526 . KANSAS CITY REVIEW OF SCIENCE. 



6. A few feet of slaty sandstone resting on granite. 



The presence of Lingula lamborni in beds a little above the marble will cer- 

 tainly assign the marble beds to the Potsdam group. - ' 



MARBLES OF NIAGARA GROUP. 



Two miles north of Cape Girardeau, Missouri, on land of Dr. Thomas Hol- 

 combe, are outcrops of variegated purplish red limestone with occasional calcite 

 specks. The beddmg is thick and the marble would look well if pohshed. 



Dr. Shumard in his geological report of Cape Girardeau County, Missouri, 

 Geological Report 1855-71, makes favorable mention of this and other quarries. 

 Dr. S. enumerates one hundred and forty feet of Niagara limestone one mile 

 above Shephard's Landing, the lower eighty-two feet of alternations of purple, 

 yellow, buff and gray with five feet of handsomely variegated limestone in the upper 

 beds. Two miles north of Cape Girardeau his estimate gives 



1. Twenty-six feet of laminated beds of brick red, sandy-textured limestone, 



2. Thirty-two feet of fine-textured, red and purple limestone, clouded with 

 yellow and green and containing Calymene' blumenbachii, Striatopora flexuosa, and 

 Columnaria inequalis. 



3. Thick beds of bluish gray limestone with Halysites Catenularia. 



He also speaks of the marble being found in Section 22, Township 32, 

 Range 13. Similar beds occur in Perry County in east and northeast. 



Dr. S. speaks of its occurrence at Janis' mill in St. Genevieve County, inclin- 

 ing at 80° to 90°, of fine texture and passing through various shades of flesh, yel- 

 low and green, pink, purple and chocolate, all handsomely blended. 



Prof. Albert D. Hager now owns a small tract of land in St. Genevieve 

 County, and is preparing to saw out slabs. Some specimens from this vicinity 

 that I have seen show an exceeding beauty. I have seen also a specimen of 

 dark chocolate color varied by darker wavy lines, all very handsome. 



The chief drawback in working the marbles of southeast Missouri has been 

 the beds generally are too thin to work economically. 



SHELLS OF EUREKA SPRINGS, ARKANSAS. 



BY F. A. SAMPSON. 



During the fall of 1880 and the past summer, I made four visits to this now 

 famous health resort of northwestern Arkansas, and during those visits I spent 

 much -of the time collecting the land and fresh-water shells of the vicinity. The 

 shells of both classes are interesting, either from the rarity of the species, or from 

 their variation and perfection. 



The place takes its name from a large number of mineral springs found with- 

 in a radius of a mile or less ; though all containing more or less mineral, this is 

 not apparent to the taste, and there does not seem to be anything in the water 



