812 C. H. GORDON 
glomerate of inconstant thickness (40 feet at the maximum) which 
he calls the Coyote sandstone, from the canyon of that name in the 
south end of the Sandia Mountains. 
THE MANZANO GROUP 
Above the Madera limestone and resting unconformably upon it 
in the Rio Grande region, is a series of red and pink sandstones and 
shales with deposits of gypsum capped by a prominent formation of 
limestone. ‘These red sandstones and shales constitute in part the 
beds usually regarded as the equivalent of the Kansan Red Beds called 
Permian, while some of the upper beds were thought by Herrick to 
be Jura-Trias in age. 
The writer’s observations of these formations, though limited, 
led him to regard them as belonging to the Pennsylvanian series, a 
conclusion fully established by the more detailed studies of W. T. 
Lee,' of the U. S. Geological Survey. The series of variegated sand- 
stone, shale, and gypsiferous beds was described by Herrick? from the 
Manzano Mountains, northeast of Socorro, in 1900, and by him named 
the Manzano series. In the southern part of the region a limestone 
formation several hundred feet in thickness overlies the red beds, and 
from it Lee obtained a large collection of fossils which are distinctly 
allied to those obtained from the red series, the whole, as stated by 
Dr. Girty,3 being distinctly Pennsylvanian, though markedly differing 
from the fauna of the lower, or Magdalena, group. Northward in 
Bernalillo County the upper limestone member is absent, and varie- 
gated sandstone and shale beds, similar to those of the Morrison 
formation, rest upon the pink sandstones, with an intervening erosion 
unconformity.4 Lee considers the Manzano group lithologically 
separable into three divisions, the lowermost of which consists princi- 
pally of dark red sandstones interstratified with red sandy shales and 
some thin beds of bluish-drab earthy limestones. At the base of the 
t Jour. Geol., Vol. XV, pp. 52-58, 1907. 
2 Jour Geol., Vol. VIII, pp. 115, 116, 1900; Bull. Univ. New Mex., Vol. II, Pt. 
1, Fascicle No. 3, p. 4, 1900. 
3 Quoted by Lee, Jour. Geol., Vol. XV, p. 54, 1907. 
4 The description and classification of the Manzano beds is to appear in a forth- 
coming publication by Messrs. Lee and Girty. 
