The Mesosoic Series of New Mexico. — Marcou. 221 
IV.— Rectification to Table I, for the upper Cretaceous of New 
Mexico; made in 1S63, by J. Marcou. 
Upper 
Cretaceous 
or White 
Chalk 
of 
New 
Mexico. 
Albuquerque 
and 
Puerco 
area. 
Galisteo 
area. 
c. White sandstone, witli Ammonites 
novi mexicani, Baculites and Inocera- 
mus. It forms the whole mesa be- 
tween AlbiKjuerque and the Rio 
Puerco.— Lately, 1888, Mr. J. Collett, 
of Indianapolis, has discovered south 
of Albuquerque, at Carthage, near 
Socorro, in the continuation of the 
white sandstone an Ammonites Icnticu- 
I laris Meek, of the Fox Hill group of 
t the upper Missouri basin. 
b. Black marl and sandy limestone with 
Inoceramns lerouxi. Ravine of the Rio 
Galisteo, at the crossing of the road 
from Santa F6 to Sanfelipe : — It rep- 
resents the Colorado group, 
a. Gray sandy marls, with Ptychodus 
^vhipplei, Ammonatis pcrcarinatus, In- 
oceratnus prohlematicus, and Ostrea 
congesta; north of Galisteo, lying in 
discordance of stratification over or 
against the white and yellow Jurassic 
i sandstone. — It represents the Dakota 
[ group of Iowa City and Nebraska. 
1867. LeConte. The entomologist, John L. LeConte, during 
a survey for the Union Pacific railway, touched my road by 
the 35th parallel, from the Rio Pecos above Cuesta, to Canon 
Blanco, Tigeras, and Albuquerque. In his report : "Notes 
on the geology of the survey for the extension of the Union 
Pacific railway, E. D., from the Smoky Hill river, Kansas; to 
the Rio Grande," pp. 30-36, Philadelphia, 1868, he says, speak- 
ing of the rocks he saw in the Pass called Puertocito del Padre, 
in ascending the bluff from the Rio Pecos, to the mesa due 
east of Galisteo : "The section of a mesa of Cretaceous sand- 
stone underlaid by the marl series of red, white and greenish 
strata of the Trias. Whether there be any Jurassic strata 
between the Trias and Cretaceous has not been ascertained" 
, . . . "it is very probable that the upper beds of the marl 
series may be eventually classed with the Jurassic." No 
fossils and no geological map, or exact section, are given. 
1869. Haydex. Dr. Hayden in his " Third Ann. Report, 
pp. 165-166, Washington, 1873, says : "I am inclined to the 
belief that in the mesa, which looks so conspicuous on our 
left, on the road to Santa Fe (from old Pecos church), we 
have the first series of variegated beds, or Jurassic, including 
