32 NEW YORK STATE MUSEUM 



2. 20 



20 



Similar to the division above but with the calcareous 

 sandstone much more prominent, so that it forms half 

 of the thickness; the two alternating in divisions which 

 average 5 feet thick. 



Alternating hard, white sandstone, softer, brown- 

 spotted sandstone, gray, calcareous sandstone, and blue, 

 sandy limestone, in part thin-bedded; less sandy than 

 the divisions above; complete section nowhere shows; 

 this division seems to represent the upper half of the 30 

 foot division of thin-bedded material at the base of the 

 Theresa; at least it seems to grade into this when fol- 

 lowed up the river. 



In this section the basal 30 feet of thin-bedded material can not 

 be made out, and the precise horizon of the base determined. But 

 study of the exposures up the river from ^Morristown suggest that 

 division no. i in this section represents the upper half of the 30 foot 

 division, somewhat changed in character and more massive, and 

 that the base of the sections is about 20 feet above the Potsdam. 



Judging from the fossil evidence, the upper part of this section 

 should represent a different formation from the true Theresa, 

 and also a different formation from the Tribes Hill, which directly 

 overlies the Theresa in the Theresa region. It is, however, very 

 like the Theresa lithologically and was classed with it while the 

 field work was in progress. In this section our notion is that the 

 20 feet of beds of no. i would be classed certainly as Theresa ; 

 that beds nos. 2-6 likely belong to this new formation, and that no. 

 7 is perhaps Tribes Hill. The large gastropods which are the 

 characteristic fossils of this new division have been found in beds 

 nos. 3-6, so that really the only doubtful division is no. 2. In this 

 connection it is of interest to note possible evidence of a break at 

 this horizon, shown in a railroad cut one and one-half miles south- 

 east of Morristown. The cut shows a 12 foot thickness of beds 

 belonging apparently to the horizon of division 2 of the Morristown 

 section ; massive calcareous sandstone at the base, followed in turn 

 by white sandstone and by thin-bedded, calcareous sandstone, and 

 capped by coarse, white sandstone. Following around to the north 

 face of the exposure, these beds are seen to be cut out by a mass 

 of coarse conglomerate, full of sandstone pebbles up to 2 inches in 

 diameter (figure 2). In the field we interpreted this as a channel- 

 filling, but, when taken together with the varying thickness of the 



