Bulletin of the Geological Society of America . ecesses 313 Southeastward intensity 314 Metamorphism 315 Competency of beds 315 Effect of load 316 Bedding slip 316 Effect in kind of yielding 317 Border faults 317 Height and depth of folds 318 Fan structure 319 Precambrian divergence 320 Triassic trend lines 320 System of batholiths , 321 Precambrian plateau 322 Paleozoic geosynclines 328 Major linear folds 325 : 326 Cross-fold system 328 Southward convergence 329 Northward thrust from Llanoria 329 Relation of cross-folds to salients 330 Age of axes shown 330 Periods of fold
Bulletin of the Geological Society of America . ecesses 313 Southeastward intensity 314 Metamorphism 315 Competency of beds 315 Effect of load 316 Bedding slip 316 Effect in kind of yielding 317 Border faults 317 Height and depth of folds 318 Fan structure 319 Precambrian divergence 320 Triassic trend lines 320 System of batholiths , 321 Precambrian plateau 322 Paleozoic geosynclines 328 Major linear folds 325 : 326 Cross-fold system 328 Southward convergence 329 Northward thrust from Llanoria 329 Relation of cross-folds to salients 330 Age of axes shown 330 Periods of folding 331 Amount of folding 334 Inferences 336 Direction of the deforming force 336 How the deforming force was transmitted 338 1 Manuscript received by the Secretary of the Society July 5, by permission of the Acting- Director, U. S. Geological paper is one of a series composing a Symposium on the structure and history<)f mountains and the causes of their development. (309) BniX. OEOL. SOC. AM. VOL. 34, 1922, PL. 4. GEOLOGIC MAP OP APPALACHL4N REGION 310 A. KEITH OUTLIXES OF APPALACHIAX STRUCTrRE Page Theories as to cause of deforming forces 341 Early theories 341 Contraction 343 Suboceanic spread 345 Isostasy 346 Geosyuclines 351 Continuity relations 353 Continental creep 354 Summary of theories 361 Batholith intrusion as cause of folding 365 General statement 365 Probabilities 366 Analogies 367 Examples 368 Method of attaining horizontal motion 369 Fluid condition 369 Attitude of rock partings 370 Included gases 372 Growing crystals 373 Bearing on other theories 373 Ultimate forces 375 General statement 375 Heat 375 Gravity 376 IXTRODUCTIOX Tlie subject of Appalachian structure is one of the most interestingin geology in that it affords the greatest example of mountain structurein the world. All stages of deformation from undisturbed rocks to bedsfolded, overturned, broken, mashed, and metamorphosed are seenthroughout the entire length of the syst
Size: 1697px × 1473px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
