34 NEW YORK STATE MUSEUM 



quadrangle, are a few feet of beds lithologically more peculiar than 

 any others above the red Potsdam in our Paleozoic section. These 

 are rather argillaceous, lightish (smoky) gray, firm and compact 

 dull limy mudstones (calcilutites or exceedingly fine calcarenites). 

 They weather to vivid tones, light clay-buffs and mud colors, some- 

 times gaily banded or streaked with brown, indicating zones full 

 of rounded quartz grains. The distribution of these sand grains 

 in streaks or winnowings, the curdled (pebbly) or breccialike 

 appearance of certain of the beds, and the irregular bedding dis- 

 continuous horizontally, with the absence of fossils,^ are all remin- 

 iscent of shoal water conditions within a lagoon (barachois) at 

 tide level. The variable nature of the deposits is expressed in the 

 following section : 



Section on west bank of Raquette river at Hewittville lower mills 



Ogdensburg formation 



Ft. In. 



T Coarsely ribboned geodiferous dolomite 3 11 



S Deeply weathered contact; contains fragments of R, 



etc 6* 



Ft In. 



4 5 



Bucks Bridge formation 



(Hewittville beds) 



R Exceedingly fine, flaggy, light gray ("olomarenite; 



weathers to cinnamon o 11 



Q Massy, argillaceous dolomilutite, with small scattered 



pebbles of lighter color o 7i 



P Exceedingh' fine, ribboned, calcarenite, with some 



sand grains and a shale seam o 10 



Exceedingly fine, platy, calcilutite, with scattered 



sand grains; weathers banded o 4J 



N Similar to M but with closer irregular alternations 



■of sandy; surface "slashed" o 9 



M Heavy stratum; more or less breccialike and rib- 

 boned, fine calcarenite and dolomilutite, with man}'^ 



nodules of pinkish calcite; base banded 2 3 



L A dark shaly seam similar to J and H o li 



K Lutite alterniating with very fine do(omarenite con- 

 taining coarser grains; weathers ribboned o 2J 



J Weak, thin-shaly, exceedingly fine dolomarenite o i 



1 Thin-layered coarse calcilutite, ribboned o 2 



H Like J but more variegated; weathers dark o li 



^ A single, small, poorly preserved and dubious gastropod, perhaps a 

 Maclurites, was seen in bed N. 



