IOWA ACADEMY OF SCIENCES. 105 



border of Kansas. The formation includes also a part of the duplicated 

 section of the Marais des Cygnes underlying. 



Western and upper coal-bearing division, Winslow. (Arkansas Geol. 

 Sur., Ann. Rept. 1888, Vol. Ill, p. 11, 1888.) Applied to a part of the 

 Cherokee in western Arkansas. 



Westerville limestone, Bain. (Iowa Geol. Sur., Vol. VIII, p. 276, 1898.) 

 A title designating a stratum in the lower part of the Missourian, possibly 

 in the Bethany, in Decatur county, Iowa. 



Weston shales, Keyes. (Amer. Geologist, Vol. XXIII, p. 306, 1899.) A 

 term used locally on the Missouri river for the lower part of the Lawrence. 



Willard shale, Beede. (Trans. Kansas Acad. Sci., Vol. XV, p. 31, 1898.) 

 Part of the middle portion of the Atchison (Wabaunsee) shales, in Shawnee 

 county, Kansas. 



Winterset limestone, White. (Geol. Iowa, Vol. I, p. 246, 1870.) A 

 designation given to the limestones exposed in Madison county, Iowa, that 

 are now regarded as essentially an equivalent of the Bethany. 



Winterset limestone, Bain and Tilton. (Iowa Geol. Sur., Vol. VII, p. 

 512, 1897.) Restricted to the uppermost of the three thin, heavy limestones 

 of the Bethany formation, in central Iowa. 



Wyckoff limestone, Haworth and Kirk. (Kansas Univ. Quart., Vol. II, 

 p. Ill, 1894.) A name used in connection with what is probably a part of 

 the Oread or Plattsmouth limestones. Not defined. 



EXPLANATION OF PLATES. 



Plate vi.—Terranes of the coal measures. The approximate boundaries of the terranes 

 of the coal measures In Iowa, Nebraska, Missouri and Kansas are indicated by the 

 limestone margins. The courses In Kansas were traced chiefly by the geologists of 

 that state.' In Iowa and Missouri the geologists of those states have located the bound- 

 aries. 



Plate vii.— General section of coal measures along the Missouri river. Bethany lime- 

 stone is represented by numbers 1 to 1; the Thayer shales by 6 to 8; lola limestone by 

 9; Parkville shales, 10; Stanton limestone, 11 to 13; Lawrence shales, U to 23; Platts- 

 mouth limestone, 24 to 25; Platte shales, 26; Forbes (Burllngame) limestone, 37; Atchi- 

 son shales, 28 to 34; Cottonwood limestone, 35 to 37. 



