482 TRANS. ST. LOUIS ACAD. SCIENCE. 



Calamites^ Lepidodendron^ Stigmaria^ Annularia^ and Sigil- 

 laria, with probably eight or ten species of ferns, including /Veu- 

 ropteris losckii, N. kirstita^ N. angustifolia^ N. rarinervis^ 

 Sphenopteris tridactylites^ and Alethopteris serlii. The coal 

 is generally 14 to iS inches thick, not separated at Thayer and 

 with no limestone over the coal, but four miles west it is divided 

 by several inches of clay, and a few miles north of this a lime- 

 stone bed appears above the coal. At first a person might sup- 

 pose these coals different, but extended observation proves them 

 to be the same as that at Thayer. No limestone appears above 

 the coal at Thayer. The following is a complete section showing 

 these changes where best developed, seven miles northwest from 

 Thayer. On the hilltop sandstone is exposed, and 30 feet below 

 the strata appear thus : 



1, 2 feet limestone; 



2, 6 feet dark shale, lower part bituminous ; 



3, o to I foot concretionary limestone ; 



4, '10 inches calcareous shale and concretionary limestone; 



5, 3 feet sandy and clay shale ; 



6, 6 inches blue clay shale; 



7, 10 inches coal ; 



8, 4.} inches clay; 



9, 6 inches coal; 



10, 35 feet shales and clay; 



11, 18 inches ferruginous limestone conglomerate ; 



12, 4 feet clay shales. 



In the western part of Missouri, in Cass and Jackson counties, 

 the lower 200 feet of the upper coal measures is well developed 

 and shows abundant evidence of former molluscan life. 



These beds (limestone chiefly, separated by clay and calcareous 

 shale beds) are also readily recognized in Johnson and Wyandotte 

 counties, Kansas. At Eudora the thickness, lithological appear- 

 ance, and organic remains, are correspondingly identical with 

 other beds seen near Parkvilleand on Platte river, Mo., at Union 

 Mills, and at Plattsburgh, Clinton county, and called in Missouri 

 Geological Report, 1872, the Plattsburgh limestone, containing 

 numerous beautiful Bryozoans, Plettrotomania turbiniformis^ 

 Petalodus destructor^ and a beautiful Monoptera^ together with 

 a few species of Nautili. Sixteen feet above this limestone is 

 everywhere found a gray limestone abounding in Syntrilasma 



