﻿0. Meyer — Tertiary and Grand Gulf of Mississippi. 21 



five feet, twenty feet of it composed of these clays. Taking 

 the dip into consideration the total thickness shown is about 

 forty feet. Small pieces of lignite are disseminated through 

 the layer, but no fossils were found by Mr. Aldrich and my- 

 self. Not only the general dip of the strata in this cut, a? 

 mentioned, changes suddenly, but besides this, the stratification 

 shows cross-bedding* Between this cut and Terry ledges of 

 white Grand Gulf sandstone, several feet thick, crop out at 

 different places. 



In recapitulation we have Vicksburgian strata occurring in 

 Byram station and Grand Gulf strata occurring about five miles 

 south of it, but the contact of the two formations cannot be ob- 

 served along the railroad. 



4. On the railroad from Meridian to New Orleans the Marine 

 Tertiary reaches at least as far as Heidelberg, Jasper County, 

 for there is blue limestone, from which I collected Orbitoides 

 and Pecten Poulsoni in an abandoned quarry about one mile 

 and a half southeast of this town. Walking along the railroad 

 we meet a clav of a light greenish blue color at a point four 

 miles south of Heidelberg. At a point eleven miles south of 

 this town (south of Erata, Jones County) the railroad cuts 

 about ten feet of gray sandy clays and white sands without 

 fossils. 



5. In Pelahatcbee on the Vicksburg & Meridian Railroad we 

 find Marine Tertiary clays with Pecten calvatus? Mort., Scalaria 

 ■sp., teeth of sharks and Miliobates, vertebra of fish and clayey 

 concretions containing casts of shells, especially of Protocardia. 

 Three miles west of it we meet the first cut of Grand Gulf 

 strata — laminated clays — but the contact of the two formations 

 cannot be observed here. 



6. Walking farther west from the just mentioned cut of the 

 Grand Gulf clays toward Brandon, we meet another exposure 

 of these laminated clays a mile distant. They have a thick- 

 ness of more than twenty feet and show a very strong westward 

 dip. Another mile farther on, the same strata, of about equal 

 thickness, are nearly horizontal. Another exposure is met 

 about one mile and a half still farther west. It consists of 

 laminated clays of about eighteen feet thickness, containing 

 impressions of leaves. Sometimes the beds are more sandy, 

 and in a few places they show cross-bedding. These clays are 

 here enclosed in two lignitic streaks. The lower streak con- 

 sists of almost pure lignite. Below this lower lignitic streak 

 there are seen gray clayey sands without visible stratification. 

 These sands at this point were not examined as to whether they 

 contain fossils or not. The dip in this exposure, which consists 

 of two connecting cuts, is west. The next cut is about a mile 



* Discordante Parallelstructur. 



