Bulletin of the Scientific Laboratories of Denison University. 
Vol. XI. Article IX. With a Map and Plates XXVII-LVIII. June. iqoo. 
T'lF- GEOLOGY OF THE ALBUQUERQUE SHEET.' 
By C. L. Herrick arid D. W. Johnson. 
In pursuance of the plan outlined in the first volume of 
this series we present the first instalment of detailed geology of 
the territory. The area selected is that covered by the United 
States topographical “Albuquerque Sheet” surveyed in 1888. 
The topography upon this map is by R. H. Phillip and W. W. 
Davis of the United States topographical corps. We desire 
particularly to acknowledge the courtesy of the Director of the 
United States Geological Survey by whose permission the con- 
tours from the Albuquerque sheet have been used upon our 
map. Dr. Walcott also kindly enabled us to reproduce a num- 
ber of the plates of Cretaceous fossils from the report of Mr. 
Stanton in Vol. 106 of the Bulletins of the Survey. For this and 
other courtesies at the hands of the survey we here desire to 
make acknowledgement, as well as to Mr. W. F. Cummins of the 
Texas survey, Professor Charles S. Prosser of the Ohio State 
University, the directors of the geological surveys of Illinois and 
of Minnesota, and especially to Messrs. H. O. Brooks and T. 
A. Bendrat, of the volunteer corps of our survey. 
It is no disparagement of the excellent topographical work 
which has been done by the United States survey to admit that 
the present sheet, as one of the earliest to be completed, is not 
entirely reliable and may be employed with safety only in following 
the main topographical outlines. These inaccuracies, are, how- 
ever, of less importance upon this sheet than in most parts of the 
^ Appearing simultaneously in the Bulletin of the Scientific Labora- 
tories OF Denison University, Vol. XI, and the Bulletin of the Univer-, 
siTY OF New Mexico, Vol. II. 
