SIXTH REPORT OF THE DIRECTOR I909 121 



are fully shown. The contact of the Little Falls dolomite on the 

 Precambric is also shown, but a complete section of the dolomite 

 is nowhere to be found on the north side of the river. The creek 

 section follows, commencing at the base of the Trenton. 



SECTION IN SMALL CREEK AT NORTHWEST EDGE OF LITTLE FALLS 



Feet Inches 



Base of Prasopora simulatrix bed of Trenton 



Hiatus 



20 Brittle dove limestone; normal Lowville 7 n 



19 Basal, less typical Lowville beds ; dove limestone with 

 many rounded quartz grains, in increasing amount 

 downward 3 11 



18 Shaly layers of varying thickness ; base of Lowville ; 



o to 3 



Hiatus 



17 Thin bedded and somewhat shaly layers of dove lime- 

 stone and dove limestone conglomerate, the pebbles 

 of which are embedded in crystalline limestone; 

 considerable pyrite; found two trilobite fragments. 1 6 



16 Thin bedded, hard, brittle, blue dove limestone with 

 shaly partings ; full of stems and plates of cystids 

 and with fewer gastropods (Ophileta le- 

 va t a ) and trilobite fragments in very bad preser- 

 vation 3 6 



15 Two massive beds of bluish, finely granular lime- 

 stone, somewhat mottled with crystalline seams ; 

 rude f ucoidal markings on surface ; contains 

 Pleurotomaria hunterensis 4 8 



14 Similar to above, somewhat less like dove limestone, 

 fine wormlike tracks on surface, upper bed weather- 

 ing finely but unevenly laminar 2 8 



13 Massive, 1 foot to 2 foot beds of dark, blackish gray, 

 firm, hard, fine to medium crystalline dolomite, 

 mottled with black streaks 7 7 



12 Finely granular, gray dolomite, some beds having cal- 

 careous cement and weathering reddish and sandy 

 looking; it is unconformable with the irregular sur- 

 faced layer beneath, whose surface the stream fol- 

 lows for some yards, the slope being greater than 

 the dip of the beds above, so that an additional 6 

 foot thickness comes in; where thickest the basal 



