lo4 VHOOKKlMNiiS OF TllK AOAPKMY OP [ISSl. 



IhhI No. i of the invcoiiing- sootiou is oonsidercil by Pr. Smith 

 to bo most closely rehited in the ohnriieter of its fossil remains to 

 the fossiliferons strata exi^osed on Cave and Knight's branches, 

 and it is therotiMv not unlikely that the series l-o corresponds in 

 the main \Yith No. - of Tuomey 's Bashia section. The basal lignite 

 would then probably be found to underly the lowest stratum 

 exhibited at the Bluti* (Heilpriii, loc. cit., p. 3ti7-S\ Bed No. 6 

 (Wood's Blutf section "i can be traced down the river for a distance 

 of two to three miles, when it dips beneath the water's level. 

 Somewhat below this point, and beyond the mouth of Witch 

 Creek, the stratigraphieal relation of the dili'erent beds is beauti- 

 fully exhibited in a prominent clitl i^" White Blutf "^, rising from 

 250 to 275 feet above the river. The upper portion of this blutl" 

 is constituted by the characteristic siliceous clay-stones and silici- 

 fied shell deposits of the southern '' Buhrstone " formation, which 

 make up fully 100 feet of the vertical height. Laminated lignitic 

 clays (bearing numerous leaf impressions), with occasional inter- 

 calated beds of pure lignite, enter mairly into the composition of 

 the intermediate portion, /. e., from the water's level to the base 

 of the buhrstone above mentioned. Allowing a uniform southerly 

 dip of 10 feet to the mile, which appears to be consistent with 

 obtained data, it is manifest that at this point the lower fossiliferons 

 strata exposed at Wood's Blutf (and consequently, the equivalent 

 deposits on Bashia Creek and its tributaries. Cave and Knight's 

 branches) must lie from 175 to 200 feet below the base of the 

 siliceous mass constituting the true buhrstone ; or, in other words. 

 we have here a series of deposits aggregating about 300 feet in 

 thickness, which can be shown to be of an age anterior to the deposi- 

 tions of the Claiborne fossiliferons sands. At Baker's Blutf, a fcAv 

 miles above St. Stephen's (which is situated about twenty-eight 

 miles south of Wood's Bluif ). the buhrstone, according to Tuomej', 

 appears in a vertical escarpment rising only 50 feet above the 

 water, a low height perfectly in accordance with the loss occa- 

 sioned by the general dip extending over nearly twenty miles. 

 At this point, moreover, and occupying a position above the 

 buhrstone. Tuomey yloc. ej7.,p. 14S) identities a bed of green sand 

 (8 feet in thickness) as the equivalent of the Claiborne fossilifer- 

 ons sands " d " of his section), and containing numerous fossils 

 identical with those foimd at Claiborne. Still further south, and 

 occupying a considerably lower level, the same bed is described 



