BULL. GEOL. 80C. AM. 



VOL. 11, 1899, PL. 9 



Figure 1.— Four Maps, each containing one-fourth of the Earth, to lessen Distortiox 



[nner spherical triangles in pencil lines represent position of ideal continents on 

 assumption of perfect symmetry and equality of land and water surfaces. (Green.) 



Archean shields or protaxes shaded, and adjacent ancient unfolded tablelands and 

 corresponding Archean-Paleozoic unfolded tablelands in southern hemsphere lined. 



Figure '2. — Four Maps, each containing one-fourth of the Earth, to avoid Distortion 

 inner triangles show positions of ideal oceans assuming land and water equal. (Green.) 



FOUR MAPS ILLUSTRATIVE OF TETRAHEDRAL EARTH 



