172 Tertiary. 



gone ages high up in the valle^^ of the Missouri, towai'd the source of 

 its western tributaries, where now pasture the big -Jiorned Ovis 

 montana, the shaggy buffalo, 'or American bison, and the elegant and 

 slenderly constructed antelope. 



A section of the Tertiary of the "Bad lands," or, " Mauvaises 

 Terres," in descending order, is as follows : 1. Ash coloi'ed clay, 

 cracking in the sun, containing siliceous concretions, 30 feet. 2. Com- 

 pact, white limestone, 3 feet. 3. Light gray, marly limestone, 8 feet. 4. 

 Light gray, indurated, siliceous clay (not effervescent), 30 feet. 5. 

 Aggregate of small angular grains of quartz, or conglomerate, cement- 

 ed by calcareous earth, slightly effervescent, 8 feet. 6. Layer of 

 quartz and chalcedony (probably only partial), 1 inch. 7. Light gray, 

 indurated, siliceous clay, similar to No. 4, but more calcareous, passing 

 downward into pale flesh colored, indui'ated, siliceous, marly limestone, 

 turtle and bone bed, 25 feet. 8. White and light gray, calcareous 

 grit, slightlj'' effervescent, 15 feet. 9. Similar aggregate to No. 5, but 

 coarser, 8 feet. 10. Light green, indurated, argillaceous stratum 

 (slightly effervescent); Palseotherium bed, 20 feet. 



Dr. Joseph Leidy described, from the Eocene of Nebraska, 

 Eucrotaphus auritus, and from the Miocene of Virginia,* Crocodilus 

 antiquiis. now Thecachampsa antiquus. Prof F. Ungerj- described, 

 from the Tertiary of Texas, Slllimania texana, Roemeria amei'icana, 

 and Thuioxylon americanum. 



In 1853, Alexander Murrav;]; informed us that the cla3's on the Ot- 

 tawa, in the vicinit}^ of Bytown, at the mouth of the Gatineau on the 

 north, and of Green's creek on the south side, in addition to marine 

 shells, yield, in the latter locality, two species of fish, the Ilallotus vil- 

 losus, and Cyclopterus lumj)us, or lump-sucker, the former now living 

 and frequenting the Gulf of St. Lawrence in great numbers, and the 

 latter abounding on the northern shores of Scotland and America. 

 The fossils are enclosed in nodules of indurated clay of reniform 

 shapes, and occupy a bed nearly ou a level with the w^ater of the Otta- 

 wa, and about 118 feet above the tide level of Lake St. Peter. The 

 same sort of nodules frequently enclose fragments of wood, leaves of 

 trees, and portions of marine plants ; among the last is one of the 

 species of littoral algse still found near the coasts of Arctic seas. Be- 

 side the stratified deposits of clay and sand, there is a deposit of clay 

 drift, holding pebbles and bowlders, sometimes angular, but generall}' 



* Jour. Acad. Nat. Sci., 2d ser., vol. ii. 

 t Kreid. von Texas. 

 X Geo. Sur. of Canada. 



