NOTES ON NEW NAMES IN TABLE OF FORMATIONS AND 
ON PHYSICAL EVIDENCE OF BREAKS BETWEEN 
PALEOZOIC SYSTEMS IN WISCONSIN 
E. 0. Ulrich 
Introductory note hy TV. 0. Hotchkiss. The Geological^ and 
Natural History Survey of Wisconsin is deeply indebted to the 
writer of this paper, and to the United States Geological Survey 
for the cooperation which has made possible the important results 
set forth. The field work on which Dr. Ulrich’s work is based be¬ 
gan in 1913 and has been carried on during short periods of a few 
days or weeks each summer since, as the pressure of his other duties 
permitted. The work has added greatly to our knowledge of the 
Paleozoic formations, and -while this is more than ample justifi¬ 
cation, it is satisfying to record that the results have been imme¬ 
diately applicable to economic uses as w^ell. The successful search 
for local supplies of shale for road surfacing in western Wiscon¬ 
sin would have been impossible without Dr. Ulrich’s work as a 
basis. The guidance of drillers of deep wells and the close identifi¬ 
cation of the strata in these wells which has made possible the find¬ 
ing of desirable water supplies also rests largely on the results of 
his work. 
Dr. Ulrich’s work has resulted in very much more detailed 
knowledge of the strata and has shown the need for giving names 
to the new units recognized. It has also been deemed advisable 
in his paper to discuss somewhat fully the physical evidence on 
which the limits of the various formations are determined. 
The Burroughs Dolomite 
Near the top of Bur rough’s Bluff, at the northern end of Savan¬ 
nah, Ill., and also in and above Charles Miles’ quarry near the 
southeastern edge of the same city the easily recognized Brainard 
shale at the top of the Maquoketa facies of the Richmond group is 
succeeded unconformably by a variable succession of bluish to 
*Published by permission of the Director of the U. S. Geol. Survey. 
