Drift in Minneapolis^ Mi?in. — Uphajn. 2^"^ 
Machrochilina keyesi (nov. sp.). 
Figs. 65, 66. Lateral views of two different specimens, natural size. 
Zaphrenfis capiiliformis (nov. sp.). 
Figs. 67, 68. Lateral and calix views of one of the types. 
Fig. 69. Calix view of another specimen. 
Fig. 70. Same specimen as Fig. 69, side inverted view, X Yt. 
Cyathaxoiiia ivinchelli (nov. sp.). 
Fig. 71. Side view of a large specimen, natural size. 
Fig. 72. A smaller specimen, side view, natural size. 
Fig. 73. Calix view, natural size. 
GLACIAL AND MODIFIED DRIFT IN MINNEAPO- 
LIS, MINNESOTA.* 
By Waeeen Upham, St. Paul, Minn. 
(Plates VI and VII.) 
CONTENTS. 
Description of the area 274 
Table of elevations 27.i 
Rock formations under the drift 276 
Interglacial and postglacial river erosion 278 
Glacial striae 279 
Changes of glacial currents 280 
The glacial lake Hamline 281 
Departure of the ice-sheet from this area 282 
Relations of the northeastern and northwestern drift 283 ■ 
Sections shown by street and railway grading 284 
On Superior avenue 284 
On Western avenue 286 
On Penn avenue 287 
Southwest of Crystal lake 288 
On the New Brighton road 288 
Evidences of englacial transportation of the drift 289 
Till and marginal moraines 289 
Moraine of the reservoir, Silver lake, and St. Anthony park 290 
Moraines west of Minneapolis 290 
Plains of modified drift 291 
Channels of drainage from the melting ice-sbeet 293 
Basins due to unmelted ice masses 294 
Comparison with plains of Cape Cod 294 
Esker ridges and hills 294 
Series includ ing Lowry hill 295 
Masses of till in esker gravel 29.5 
Series from lake Amelia to lake Harriet 296 
The chain of lakes 297 
Comparison witli other lake chains in Minnesota 298 
In Martin county 298 
In Crow Wing, Cass, and Hubbard counties 298 
Review of the Glacial history "299 
*Presented before the Geological Society of America, August 22, i8qq. 
