. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . anc de dolomie. Deux ou 3 milles avantdarriver au Camp 41, on voit au milieu dungrand nombre de monticules de diluvium cail-loux, et couvert de vegetation, un monticuleconique avec une grande quantite de blocs dedolomie; cela provenant du sommet. September 11.—From Camp No. 40 to CampNo. 41.—We see the diluvium of the Rockymountains, with larger pebbles and blocks ofdolomite or magnesian limestone of the sur-rounding Trias. Abundance of
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . anc de dolomie. Deux ou 3 milles avantdarriver au Camp 41, on voit au milieu dungrand nombre de monticules de diluvium cail-loux, et couvert de vegetation, un monticuleconique avec une grande quantite de blocs dedolomie; cela provenant du sommet. September 11.—From Camp No. 40 to CampNo. 41.—We see the diluvium of the Rockymountains, with larger pebbles and blocks ofdolomite or magnesian limestone of the sur-rounding Trias. Abundance of white sandborders the river on the right and left. Wesee the New Red sandstone or Trias, with someveins of gypsum and a bank of white dolomitethree or four feet high, and caverDous or [?] with rosy-colored beds as at Salins. The red clays are found below and above thisbed of dolomite. Two or three miles beforereaching Camp No. 41, we see, in the midst ofa great number of hillocks of sandy diluviumcovered with vegetation, a conical hillock, thesides of which are strewn with a large quantityof blocks of dolomite which have fallen awayfrom tbe a. Diluvium, b. Red marl. c. Dolomite, d. Red marl. 12 Septembre.—Du No. 41 au No. 42.—Ona a peu de distance du Camp No. 41, dans lesbluffs qui dominent la route, des bancs degypse de \ a 1 pieds depaisseur, et les marnesrouges etun peuvertes en places sont y a des trous deau tres saumatre et magne-sienne, insupportable au gout. On monte dela vallee de la Canadian au sommet du Llano,passant a des schistes sableux rouges et epais-ses avec de dolomie, 3 on 5 pieds. Diluviumde Rocky mountains nombreux et un peu gros. 13 Septembre.—Au No. 42 ou. nous sejour-nons on a un bel exemple de dolomie du Triasdes prairies avec marnes rouges et vertes etgypse blanc, amorphe. DolomiteRed marlRed sandstoneRed marl September 12.—From Camp No. 41 to CampNo. 42.—At a short distance from Camp , in the bluffs which overha
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