North American Eastern Tertiary — Meyer. 93 
and the earnest endeavor to adhere to facts and avoid specula- 
tions. A clearing up of the relation of the Tertiary to the 
Grand Gulf seems not to have been attempted. The Grand 
Gulf is supposed to occur in the southwestern part of the state, 
but it is doubtful whether a contact can be found there. It is 
to be noticed here that the survey apparently has shown, that 
the "white limestone" is younger than the Claibornian beds. 
This "white limestone" is considered usually identical with the 
limestone at Vicksburg, Miss., and this would tend to show that 
the Vicksburgian beds are younger than the Claibornian, tliere- 
fore younger than the intermediate Jacksonian strata; and hence 
it would be an argument against a synclinal of the Mississippi 
Tertiary and further conclusive against the greater age of the 
Grand Gulf. These conclusions, however, contain some weak 
points, one of them being the identity of the two limestones, 
•separated by so long a distance. It is of little use, however, to 
discuss this matter more extensivelv, in consideration of the fact 
that the direct contact of Grand Gulf and Tertiary has to be 
looked for and has to be determined beyond a doubt, and that 
nothing but this will contribute towards a decision of the question. 
The Atlantic Group. — The division of the Atlantic group 
from New Jersey to Florida, comprising mostly younger Ter- 
tiary strata has been attempted mainly by Prof. A. Heilprin, 
and a diagram explaining his views may be found in "explora- 
tions on the West coast of Florida," p. 127. So far as I have 
gone in mv effort to work out this part of the Tertiary I have 
been unable to find that his classification and determinations have 
been proved. The subdivisions of the Miocene seem to me 
hypothetical and their arrangement in parallelism with European 
subdivisions like the "First and Second Mediterranean" in 
Austria which are themselves stongly attacked, seems to be still 
more hypothetical. The orbitoidic limestone in northern 
Florida is with positiveness placed on the horizon of the beds 
of Vicksburg, Miss. Those specimens of rock which I have 
seen contain Orbitoides in a species which is not shown to 
be the Vicksburg species, and probably is different from it; and 
-contain besides a Pecten, which is entirely different from the 
Vicksburg Pecten pouhonl Morton, but which apparently 
agrees with the Jackson Pecten. These rocks therefore have 
