. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . ains 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 overhang the route, arebeds of gypsum from one-half to one foot inthickness, and the marls, which are red andin some pla
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . ains 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 overhang the route, arebeds of gypsum from one-half to one foot inthickness, and the marls, which are red andin some places green, are saliferous. Thereare also holes filled with very brackish andmagnesian water, which is insupportable tothe taste. We ascended from the valley ofthe Canadian river to the summit of the Llano,and found the beds of red marls turning intored sandy shales, and strata of dolomite fromthree to five feet thick. The diluvium fromthe Rocky mountains is abundant and coarse. September 13.—At No. 42, where we rested,we found a beautiful exhibition of the dolomiteof the Trias of the prairies, with red and greenmarls and white amorphous RESUME AND FIELD NOTES. 135 14 Septembre.—Du No. 42 au No. 43.—On ja le diluvium des Rocky mountains avec sable jblanc, et des cliffs dans les creeks de white sand- Jstone, un peu rose, avec calcaire Camp No. 43, ou Rio Bonito, on a ungrand developpement de ce gres, tres-friable,rose et blanc avec concretions calcaires etcoucbes calcaire blanc. Pas de fossiles. 15 Septembre.—A 4 miles du Camp No. 43on a des monticules de marnes sableuses rougesavec une couche des gres rouge en contact avecun gres friable comme a Antelope Hills. A 8miles on a Amarillo arroyo une dolomie ou. ily a du sulphate de baryte, au-dessus et au-dessous on a les sandy red marl. Des couchesde sandy marl, au lieu detre rouges et vertessont jaune verdatre, 15 pieds depaisseur et unpeu dolomitiques. Lepaisseur de ces marnes irises ou par tie
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