go The American Geologist. Fohmary, i898 
Little Tebo creek, which was formerly tributary to Grand 
river, now flows into the Osage, reaching the latter by flowing 
up the abandoned valley for about a mile and a half. Another 
small stream, formerly tributary to Grand river at a point 
about two miles below the old mouth of Little Tebo, is now a 
tributary of the latter, turning up the old valley rather than 
down it. This stream could reach the Osage in just about the 
same distance that is now flows to reach it, by turning down 
the old valley. 
THE GEOLOGY OF THE KEWEENAWAN AREA IN 
NORTHEASTERN MINNESOTA. 
Hy A. H. Et.ftman, Minneapolis. 
(Plate XI.) 
SYNOPSIS. 
Part l.—Glavial Geology. 
General statement, moraines, non-morainic till, modified drift, wind deposits 
distribution of boulders, glacial striw, glacial lakes and rivers, glacial 
erosion, 
I'AKT Il.~Geolo(/j/ of the Keweenaioan Series. 
Chapter 1.— Stratigraphy. 
1. Historical review. 
2. Results of the present investigation. 
Cliapter II.— Faulting in tlie Keweenawan Series. 
Chapter III.— The Gabbro Group. 
Surface area, age, structure, differentiation varieties, mineral and chemi- 
cal composition, contact phenomena. 
Chapter IV. — The Beaver Bay Diabase Group. 
1. Diabase, diabase porphyrite, etc. 
2. Anorthosytes of the north shore of lake Superior. 
3. Fragmeutal rocks. 
Chapter V.— The Red Rock Group. 
1. Intrusive; granite and augite syenite. 
2. Surface flows ; quartz- porphyry , aporliyolite. 
Chapter VI.— Tlie Temperance River Group. 
1. Unconformity. 
2. Surface flows; diabase, etc. 
'A. ■ Intrusive, 
4. Sedimentary ; conglomerate^ sandstone, etc. 
Clmpter VII.— The Later Diabase Group. 
Dikes, sills,' breccia. 
Chapter VIII. — Summary and fliscussion. 
