irman.] SHARON SILURIAN. 199 
lurian rocks; Kugruk groupof Alaska, Seward Peninsula, northwestern portion. PP2, 
pp 21-24 
Lone .Mountain limestone of Nevada Bull 208, p 20 
Lower Helderberg series of Ohio Ann 8, n, pp 499, 507 
Lower Magnesian group of Illinois : GF 81, p 2 
Lower Magnesian limestone in Wisconsin Ann 7, p 394; Ann 11, i, p 332 
Medina group in Erie and Ohio basins Mon xli, p 54 
Medina shale, clay derived PP 11, p 51 
Mocassin limestone of Tennessee GF 75, p 3 
Monroe formation of Michigan Ann 22, in, p 645 
Niagara group in Erie and Ohio basins Mon xli, pp 54-55 
of Illinois GF 81, pp 2-3 
Niagara limestone of Ohio Ann 8, u, p 499 
of Ohio, thickness of Ann 8, ir, p 548 
Nome series of Alaska, Seward Peninsula, northwestern portion. .PP 2, pp 17-24 
of Georgia, Rome quadrangle GF 78, p 3 
of Illinois, Chicago district GF 81, pp 2-3 
of Indian Territory, Atoka quadrangle GF 79, pp 3-4 
of Indiana Ann 11, i, pp 625-634 
of Iowa, northeastern Ann 11, i, p 334 
of Minnesota Ann 11, i, p 332 
of Montana, Elkhorn district Ann 22, n, ] i 438 
of Nevada Ann 2, pp 22 (map), 28 
south of fortieth parallel Bull 208, passim 
of New Jersey, New York City district GF 83, p 4 
of New York City district GF 83, p 4 
of Ozark region Ann 22, n, pp 79-82 
of Tennessee, Maynardville quadrangle GF 75, pp 2-4 
of Wisconsin Ann 11, i, p 332 
Oneota limestone in Iowa Ann 11, i, p 332 
Onondaga series in Erie and Ohio basins Mon xli, pp 55-56 
Pogonip formation or limestone of Nevada Ann 4, p 229; Bull 208, p 21 
Point Pleasant beds of Ohio Ann 8, n, pp 550-551 
Polk Bayou limestone of Ozark region Ann 22, n, p 81 
Port Clarence limestone of Alaska, Seward Peninsula, northwestern por- 
tion PP 2, pp 17-21 
Potsdam sandstone in Mississippi Valley Bull 8, p 49 
Rockmart slate of Georgia GF 78, p 3 
Rock wood formation of Georgia GF 78, p 3 
of Tennessee GF 75, p 3 
Roubidoux sandstone of Ozark region Ann 22, n, p 82 
Saccharoidal sandstone of Ozark region Ann 22, n, pp 80-81 
St. Clair limestone of Ozark region Ann 22, n, p 82 
St. Croix sandstone in Minnesota Ann 11, i, p 332 
St. Peter group of Illinois GF 81, p 2 
St. Peter sandstone of Minnesota Ann 11, i, p 332 
of Mississippi Valley Bull 43, p 49 
of Wisconsin Ann 11 , i, p 332; Bull 8, pp 15, 16, 41-42 
Salina formation in Erie and Ohio basins Mon xli, pp 55-56 
Sevier shale of Tennessee GF 75, p 3 
Shakopee limestone of Minnesota Ann 11, i, p 332 
shales of Maryland PP 11, p 135 
Simpson formation of Indian Territory GF 7V), p 3 
