158 Mesozoic Series of Neva Mexico- — Marcou. 
serted in full my researches along the 35th parallel of latitude 
(1) "Resume of a geological reconnoissance extending from 
Napoleon, at the junction of the Arkansas with the Mississip- 
pi, to the Pueblo de los Angeles in California." {Report of 
Secretary of War. House Document 129, in Lieut. A. W. 
Whipple's Report of exploratio?is near the thirty HftJt. par- 
allel, chapt. VI, pp. 40-48. Washington, 1855.) A corrected 
edition of that resume was published at the end of vol iii, pp. 
165-171, of the quarto edition of the PaciHc railroad explor- 
ations. Washington, 1856. (2) "Geological notes of a sur- 
vey of the country comprised between Preston, Red river and 
El Paso, Rio Grande del Norte." Rep. Sec^y Y/ar, House 
Document 129, in Bvt. Capt. John Pope's Report of explora- 
tions near the thirty-second parallel, chapt. xiii, pp. 125-128. 
Washington, 1855. (3) "Resume d'une carte geologique des 
Etats-Unis et des Provinces Anglaises de I'Amerique du Nord, 
avec unprofil geologique allant de la valleedu Mississippi aux 
cotes du Pacifique et une Planche de fossile" {Bulletin Soc. 
Geol. France, t. xii, pp. 813-936, Paris 21 Mai, 1855). This 
geological map is the first map giving the Geology west of the 
Mississippi river to the Pacific ; along the 35th parallel, the age 
of the rocks, their position and geographic distribution are 
exactly given ; outside of the road followed by the expedition 
the geology is only approximative, as no geologist had ever 
traveled over the ground. The geological profile or gen- 
eral section from the Mississippi river to Los Angeles is 
the only general geological section we possess even to this day 
of the country extending between the Mississippi basin and the 
Pacific shores ; finally the plate of fossils made by Humbert, 
the artist who drew the fossils of Barrande and Deshayes, and 
who was considered the first draftsman of his time, represents 
the OstracecB found by me in the Jurassic system and the 
Neocomian of New Mexico and the Indian territory, and is 
the best and most beautiful plate of invertebrate American. 
Mesozoic fossils published even to this day. (4) "Geology of 
North America, with three geological maps and seven plates 
of fossils." 4to Zurich, 1858. One of the maps represents the 
geology of central New Mexico from the Llano estacado to the 
west of Zuni, scale, 1 :900,000. It is not only the first detailed 
geological map of New Mexico, but the only one which gives a 
rational classification and exact distribution of the rocks even 
