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BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



GOLDTHWAIT : 



Figure 

 Leonard : 



Figure 



Barrell : 



Figure 

 Barrell : 



Figure 



Prouty : 



Figure 



Schuchert : 

 Figure 



Page 



1 — Carroll district, showing outwash deposits 281 



1 — Map showing old Pleistocene valleys of western North 



Dakota 297 



1— Geography of the British Isles in Devonian time 347 



1 — Diagrammatic side view, respiratory-circulatory system 



of vertebrates 420 



2 — Diagrams illustrating a possible mode of evolution of 



air-breathing 432 



1 — Idealized section, showing marble-schist contact high 

 above the drainage lines as represented in some areas 

 of the Vermont marble deposits 439 



2 — Idealized section, showing the less elevated position of 

 the marble-schist contact above the drainage in the 

 Georgia marble deposits 439 



3 — Idealized section, showing the topographic relations of 

 schist, marble, and dolomite in the Alabama marble 

 deposits 439 



4 — Diagrammatic representation of minor offsets in the 



marble deposit 441 



5 — Schistose marble from near Taylors Mill 442 



6 — Photomicrograph of schistose marble from near Taylors 



Mill 443 



7 — Diagrammatic presentation of jointing in a portion of 



one of the quarries in the Alabama marble 444 



8 — Photomicrograph of the commercial grade of Alabama 



crystalline marble magnified fifty diameters 445 



9 — Diagram of schist lines in block of marble at variance 

 with general bedding direction, due, it is thought, to 

 differential movements in the layer because of drag. . 445 

 10 — Diagrammatic representation of a slab of marble taken 



from block at right angles to the bedding plane 44G 



11 — Cross-section through marble valley at right angles to 



strike 446 



12 — Section through marble valley at right angles to strike. 446 

 13 — Section through marble valley at right angles to strike. 447 

 14 — Section from the Knox dolomite area just to the west 



of the main marble belt 447 



15 — View looking nearly west into Gantts quarry 449 



1 — Paleogeography (and glaciated areas) of early Permian 



time 494 



2 — Diagram showing the time and extent of the known 

 floods that have inundated North America since the 

 close of the Proterozoic era 496 



