544 NEW YORK STATE MUSEUM 



torted black, partly glazed, argillaceous shale, which proved to be 

 rich in specimens of C 1 i m a c o g r a p t u s p a r v u S' , but 

 also furnished: 



Diplograptus foliSiceuBj Murchison sp. 



D. angustifollus, Hall 



Climacograptus bicornis, JJci?? ' 



LasiogTaptus mucronatus, Hall sp. 



Corynoides calicularis, Nicholson 



The presence of Climaeograptus parvus, Diplo- 

 graptus a n g u s t i f 1 i u s and L a s i o g r a p t u s m u - 

 <j r o n a t u s places this fauna in the lower Dicellograptus zone. 



CONGLOMERATE BED OF LOWER TRENTON ASPECT IN 



SHALE 



About 150 yards farther up in the nucleus of a small anticline, 

 ^ conglomerate bed with black shales above and below is ex- 

 posed. The exact thickness of the latter could not, on account 

 of the intricate contortions and the resulting swelling up andi 

 thinning out of the bed within a short space, be made out in this 

 place, but the same conglomerate bed, or a very similar one, 

 farther up the creek proved to be about 13 feet thick and was 

 also inclosed on both sides by black shales. The matrix con- 



m 



sists of a dark arenaceous limestone which weathers into a drab 

 sandstone, while the boulders, which are all well worn, consist 

 of small pebbles of reddish or yellowish sandstone, probably of 

 Potsdam and Beekmantown (Calciferous) age, of large boulders 

 (up to 1 foot in diameter) of light blue, hard Lowville (Birdseye) 

 limestone with birdseyes and Tetradium cellulosum. 

 Hall sp. (a typical Lowville limestone fossil), and of still larger 

 boulders (one 2^ feet in diameter) of dark gray Trenton lime- 

 stone. The latter contained : 

 Streptelasma corniculum. Hall 

 Callopora cf. ampla, Ulrich. c 



Plectambonites sericea, Sotoerhy sp. var. aspera, James, cc 

 Strophomena incurvata, 8hepard sp. (-Str. filitexta, Hall) c 

 Hhynchotrema increbescens. Hall, r ; 



