Box 15, Folder 1: Geolog - Notes 1868

I. A. Lapham's

Geol. Notebook

1868 -or 9

Notes + sketches

About 1868 or 9

3

Sinsinawa Mound

[pen sketch]

Dubuque

Mississippi R. (11 f above L Mich)

121' ft Menomonee

335. f

Quarry

300 x 250 552ft

Level of Lake Michigan 578 ft above the Sea

0 1 2 3 4 5 6 Miles

Profile by Dr. John Lock in Owen's 1st Report (1840) p. 121

[pen sketch]

Am. Exploring Co 476'

College 475.

Sinsinawa 604'

4

3

2

1

Section in Iowa Report I p. 293

1 - Blue Limestone - 2 Galena Limestone-3, Shale ,- 4 Niagara Limestone

4

Prairie du Chien (Dr Lock)

[pen sketch]

A

519

Soil + Limestone 60

459

Blue Limestone 115

344

Buff Limestone 20

324

Upper Sandstone 40

284

Limestone 40

244

Lower Magnesian Limestone. 190

54

Sandstone 54

Island

Mississippi River 24 ft above L. Mich

Prairie du Chien

Level of L. Michigan

Dr. Lock's Section (Owin 1st Rep. 1840 p.122)

---

Upper Sandstone 80feet, - Hall p. 26.

92 ft (Shumard) at St Anthony

---

Whitneys Section Report p 147

Blue limestone 50 ft

Buff " 18

Upper Sandstone 82

Lower Magnesian 221 to 250

Thence to River (Potsdam) 60

---

460

5

Prairie du Chien (Whitney)

[pen sketch]

= 455

50

b' = 405

Buff 18

u = 387 Differs 53 from Locks

82

m = 305

Lower Magnesian

221.0

p = 84 = 84

Potsdam S

60

supposed 600 ft thick (a =516)

[pen sketch]

Pr. du C

387 A.

50

Strike S 75o E Level

Slope 13 ft pr mile

20

S 15o W

Dip 20 ft pr m.

Miss Beetown Mineral Point

A 9 0 109A 36 400A

20 Rise 9 ft pr mile

9

To fine u at Beetown

Miss. with its dip + strike.

00 A