 
pact ar 1a secondary lime stone, it willin most instances be 
perfectly opake. The compact translucent lime stone is is gen- 
eal of the transition, and not of the primitive class. 
The term marble, so introduced by Mr. Sch 
© vee EL to 3 — Tie” conclasive 5 rors baat 
eS ee 
