58 The American Geologist. J«««ary. i9..i. 
Bulletin of the Hadley laboratory of the University of New Mexico. 
Vol. II, part I, 1900. Published with the cooperation of Mrs. W. 
C. Hadley. 
This publication embraces several articles, the leading one being 
devoted to the geology of the "Albuquerque sheet," of the United 
States Geological Survey, with the limits of which lies the terri- 
torial university. Its authors are C. L. Herrick and D. W. Johnson 
It is accompanied by a map and thirty-two plates, mostly of fossils, 
of which fourteen are new or undetermined. The article gives a con- 
venient synopsis of the geological structure of the area included in 
the Albuquerque sheet, with incidental references to the surrounding 
country. The Tertiary forms a large central triangular mesa, extend- 
ing from the Rio Grande to the Puerco, with a gentle general dip to 
the southeast. Volcanic rocks forming cones and flows pierce and lie 
upon the Tertiary, the most notable being the volcanoes a short dis- 
tance west from Albuquerque. These are believed to be a part of a 
series that runs north and south, indicating a line of weakness and 
perhaps of fracture and faulting. It is interesting to note that some 
specimens of maize embraced in what was supposed to be a part of 
this lava were traced to a recent artificial origin, the "lava" being simply 
fused adobe, a part of an abandoned brick kiln. Thus the idea that 
man was contemporary with the lava was abandoned. 
The Sandia mesa rises from the Rio Grande toward the east. The 
inclination is much increased near the Sandia range of hills a spur 
from which enters the area of the sheet. These hills are due to a great 
fault which has brought to the surface the Permian and Carboniferous 
the uplift being on the east side of the fault. This dynamic movement 
was accompanied by metamorphism and apparently by fusion of the 
rocks concerned, giving vent to granite. 
In the Cretaceous of the western part of the area are lignite beds 
which have been considered Laramie but they lie below the Fox 
Hills of the Cretaceous. Some pre-Tertiary igneous rocks that pierced 
the Cretaceous and modified its beds, are found near the Puerco val- 
ley, west of Albuquerque, in the form of isolated trachyte cones, the 
surface lavas of which had apparently been eroded and lost prior to 
the Tertiary covering which has since been also removed by the 
erosion incident to the Puerco valley. The authors gave the petro- 
graphic characters of these rocks and of the Tertiary basalt. 
Short paragraphs are devoted to the building materials, and es- 
pecially the claj-s, and to irrigation. 
Pres. Herrick also discusses in a short article the possibilities of 
salt, gj'psum, cement, clay and graphite, in New Mexico. 
The volume also contains "Report on a geological reconnoissance 
in western Socorro and Valencia counties, New Mexico," and "Identi- 
fication of an Ohio Coal Measures horizon in New Mexico." which 
have appeared in the American Geologist ; also "The GeologA- of the 
White Sands of New Mexico," from the Journal of Geology, and 
closes with "The Cyanide process in New Mexico" by V. V. Clark. 
