34 E. W. Hilgard on the Tertiary formations 
(ibid., p. 146) and Conrad more decidedly avers (this Jour., Sept. 
1865, P- 266), Pied is a lower division to be distinguished, which 
white titi claystone, so remarkable for its Tighensae (Miss. 
Rep., p. 124), is much more extensively developed than I had 
anticipated ; that though often showing lithological transitions 
into chert and sandstone, it is on the whole characteristic of the 
superior part of the siliceous division, whose lower portion is 
represented by the soft yellow sandstone of South Neshoba and 
North Newton, its lowest probably by the hard, riage 
rock with chalcedonized shells, of the Marion ridge. (Ibid. 
All this tallies very closely with Tuomey’s observations in ee 
i where the “chalk hills” are also a matter of popular re- 
“Hower Lignite— Great Lignite group ?—The fauna of the lower 
division, which has never been studied as yet, I conceive to be 
represented i in the small fossiliferous sandstone deposi skirting — 
the Cretaceous in Tippah and Pontotoc (Miss. Rep., pp. 109-112); 
in the isolated patch of ferrnginous green sand of Shongalo, in 
Carroll, Holmes, Attala and Choctaw ¢ counties, Miss, which seems 
to have been struck again at 415 feet in the bored well at Jackson. 
(Ibid., pp. 121-123.) “As regards this deposit, I will call attention 
to the fact that it contains Aturea Alabamznsis, claimed by Con- 
rad as a leading fossil of the Great Lignite, and moreover closely 
resembles in its lithological en vitpe de the Shark river beds de- 
scribed by Meek and Hayde 
Finally, in Alabama, dies era, as Conrad vette is pra 
represented in the Bashia creek section of Tuomey’s firs t Report; 
which, since it is said to contain abundance of well preserved 
gt tt is well worthy of especial stu 
from this point, Conrad, [ale and others have been led 
by fitholopiedl appearances to extend the limits of the Great Lig- 
nite to the southward and westward, to gia Se above it, 
and bate probably, beyond the limits of the Tert 
(this Joni , Sept., 1865) inclines to wehke % this group 
the bared a containing tree ontlea “pose Rep, 1 53), obse get 
he 
