in the Southern Old-tertiary. 427 



" some irregularity " (p. 128). But on our second profile, along 

 the Chickasawhay, he mentions, only southern dip. In II, how- 

 ever, he says, p. 37, that going southward, he finds an anomalous 

 reappearance of older strata in two different meridians. " One 

 of the cases is noticed in my report (p. 128). From Jackson to 

 Canton, etc." " The other case occurs on the Chickasawhay, con- 

 trary to the statement in my report (I. c), in making which I over- 

 looked some specimens and notes of 1855, then mislaid. Then he 

 describes how Jackson strata " dip up " again at the most 

 southern part of the belt of the marine Tertiary. Further he 

 continues (p. 38) : " So far, I have been unable to observe the ma- 

 rine Tertiary in juxtaposition with the Grand Gulf group on the 

 Chickasawhay and cannot positively assert that the former dips un- 

 der the latter at ally These statements, so far as I am aware, 

 Prof. Hilgard has not withdrawn in iater publications and there- 

 fore I cannot imagine anything else, than, that in penning .his 

 last article against my theory he has entirely forgotten his for- 

 mer publications. 



Before continuing, I give now a general profile across the 

 marine Tertiary of Mississippi and Alabama, based on these 

 observations of Hilgard and on my former researches. 



General profile across the Southern Old-tertiary. 



A', A", Lignitiferous strata with, gypsum, without Tertiary shells; (A', Eolig- 

 nitic, A", Grand Gulf); V, Vicksburgian ,- J, Jaekscmian; C, Claibornian. 



According to this profile the waters of the Tertiary formed 

 a belt in the direction E.S.E. to W.N.W. (as far as Alabama 

 and Mississippi are concerned). Their deposits overlie the A /; , that 

 is, the Grand Gulf group. If this profile is right, all existing 

 maps are wrong, since they represent the marine Old-tertiary as 

 underlying the Grand Gulf, which is usually colored as Miocene 

 (see the maps of Heilprin and McGee) ; while I think that, 

 with perhaps the exception of some local fresh- water formations, 

 the Grand Golf group is older than the marine Old-tertiary. 

 With this profile I need not explain why in the northern part 

 of the belt the dip is everywhere south, in the southern part, 

 however, becomes north, and why older strata reappear when 

 we go south. 



This phenomenon, observed twice by Hilgard in Mississippi, 

 was also observed by Tuomey in Alabama. I cite here Hil- 

 gard, II, pp. 36, 37 : " In the general (north and south) section 



