452 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Ft. lu. 



No. 17. — Brownish and bluisli clays, witli some beds of white, 



greenish, and brownish sandstones , 115 



No. 18. — Hard gray conglomerate, standing nearly vertical, and 



forming crest of hill about 350 feet high 40 



No. 19. — Slope showing above some masses of conglomerate, like 

 that of division 18, perhaps not in place, with, at places below 

 this, some reddish clays ; altogether space enough for 500 to 

 600 feet in thickness 600 



No. 20. — Greenish- white sandstone 40 



No. 21. — Brownish clays and sandy layers 60 



No. 22. — Brownish clays and beds of sandstone, the latter light 



gray below 110 



No. 23. — Whitish sandstone — forms crest of hill about 220 to 240 



feet in height '. 40 



No. 24. — Conglomerate and some red clays 20 



No. 25. — Brownish and reddish clays with a few distantly sepa- 

 rated thin beds and layers of gray sandstone, altogether 750 

 to 800 feet in thickness 800 



No. 26. — Gray sandstone in place, apparently connected with 

 some masses (that may not be in place) so as to include space 

 enough for 60 to 80 feet — forms crest of a hill 80 



No. 27. A long space of perhaps 260 yards or more, with only 

 a few low exposures of light-gray sandstone, showing a 

 slight westward dip. 



No. 28. Numerous thin seams and layers of dark carbonaceous 

 shales, with harder thin bands of various colored argillace- 

 ous, arenaceous, and calcareous matter, including a few very 

 thin streaks of coal; the whole being highly charged with 

 vast numbers of fresh and brackish- water shells, such as 

 species of Unio, Corbicula, GorbtUa, Pyrgulifera, Viviparus, 

 Melampus^ &c. Dip nearly east, about 75° below the hori- 

 zon ; thickness 175 to 200 feet exposed. 200 



This section has been constructed rather with the Yievir of giving a 

 general idea of the upheaved and confused condition of the strata, and 

 (so far as can be done) of the relations of the undoubted Cretaceous 

 beds containing woikable beds of coal here, to the fresh and brackish- 

 water formation at its western end, than as an illustration of minute 

 details. The elevations, as well as the horizontal distances between 

 exposures, are only given from estimates carefully made at the locality; 

 while the thickness of the subordinate beds can scarcely be regarded 

 as more than approximately correct, as they are not all sufficiently well 

 exposed directly along the line of the section, to show their exact limits, 

 and our examinations were not extended very far laterally. It is be- 

 lieved, however, that the section will be found sufficiently accurate to 

 serve the purpose for which it is given. 



That the strata in which the workable beds of coal occur here (divis- 

 ions 1 to 12, inclusive) belong to the Cretaceous, has, as already ex- 

 plained, been well known for some years past. It is also evident that 

 this formation belongs to the same series as the Coalville coals. The 

 evidence of this is not only the general correspondence of the litholog- 

 ical characters of the rocks at these localities, but the presence here of 

 some of the same species of fossils found associated with the coal beds 

 at Coalville. Three of these fossils, Ostrea soleniscus, Trapezium micro- 

 7iema, and Inoceramus proMematicus, are also iDeculiar forms that can be 

 identified with the fullest confidence. 



