6 Indiana Natural Gas Field. — Leverett. 
Table of genera and species of echinodermata in the geological 
formations of North America. Trans. St. Louis Acad vol. ii, No. 3. 
p. 401. 
Dr. Shumard's contributions to the report of Dr. Evans on the geolo- 
gy, topography and resources of Oregon has never been publi.shed. 
Dr. Erans died soon after its completion. He was engaged on the 
work actively for five years. Evans' report was ordered printed by 
Congress in 1860 but there seems to have been some informality in the 
execution of the proper order. Shumard closes his sketch of Evans 
(1861) as follows : "It is earnestly hoped that Congress will, at an ear- 
ly period, make the necessary provision for the printing of this impor- 
tant document, the preparation of which has cost such a large expendi- 
ture of labor and money, and which promises to be of the highest value 
to science and the people for whose benefit the survey was ordered." 
Trans. St. Louis Acad. vol. ii, p. 164. 
STUDIES IN THE INDIANA NATURAL GAS FIELD. 
By Frank Leverett. 
The excitement occasioned by the discovery of natural gas in 
the Trenton limestone at Findlay, Ohio, in 1884, has resulted 
in such a honey-combing of the strata of Indiana. Ohio, and 
southern Michigan by deep gas boring as would scarcely have 
been dreamed of five years ago. More than 250 borings made 
in Indiana have reached the Trenton limestone, and several 
have been pushed to still greater depth, some even to the un- 
derlying sandstone. It is obvious that the more numerous are 
these borings, the more complete is our knowledge of the hith- 
erto concealed strata and their products. Minor phases of 
structure or topography and isolated gas or oil belts which the 
first few borings failed to reveal, are being brought to light as 
the borings increase in number, and generalizations made 
when the borings were few, must in many instances be quali- 
fied as they multiply. It is not the aim of this paper to de- 
velop theories and principles ; its value lies in the fullness of 
the data collected, and in the compactness of their arrange- 
ment which renders comparison easy, thus bringing out their 
significance in a manner not possible to a loose arrangement. 
The well-sections here given, so far as they are not assigned to 
other authorities, were collected incidentally by the writer 
while making a study of the glacial phenomena in the vicinity 
of the gas field. Since our study was carried through every 
township of the area, it aff'orded excellent opportunity for col- 
lecting the records of the gas borings. Lack of time, however, 
prevented a thorough examination of suits of specimens which 
in a few instances had been preserved. The records of many 
