Carho)tife}'oi(s TrilubiteH. 71 



Sr. Ijouis scries of Illinois, Io\v;i juid Missouri, wliicli were i)ro- 

 bjibly formed in a deep quiet sea, thin away to the eiistward in 

 Westmoreland County, Pennsylvania, to 40 feet, and in Somer- 

 set County to 25 feet.' Towards the South, in Virginia, the 

 Lower Carboniferous limestones have a thickness of 822 feet, and 

 even more [in Tennessee. In Georgia these beds hav^e a very 

 limited outcrop, as mere borders of the small coal measures, ex- 

 cept along one line of outliers from which the coal measure 

 strata have been removed.^ In the Arctic i-egions, rocks of the 

 Carboniferous Limestone are exposed on the north coast of Crin- 

 nell Land, in i^'eihlen and Parr}^ Peninsulas, and as far west as 

 Clements-Mark ham Inlet, rising on Mount Julia to a height of 

 2,000 feet, and much higher in the United States Range." 



Waverly. — The Waverly series includes the Chouteau lime- 

 stones. Vermicular sandstones and shales of the Missouri Geolog- 

 ical Survey ; likewise that i)ortion of the so-called Waverly 

 group of Ohio which overlies the Cleveland shale and also the Go- 

 niatite limestones of Indiana. These beds vary in thickness from 

 100 to 200 feet, and contain beds of grit-stone, sandy and argilla- 

 ceous shales, Avith thin layers of oolitic limestone in Illinois. In 

 Michigan, Rominger includes with this series the Huron shales, 

 in the southern part of the Peninsula, and also the Marshall and 

 Napoleon groups.^ 



The Kinderhook group of Illinois contains many fossils which 

 are identical with those of the Waverly, — omitting the Cleveland 

 shales, — and they are equivalent to each other. 



Fossils of this series appear as far west as Lake Valley, I^ew 

 Mexico, and also in Nevada and Arizona. 



BuJtLiNGTOi^ Series. — This group takes its name from its 

 typical locality, Burlington, Iowa. It lies immediately below 

 the Keokuk limestone, and is separated into two beds, by its 

 Hthological characters and its fossils, {a) A lower bed of brown 



1 Geol. Penn. Rep. K2, p. 100. 



2 Little's Catalogue of Ores, Rocks, &c., Georgia, p. 11. 

 -^ Geol. Soc. London, Vol. 1879, p. 560. 



^ Rominger, Geol. Sur. Michigan, Vol. 3, Cliap. viii. 



