And the “ Great Carolina Marl Bed.” Z 
has been given, and make it universal ; for derived, as 
it usually is, from languages common to all scientific 
men, when once adopted, there can no longer be any 
misconceptions. 
NAMES GIVEN TO THE PHOSPHATE-ROCKS. 
Writers have called these rocks by different names ; 
this has occurred even in the writings of scientific 
men, who should have at once fixed upon one name, 
and brought it into general use. 
They have been called Marl-rocks, Marl-stone, 
Bone-phosphates, Phosphate-rocks, Coprolites, Con- 
glomerates, and sometimes Bone-rocks. These names 
have been so used by writers of late that one is some- 
times at a loss to know which of all the mineral pro- 
ducts of the region is meant. 
That there may hereafter be no mistake as to the 
name, we have adopted that of PHOSPHATE-ROCKS, as 
the best and most comprehensive. For, though by 
the terms Bone-phosphates, Marl-rocks, or Marl- 
stones, they might very properly be called, we think 
the name Phosphate-rocks, is more in accordance 
with popular usage, and conveys also a better idea of 
their true character. 
And here it may be remarked, that these rocks are 
not Conglomerates, Coprolites, or Bones, and that the 
teeth and bones which are found mingled with the 
Phosphate-rocks in their beds, should not be called 
