ST. JOHN.] SECTION LARAMIE GROUP. 353 



terminates. In this steep slope the following ledges are imperfectly 

 exposed : 



7. Dark gray calcareous gritty bed, sometimes couglomeritic or brec- 

 ciated, coutaiuiiig numerous i)oorly preserved Lamillibranchs, Gastero- 

 pods, and vertebrate remains, probably tishes. The fossils are imi)acted 

 in tb(i tough matrix, from which they are obtained in so mutilated con- 

 dition as to render their identification doubtful. Dr. White, however, 

 refers one of the most prevalent forms to Unio, at tlie same time noting 

 a resemblance it bears to forms occurring in the Laramie beds in the 

 region to the south. The Gasteropods are indeterminable, while in 

 regard to the vertebrate remains, which were submitte«l to Professor 

 Cope, their affinities remain as yet undetermined with the exception of 

 some small-sized gar scales which, although not specifically determin- 

 able, are probably of Tertiary age. 



8. Underlying the last-mentioned stratum occurs a thickness of sev- 

 eral hundred feet made up of red and drab gritty shales, including soft 

 gray sandstone layers, which descend into the saddle north of Station 



XVI, where they rest upon — 



9. Fragmentary drab limestone, forming a low debris-strewn ridge at 

 the foot of the descent. Tliis outcrop may be traced at intervals more 

 or less interrupted in a southeasterly direction, reax)pearing in the low 

 ridge between the forks of John Gray's Creek northwest of Station 



XVII, where its outcrop gives a banded appearance in the grassy slopes. 

 It contains numerous individuals of a small undetermined Gasteropod. 



10. Ascending the long slope to the north, the latter limestone is im- 

 mediately followed in descending order by gray, cross-bedded sand- 

 stone, interbedded with chocolate-red shales and indurated ferrugmous 

 layers. These beds form a heavy deposit, showing local distuibance^ 

 but with a normal dix) S. 45° W. at an angle of about 20°. 



11. Higher in the slope the position of another limestone bed is marked 

 hj the drab, fragmentary debris which strews the surface. Besides a 

 fi'agment of bone, there were also seen other obscure fossils. The rock 

 is less brittle and hghter colored than bed 9. 



12. Dii'ty and sometimes reddish-buff, very hard, brittle, si)ar-seamed 

 sandstone. The rock shows sHckenside surfaces, is almost the hard- 

 ness of quartzite, and contains vegetable impressions like sections of 

 limbs. Its debris covers the siu'face extending up into the summit, 

 which is capped by a heavy ledge of — 



13. Grayish-blue trachytic rock, having a distinct bedded structure,, 

 in fkm, uneven layers 2 to 12 inches or more in thickness. The rock, 

 presents a low wall in the crest of the hiU facing southwestward, ia 

 which the exposed edges of the layers reach a thickness of 5 to 15 feet^ 

 dipping 10°, X. 50o'E. 



Such as they were, the few obscure vegetable remains found in con- 

 nection with the sandstones of the foregoing section were submitted tO' 

 Professor Lesquereux for examination, who kindly informs jue that,, 

 though too indistinct for minute determination, they are undistinguish- 

 able li'om similar vegetable relics ])revalent in ])erfectly authenticated 

 Laramie beds at numerous localities in the Xorthwest. This, together 

 with Dr. AVhite's determination of the probable affinities of the inverte- 

 brate fossils before alluded to, as well as the probable relations of the- 

 vertebrate remains communicated by Professor Cope, afford ground for 

 referring all these deposits to the age of the Laramie Group. As we 

 shall have l)ecome more familiar with the fauna and tlora of the rocks 

 of these distant regions, the doubts of to-day may appear almost without 

 foundation and vanish. But these residts are the outgrowth of time, 

 23 GS 



