A, Winchell on Drift Materials in Michigan. 335 
Heliophylium Eriense Bill., H. exiguum Bill., Cystiphylium Amert- 
canum E. & H., Blothrophyllum decor ens ‘Bill, Diphyph yllum 
Archiact* Bill. » Phillipsastreea Verneuili EK. . P. gigas Owen, 
Cin Acervularia Davidsone* Ki. & H., Toeuti sealari Schlot., 
Orthis een iL, 0. pe: ‘ Takes celia umbonata Con. sp., 
Spirifera gregaria Clap} SS st H., S. acu umainata Con. sp., 
rhynch 
slbcacttula Hall, sp., P yaa Sicat Dal, i impressa H., A. 
aspera? Hall, Meristeila unisulcata Con . sp., Jf nasuta Con., s 
Leptocelia concava enlamerus arains Con., sp., Siricklantia 
elongaia Vanux., sp, Centronella yay fs Hall, sp., Rhynchonella 
Thalia Bill., Lucina proavia Goldf., Conocardium trigonale Hall, 
Sp., Platyceras Thetis H., P.crassum ie . dumosum Con., Platyos- 
toma strophius H., Murchisona Leda Hi, Proetus crassimarginalus 
H., and more than two dozen species ‘which seem to be unde- 
scribed 
wf no reasonable doubt exists that these detached masses be- 
long to the Corniferous limestone, the next question which pre- 
sents itself relates to the region whence they have been derived. 
In view of the facts cited, it is evidently absurd to assume that 
no transportation has taken place; for these masses of Cornifer- _ 
ous limestone are found resting © over the Hamilton cee the 
am 
that they have been BA with the great mass 0 
materials from the northern outcrops of the rocks of this age at 
Mackinac and the surrounding region. irst, the transporting 
agency has not moved masses of other kinds of rocks which at- 
tain to anything like the same dimensions. Secondly, That 
I judge from the condition of the siliceous, 
buss the Hamilton are here included, because ech, in 
_ the same — oh h admitted cos a {and Schoharie grit) 
species. 
Lower Helderberg celia concava is included for the same reason, In af ge 
o eaglaegs just referr to, othe do we experience aay ay difficulty in a 
t constant peculiarities in the Corniferous us species. ichness of the exotic _ 
. Dan fauna of this doeslily, | in ; the number and state of Pilaaheingc of Weis 
far exceeds any that has been signalized by the geologists ts of the Old W: 
