336 CHARLES S. PROSSER 



Thickness Th ™ss 



No. Feet Inches Feet Inches 



next one above 10 inches, which in places splits 



into 2 layers with hackletooth structure at con- 

 tact. The lower layers contain iron pyrite, 



which stains them on weathering. There are 



also calcite crystals, but no fossils were noted 82 41 5 



5. Brassfield limestone.— Crystalline and crinoidal 



light-gray to pinkish limestone, with very ir- 

 regular bedding planes. Specimens of corals 



and Stromatopora are rather common, and 



there is an occasional Brachiopod shell. In 



places there are irregular masses of blue shale 



which contain a good many corals. This is the 



bottom of the quarry at this corner, and the 



barometer with an interval of only 7 minutes 



read the same at the highest outcrop of the 



Brassfield limestone on the northern bank of 



Ludlow Creek, just above the Dayton, Coving- 

 ton, and Piqua traction bridge and Ludlow 



Falls 5 1 33 3 



4. The upper 5 feet of the bank at the northern 



end of Ludlow Falls varies in color from light 



gray to pinkish and greenish, while some of it 



when weathered is brownish. Most of it is 



coarsely crystalline, part of it is very crinoidal, 



and it contains large numbers of Bryozoa, 



corals, and Stromatopora 5 o 28 2 



3. Rather massive, more or less crystalline, lime- 

 stone, which is of light-gray color, somewhat 



brownish as weathered; and some of it is very 



light gray, almost white, and is locally called a 



"marble." It contains very few fossils, if any. 



At the center of the falls there are 1 1 feet of the 



Brassfield limestone undercut by the water of 



the stream 16 6 23 2 



2. Belfast bed. 1 — Blue rock, which is probably 



argillaceous and rather sandy, with layers from 



2 to 6 inches thick and the average about 3 



inches. This zone was thought by Dr. Foerste 



1 The writer understands Dr. Foerste to now refer the Belfast bed to the Rich- 

 mond, which is also the opinion of Dr. E. R. Cumings, based on a study of its 

 Bryozoa. Dr. W. H. Shideler, however, has found certain Brachiopods in the Bel- 

 fast which he thinks allies it with the Brassfield. 



