IOWA ACADEMY OP SCIENCE 
163 
which separate the Sierra Osciira and the Guadalupe range, which I have iioi 
yet been over thoroughly, a grave question arises as. to what becomes of the 
red Bernalillo shales and sandstones. I have fancied sometimes that the 1,500 
feet of Richardson’s Delaware Mountain sandstone (Eddy sandstone) which im- 
mediately overlies the dark Hueco (Maderan) limestones is the southern con- 
tinuation; but of this there is as yet no strong proofs. 
I had also thought that I had traced the Cimarronian Red-Beds of western 
Kansas and northwestern Texas up the Canadian River valley and down the 
Pecos valley, around the great escarpment of the Llano Estacado, to the vicinity 
of the Guadelupe mountains where presumably they rested on the Guadelupe 
limestone. While on account of the extensively faulted character of the area 
it may take further field work, in order to determine this point beyond all 
question there has yet appeared no valid grounds for believing that these 
Red-Beds underlie the Guadalupe limestones. 
The existence of a dark limestone, 800 feet in thickness, above the Berna- 
lillo shales, as urged by Lee* and by Gordont I very much question. There 
will have to be very much better testimony adduced before their ascertion can 
be accepted. My own observations have been strongly to the contrary. I am 
quite familiar with all of the localities mentioned by both of the authors named. 
In every instance there seems to be very clear evidences of profound faulting 
which has raised, as it were, the lower limestones above the outcropping level 
of the red shales. In the San Filice range, east of Socorro, the fault has been 
tested by the drill and a displacement of nearly 1,000 feet found, yet along the 
faultline there is practically no bending of the strata. Similar apparent fault- 
ing back of the Sandia and Manzano ranges, v^^here Lee states that the great 
upper dark limestone is missing, brings the lower limestones above the level 
of the same shales, in the same way as it does in the Caballos, Oscura and San- 
Pilice ranges. Small wonder is it that Girty comments with surprise upon the 
similarity of the fossils which were collected for him from the limestones be- 
neath the Bernalillo shales and the alleged limestone above. 
Late Carbonic time is represented in the Rio Grande region by the great 
Guadalupan series of limestones, the faunas of which were early described by 
Shumardt and later by Girty§, but which have no counterparts elsewhere on 
the American continent. Their affinities are Avith the original Permian series 
of Russia.** The other Late Carbonic representative is the true Cimarronian 
series of Red-Beds of Kansas, separated from the Triassic red-beds by marked 
unconformitytt. 
*Journal of Geology, Vol. XV, p. 54, 1907. 
tibid., p. 816, 1907. 
tTrans. St. Louis Acad! Sci., Vol. I, p. 280, 1860. 
§Univ. Texas Min. Sur., Bull. 9, p. 40, 1904. 
**Journal of Geology, Vol. VII, pp. 321-341, 1899. 
ttAm. Jour. Sci. (4), Vol. XX, pp. 423-429, 1905. 
