Annual Report for ... with Accompanying Papers

Iowa Geological Survey

Published for the Iowa Geological Survey, 1916 - Geology

Contents

• THE IRON ORE DEPOSITS NEAR WAUKON IOWA BY JESSE V HOWELL: 33
• Stratigraphic geology: 41
• Structural geology: 53
• Economic geology: 63
• FIGURES PAGE 10 Ideal section showing development of bowlders by decay of limestone: 78
• General view of ironore concentrating plant: 85
• Bibliography of the Waukon iron ore: 92
• PLATES PAGE I Chert nodules from iron ore: 95
• Fossils from iron ore and from Decorah shales: 97
• Fossils from the iron ore: 99
• Pieces of ore showing cavity and fossils: 101
• PLEISTOCENE HISTORY OF IOWA RIVER VALLEY NORTH AND WEST OF IOWA CITY: 103
• Introduction: 107
• Topographic map of Fairfax quadrangle Iowa: 108
• Map of Johnson county showing location of well records collected: 110
• Map of Johnson county showing wells probably in Aftonian and Nebraskan: 115
• Cross section of preglacial surface buried by drift: 117
• North face of interurban cut west of Iowa City: 121
• Map showing Buchanan gravel in Johnson county: 124
• Crossbedded Buchanan gravel near Black Springs: 125
• Map showing lobes of Iowan drift in Johnson county: 127
• View of the North Liberty Plain: 129
• View showing erosional topography of the Kansan: 131
• View of the terrace in Pardieu creek: 135
• View of terracelike feature at the Helman sand pit: 137
• View showing upper part of aqueous sand and silt grading up into loess Helman sand pit: 139
• View showing topographic setting of the Interurban cut near upper Interurban bridge: 143
• View showing folded and contorted Buchanan gravel: 145
• Conclusions: 147
• Topographic map of Fairfax quadrangle Iowa: 151
• Cross sections of Iowa river valley: 152
• View across wide segment of Iowa river valley: 153
• Profile showing elevation of bedrock: 156
• Cross section of gorge east of North Liberty: 157
• Part of Fairfax topographic map: 159
• View showing potholes at Lovers Leap: 161
• A sinuous eddyscar on top of the valley wall: 162
• Events attending the development of Iowa River valley: 163
• Lansing Michigan topographic map: 164
• Fairfax Iowa topographic map: 165
• Diagram showing changes in gorgecutting: 166
• Records of wells in Johnson county and adjacent townships: 169
• TRILOBITES FROM THE MAQUOKETA BEDS OF FAYETTE COUNTY IOWA BY ARTHUR: 183
• Diagrammatic figure of a trilobite: 189
• Views of Isotelus iowensis: 239
• Views of Bumastus beckeri Megalaspis beckeri Thaleops ovata and Nileus vigilans: 240
• Views of Sphaerocoryphe maquoketensis Amphilichas rhinoc eros and Amphitichas clermontensis: 243
• Views of Cybeloides iowensis Encrinurus pernodosus and Calymene fayettensis: 244
• Views of Ceraurus milleranus Ceraurus elginensis and Ce raurus icarus: 247
• Views of Pterygometopus fredricki Pterygometopus larrabeei and Calymene gracilis: 248
• Introduction: 257
• Historical Review: 264
• Experimental Evidence: 296
• Field and Chemical Evidence: 318
• Bowlderlike masses of dolomite in limestone Alton Illinois: 360
• Irregular lens of dolomite in limestone Alton Illinois: 361
• Relations of dolomite to limestone Belfast Iowa: 365
• Reef of unaltered brecciated limestone Bonaparte Iowa: 366
• Irregular boundary between limestone and dolomite Farmington Iowa: 370
• Lateral gradation of dolomite into limestone Harrisburg Pa: 372
• Tribes Hill limestone Palatine Bridge New York: 410
• Mottled limestone from same locality as above: 411
• Later stages in alteration same locality as above: 413
• Mottled Galena limestone Elkader Iowa: 415
• Microphotographs of partly altered limestones and dolomites various localities: 417
• Microphotographs of mottled limestone from Palatine Bridge New York: 418
• Microphotographs of limestones and dolomites: 421
