CLINTON CROUP. 



Fig. 1 c. A similar trail, with the central depression partially filled with shaly matter. Atff 

 the sides are nearly closed, evidently from the material being soft and moist at the time the 

 impression was made. 



Fig. 1 (/, is a part of a similar trail, larger than the others, and with the fimbriated impres- 

 sions very deep and strong. 



Fig. 2. This trail is similar to the preceding ; but the fimbriee are broader, more distinct and 

 regular, giving it the appearance of a plant or the impression of one. 



Position and locality. These specimens were all, with the exception of 1 c, obtained in the 

 banks of the deep ravine below Tisdale's sawmill in the town of Warren, Herkimer county. 

 These impressions range through a considerable thickness near the centre of the group. 



Fig. 1 c is from Blackstone's quarry, New-Hartford, Oneida county. 



PLATE XIV. Figs. 1, 2, 3. 



Fig. 1 is a specimen like the preceding : it becomes narrower towards one extremity, from 

 the sides of the impression having been partially closed after the animal passed along. 



Figs. 2 & 3 present some peculiar features. At intervals along the trail, the stone is elevated 

 into vesicular knobs with a small opening in the centre. These appear almost like a continuation 

 of the central ridge, which is conspicuous in these specimens. In their form, these knobs appear 

 as if they had been portions of wet arenaceous mud inflated, by air or water, into this form. 



Th" trail >n fig. 2 was apparently made in the direction from c to c'. Other peculiar markings 

 are also visible on the same specimen ; one of these, g, is similar to the fimbriated trails just 

 noticed ; and the others,/!, h, i, are of different character. 



On the specimen fig. 3, there are portions of two trails very conspicuous, and some remains 

 of others. In portions of these two, the fimbriated character is distinctly visible ; and In the 

 continuation of the same trail, the vesicular knobs are also very distinctly preserved. Some 

 portions of the trail are smooth and continuous like those first described. 



These elevated knobs were evidently made afler the animal had passed over that part of the 

 trail, as if, by means of a posterior organ, it had the power of inflating a portion of the wet 

 sand. 



Position and locality. At Blackstone's quarry near New-Hartford, Oneida countj'. 



PLATE XIV. Fig. 4. 



This specimen is a fragment of a large slab, showing the small trails first noticed. These 

 are even more minute than those previously figured ; and from the fact that large surfaces are 

 marked in this way, it would seem that the animls making them were numerous. 



Position and locality. In the red sandstone in the bank of the creek below Tisdale's saw- 

 mill. 



