xlvili THE PALEONTOLOGY OF MINNESOTA. 
First report, 1872. The results of a general reconnoissance of the southern portion of 
the state are given in the first report; this statement includes detailed sections of the 
stratigraphy supposed to cover the whole of the Lower Silurian so far as known to exist 
in the state, with mention of the distribution of some of the fossils. The Hudson River 
was not identified. 
Second report, 1873. Contains simply a section of the stratigraphy near Farmington, 
in Dakota county. 
Third report, 1874. Gives a brief account of the ‘‘Silurian”’ in the northeast corner of 
Mower county. 
Fourth report, 1875. Containing the geology of Fillmore, Olmsted and Dodge counties, 
deals largely with the Lower Silurian, especially in its effect on the topography in the 
eastern part of the county where the drift is thin or wanting. 
Fifth report, 1876. Gives the geology of the Lower Silurian in Houston and Hennepin 
counties. 
Sixth report, 1877. Contains observations on the Trenton at Wanamingo, in Goodhue 
county, and at St. Paul, in Ramsey county, also in Rice county. 
Highth report, 1879. Ten species of brachiopoda are here described, supposed to be 
new, from the rocks of the Lower Silurian in Minnesota. 
Ninth report, 1880. Three new brachiopods are described in this report. 
Twelfth report, 1883. Contains a description of a new trilobite, by A. W. Vogeles, 
assumed to have come from the Trenton, but shown by Prof. Clarke in part 11 of this 
volumeto have been derived from the middle Devonian. 
Fourteenth report, 1885, This contains a ‘‘report on the Lower Silurian Bryozoa, with 
preliminary descriptions of some of the new species,’ embracing forty forms; also ‘‘re- 
marks on the names Cheirocrinus and Calceocrinus, with descriptions of three new generic 
terms and one new species.” 
Fifteenth report, 1886. Three species of trilobites, two of them new, are here described 
from the Trenton limestone by Mr. A. F. Foerste. 
Nineteenth report, 1890. ‘*New Lower Silurian Lamellibranchiata, chiefly from Minnesota 
rocks.” Contains descriptions of 28 new forms. 
Volume 1, Final report, 1872-1882. In this volume are the final reports on the counties of 
Houston, Winona, Fillmore, Olmsted, Dodge, Steele and Rice, in all of which these forma- 
tions occur, with maps of their surface distribution. 
Volume Il. Final Report, 1882-1885. Here are given the final reports, with county maps, 
on the geology of Goodhue, Dakota, Ramsey and Hennepin counties. 
Bulletin No. 5. Natural Gas in Minnesota, 1889, N. H. WINCHELL. A record is given 
of the deep well sunk at Freeborn, in Freeborn county. Here the Galena limestone is given 
at 10 feet, being the first rock struck below the drift. ‘The shales and underlying Trenton 
are given a thickness of 310 feet, which may be considered doubtful. 