• PHYSICAL FEATURES AND GEOLOGIC HISTORY OF DES MOINES VALLEY BY JAMES: 423
• Outline map of southern Minnesota and Iowa: 428
• The Geology of the Region: 436
• General geological section of Iowa: 438
• Geological section from Baraboo Wisconsin to Des Moines Iowa: 439
• Geological map of lowa: 443
• Map of the drift sheets of Iowa: 453
• The Work of Running Water: 459
• Map of southwestern Minnesota: 465
• Map of Des Moines valley state line to Fort Dodge: 467
• Profiles across East and West Forks of Des Moines valley to face: 468
• Views of Tuttle lake East Fork at Bancroft and Buffalo creek: 469
• A Union slough at its mouth B East Fork near Buffalo creek: 475
• The rock wall on Silver lake Minnesota: 479
• The wide valley of the East Fork near Algona Iowa: 483
• PLATES PAGE XXXVIII The West Fork in Minnesota and at Estherville Iowa: 491
• A The moraine at Estherville B Wide valley near Ottosen: 497
• Kansan blue clay beneath gravels at Estherville: 499
• Gravel pit in the valley train at Graettinger: 500
• Maps of the flood plain of the West Fork in Palo Alto county: 502
• Kinderhook limestone at Rutland bridge: 504
• The West Fork near Humboldt with its gravels: 505
• Des Moines Valley Below the Forks: 510
• A The valley above Fort Dodge B Bench near Kalo: 511
• Map of Des Moines valley Fort Dodge to Des Moines: 515
• Vews of Boone river: 517
• Topographic map of northern part of Boone quadrangle: 519
• Narrow gorge and terraces in valley above Boone: 521
• Short ravines and pond on the plain above Boone: 523
• Topographic map of northern part of Boone quadrangle: 525
• Gary moraine and a Wisconsin bowlder in Boone county: 527
• The Ledges Boone county: 529
• Topographic map of northwestern part of Madrid quadrangle: 531
• Topographic map of southern part of Madrid quadrangle: 533
• Pond and kames near the valley: 535
• Topographic map of northern part of Des Moines quadrangle: 537
• Topographic map of southern part of Des Moines quadrangle: 539
• Discussion of Conditions: 540
• Section across Boone and Greene counties: 541
• Preglacial drainage at Des Moines: 542
• PreWisconsin drainage at Des Moines: 543
• Postglacial drainage at Des Moines: 544
• Profile of gorge of Des Moines river at Des Moines: 546
• Pit of Iowa Pipe and Tile Co Des Moines: 549
• A Sandstone on Capitol Hill B Raccoon river above Des Moines: 553
• Todds Preglacial Niobrara River: 557
• Map of Des Moines valley Des Moines to Ottumwa: 559
• Topographic map of part of Milo quadrangle: 561
• Topographic map of part of Knoxville quadrangle: 563
• A Des Moines river above Dunreath B Saint Louis beds near Tracy: 565
• Red Rock bluffs near Red Rock: 567
• Topographic map of part of Pella quadrangle: 571
• Des Moines and Muchakinock valleys above Eddyville: 573
• Map of Des Moines valley Ottumwa to Keokuk: 577
• Sandstone bluffs at Cliffland: 579
• A Bluff at Cliffland B Shales and sandstones below Cliff land: 581
• Wide valley of Des Moines river near Eldon: 583
• Wide and narrow segments of valley at Selma: 585
• Topographic map of Keosauqua oxbow: 587
• Topographic map of part of Kahoka quadrangle: 589
• Narrow flood plain below Croton: 591
• The wide valley near Vincennes and St Francisville: 593
• Erosion in old valley filling near Connables: 595
• Map showing drainage changes in southeastern Iowa: 598
• Topographic map of vicinity of Burlington: 599
• Section across present and former valleys of Mississippi river in Lee county: 601
• Bibliography of Des Moines Valley: 606

Bibliographic information

• Title: Annual Report for ... with Accompanying Papers; Iowa geological survey; Volume 25 of Reports and Papers, Iowa Geological Survey
• Author: Iowa Geological Survey
• Publisher: Published for the Iowa Geological Survey, 1916
• Original from: the University of California
• Digitized: Mar 22, 2013