SUBJECT INDEX 



687 



Fahlband type of ore deposits, 535 

 Failure, by rotational shear slip, 237 

 of slope and foundation, 95, 108, 137, 



144, 157, 171, 241 

 Fairbanks, Alaska, 269 

 Fall-line harbors, 293 

 False River, La., 216-219 

 Fans, alluvial, 26, 129, 336, 449, 643 

 Farming in permafrost, 266 

 Fast-raveling ground in tunnels, 194 

 Fat clays, 221, 224 

 Fathometers, 353 

 Faults, 158, 237 



detected by geophysics, 83 

 effect of, on foundations, 151, 161 

 on landslides, 238 

 Feldspar, 33, 55, 441, 464, 475 

 Ferrells Bridge, Tex., 220 

 Ferric compounds, 509, 542 

 Ferrous compounds, 508, 542 

 Ferruginous cement, 161 

 Ferruginous sediments, 519, 521 

 Fertilizer, 366 



Fetches, effect of, on dams, 191 

 Field-bearing-test method, 143 

 Field testing, 99, 156, 162 

 Fillers made from clay, 472 

 Filter blankets in dams, 187, 191 

 Filter sand, 489 

 Filtering capacity of soils, 638 

 Filtration coefficient, 652 

 Fine-grained sedimentary rocks, 19-25, 



161-164, 219 

 Fineness of foundry sands, 476 

 Fire, effect of, on erosion, 339 

 Fire clay, 476, 478, 490 

 Fire Island Inlet, 280-282 

 Firing of clays, 469 

 Firm ground in tunnels, 194 

 Firmness of sea bottom, 659 

 Fissured clays, 107, 238 

 Five-Mile Creek, Wyo., 411 

 Fixation of atmospheric nitrogen by soil 



bacteria, 53 

 Flagging, 490 

 Flame photometer, 622 

 Flash floods, 408; see also Sheet erosion 

 Flats, tidal, 24 



Flexible-hinge design for bridges, 175 

 Flint, 131 

 Flip-up bucket, 182 



Flocculation, 57, 109, 310, 608 

 Flood, 222, 319, 338 



in dams, 220, 226 

 Flood control, 325 



dams for, 188 



reservoir for, 397 



structures for, 191, 220, 398, 425 

 Flood-damage-frequency studies, 392 

 Flood erosion, 386 

 Flood flows, 327 

 Flood-plain deposits, 25, 131, 207, 212- 



218, 393-396, 449 

 Florida, 24, 122, 123, 276, 512, 525 

 Flow, 135 



in stream walls, 62-71 

 Flow-moment slides, 135, 223, 236 

 Flow net, 104 



Flowability of foundry sands, 479 

 Flowing ground in tunnels, 194, 195, 202, 



205 

 Fluid flow, 586 



Fluids in porous media, 85, 117, 579, 630 

 Flume and model experiments, 69, 70, 



300, 661 

 Fluorescence of reservoir fluids, 85, 567 

 Fluorite, 528, 530, 532 

 Fluvial deposits, 129, 220, 481; see also 



River deposits 

 Fluvioglacial deposits, 207 

 Folkestone, England, 233 

 Fontana Reservoir, 352, 360 

 Footings in bridges, 174 

 Foraminifera, 510, 571 

 Fore-set beds, 12 

 Forepoling in tunnels, 206 

 Forest, soil erosion in, 388 

 Forest fire, effect of, on erosion, 376 

 Forest soil, 52, 53, 399 

 Fort Apache, Ariz., 420 

 Fort Bayard Military Reservation, 421 

 Fort Benning, Ga., 645 

 Fort Laramie Canal Intake, 379 

 Fort Peck Dam, 164, 185, 331 

 Fort Randall Dam, 190 

 Fort Union formation, 163 

 Fossils in permafrost, 256 

 Foundations, 75, 147, 171, 182 



dam, 149, 156, 181-192, 265 



depth of, 174 



geologic problems of, 149 



highway-bridge, 169-180 



