1 66 NEW YORK STATE MUSEUM 



pounds, my attention was called to the very peculiar and clearly cut 

 pattern on its under surface. As this block must be considered 

 in evidence, it is represented here on plate 7 to snow its upper 

 surface, plate 8 to show a section through upper and under surfaces, 

 and plate 9 to show the under surface. 



During the early summer of 1909 an examination was made of 

 the cave whose arched mouth, rising just above the whitish dried 

 algae band, may be seen a little to the left of the center of plate 

 10. Here a peculiar erosion pattern similar to that on the under 

 side of the limestone block referred to [pi. 9] was discovered 

 but with this difference : on the limestone block the surface was of 

 small area and all the dentlike depressions were confluent ; here the 

 pattern was spread over many square meters of surface and varied 

 in its degree of complexity all the way from the separate circular 

 depressions near the mouth of the cave to the horizontally alined' 

 and crowded. pattern of the deeper recesses. 



Plate 11 is from a photograph of a portion of the north wall of 

 this cave taken August 1909. The depressions are least crowded 

 in the upper right-hand portion of the plate or in that portion of the 

 cave nearest the mouth and under water action for the lesser portion 

 of each year. A distinct horizontal arrangement of these depres- 

 sions is to be noted, and we are compelled to attribute it to the 

 • direction of the flow of water in and out of the cave during wave 

 action, and not to bedding planes. For convenience in reference 

 we shall call this cave Bat cave. 



On visiting the recesses of the cavern with a fallen roof, near 

 the left end of the cliff shown in plate 10, a still more remarkable 

 arrangement of these depressions was discovered. Plate 12 is from 

 a photograph taken October 2, 1909. We are here looking westerly 

 across a higher portion of the inclined cave floor, and the lines 

 taken 'by the confluent depressions are clearly seen to take the 

 natural lines of water discharge. Even, in the vertical fissure shown 

 here the lines are not horizontal and neither would be the direction 

 of the outpouring water as a wave receded. 



Plate 13 is a view which penetrates deeper into the cavern than 

 did plate 12. The vertical fissure at the left of plate 12 is seen at 

 the extreme right of plate 13. In this last plate the relation of 

 these lines of confluent depressions to the direction of water flow is 

 still more striking. An examination of these two plates will also 

 reveal the fact that the sharpest lines of intersections lie deepest 

 within the cave recesses where they are protected from other 



